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Tytuł:
Citric Acid as an Eco-Friendly Inhibitor for the EN AW-2024 Aluminum Alloy Corrosion in Acidic Medium
Autorzy:
Kamarska, Kalina
Powiązania:
https://bibliotekanauki.pl/articles/2202340.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
corrosion inhibition
aluminum alloy
citric acid
electrochemical technique
Opis:
The paper presents the results from a study on the possibility to use citric acid as an ecological inhibitor of corrosion in aluminum alloy EN AW-2024 in 0.5 М solution of H2SO4. The study has been carried out by using electrochemical techniques, such as open circuit potential and chronoamperometry. The results reveal that the presence of citric acid in the studied acid medium reduces the corrosion degree of the EN AW-2024 aluminum alloy. The inhibition efficiency increases together with increasing the concentration of the citric acid. The study shows that the citric acid can be used as an ecological inhibitor to fight corrosion in a solution of H2SO4.
Źródło:
Journal of Ecological Engineering; 2023, 24, 1; 307--311
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of the effectiveness of the new inhibitor in different aggressive media
Badanie skuteczności nowego inhibitora w różnych środowiskach o dużej aktywności chemicznej
Autorzy:
Gurbanov, Huseyn R.
Talybov, Gulahmad M.
Adygezalova, Mehpara B.
Zhang, Yu X.
Powiązania:
https://bibliotekanauki.pl/articles/31343889.pdf
Data publikacji:
2023
Wydawca:
Instytut Nafty i Gazu - Państwowy Instytut Badawczy
Tematy:
carbon dioxide
hydrogen sulfide
corrosion
protective effect
inhibitor
pH
reagent
corrosion rate
concentration
dwutlenek węgla
siarkowodór
korozja
działanie ochronne
odczynnik
tempo korozji
stężenie
Opis:
The corrosion protection effect of the new S-1 reagent in media with the pH values of 2.0, 4.0, 6.0, as well as carbon dioxide and hydrogen sulfide added separately and combined to the mentioned media, was first tested under laboratory conditions. The protective effect of reagent S-1 was weak in the corrosion medium without hydrogen sulfide and carbon dioxide. However, as the acidity of the medium and the concentration of the reagent increases, the corrosion protection efficiency of the inhibitor also increases. The highest effect is observed at pH = 2.0 and reagent concentration of 30 mg/l. The corrosion protection effect of the reagent reaches 97% under these conditions. In the media with pH = 4.0 and pH = 6.0 without carbon dioxide and hydrogen sulfide, the protective effect of the inhibitor at the optimal concentration of 30 mg/l is 66% and 64%, respectively. In the medium with added carbon dioxide, the protective effect of inhibitor S-1 decreases at pH = 2.0 and, on the contrary, increases at the values of pH = 4.0 and pH = 6.0. Also, as the pressure of carbon dioxide in the medium increases, the protective effect of inhibitor S-1 increases. When hydrogen sulfide is added to the medium, it causes an increase in the corrosion rate and the protection efficiency of inhibitor S-1. However, in the medium without inhibitor, the increase of hydrogen sulfide concentration only up to CH2S = 400 mg/l is accompanied by an increase in the corrosion rate at all values of pH. The addition of 1000 mg/l of hydrogen sulfide to the corrosion medium leads to the decrease in the corrosion rate in the medium without inhibitors and a slight decrease in the protective effect at the concentration of the inhibitor Cinh = 10 mg/l. As the concentration of inhibitor S-1 increases in the medium with the addition of carbon dioxide and hydrogen, its corrosion protection effect also increases. In the range of Cinh = 10–30 mg/l, when PCO2 = 0.5 atm and CH2S = 200 mg/l, the protective effect is estimated at 38–99%, and when CH2S = 1000 mg/l, it is estimated at 17–79%. At PCO2 = 1.0 atm, the value of protective effect is 22–95% and 14–76%, and finally at PCO2 = 2.0 atm, the value of the corrosion protection effect of inhibitor S-1 is estimated at 44–92% and 15–75%, respectively. The coexistence of carbon dioxide and hydrogen sulfide in an aggressive medium leads to an increase in the protective effect of inhibitor S-1 compared to the medium containing only carbon dioxide, and reduces it in comparison to the medium with hydrogen sulfide. An increase in carbon dioxide pressure in the presence of hydrogen sulfide causes a decrease in the protective effect of inhibitor S-1. The protective effect of inhibitor S-1 is lower in the medium with hydrogen sulfide concentration of 1000 mg/l compared to a concentration of 200 mg/l. This case is also observed in the carbon dioxide free medium.
Działanie antykorozyjne nowego odczynnika S-1 w agresywnych mediach o pH 2,0; 4,0; 6,0, a także dwutlenku węgla i siarkowodoru dodawanych osobno lub łącznie do tych mediów, zostało najpierw zbadane w warunkach laboratoryjnych. Działanie ochronne odczynnika S-1 było słabe w środowisku korozyjnym bez siarkowodoru i dwutlenku węgla. Jednak wraz ze wzrostem kwasowości medium i stężenia odczynnika wzrasta również skuteczność inhibitora w ochronie przed korozją. Najlepsze działanie antykorozyjne odnotowano przy wartości pH = 2,0 i stężeniu odczynnika 30 mg/l. Skuteczność ochronna odczynnika wynosi wówczas 97%. W medium o pH = 4,0 i pH = 6,0 bez dwutlenku węgla i siarkowodoru skuteczność ochronna inhibitora przy optymalnym stężeniu 30 mg/l wynosi odpowiednio 66 i 64%. W medium z dodatkiem dwutlenku węgla działanie ochronne inhibitora S-1 maleje przy wartości pH = 2,0 i odwrotnie wzrasta przy wartościach pH = 4,0 i pH = 6,0. Ponadto, wraz ze wzrostem ciśnienia dwutlenku węgla w środowisku wzrasta skuteczność ochronna inhibitora S-1. Dodanie siarkowodoru do medium powoduje wzrost tempa korozji i skuteczności ochronnej inhibitora S-1. Jednak w medium bez inhibitora wzrostowi stężenia siarkowodoru nawet do tak niskiej wartości jak CH2S = 400 mg/l towarzyszy wzrost tempa korozji przy wszystkich wartościach pH. Dodanie 1000 mg/l siarkowodoru do medium korozyjnego prowadzi do zmniejszenia tempa korozji w medium bez inhibitorów i nieznacznego zmniejszenia działania ochronnego przy stężeniu inhibitora Cinh = 10 mg/l. Wraz ze wzrostem stężenia inhibitora S-1 w medium z dodatkiem dwutlenku węgla i siarkowodoru, zwiększa się również jego działanie antykorozyjne. W zakresie Cinh = 10–30 mg/l, gdy PCO2 = 0,5 atm i CH2S = 200 mg/l, skuteczność ochronną szacuje się na 38–99%, natomiast przy CH2S = 1000 mg/l na 17–79%. Dla PCO2 = 1,0 atm skuteczność ochronna wynosi od 22–95% do 14–76%, a przy PCO2 = 2,0 atm skuteczność antykorozyjną inhibitora S-1 szacuje się odpowiednio na 44–92% i 15–75%. Jednoczesne występowanie dwutlenku węgla i siarkowodoru w agresywnym medium zwiększa skuteczność ochronną inhibitora S-1 w stosunku do medium zawierającego tylko dwutlenek węgla i zmniejsza ją w porównaniu do medium z siarkowodorem. Wzrost ciśnienia dwutlenku węgla w obecności siarkowodoru powoduje zmniejszenie skuteczności ochronnej inhibitora S-1. Ulega ona także zmniejszeniu w środowisku o stężeniu siarkowodoru 1000 mg/l w porównaniu do stężenia 200 mg/l. Ten przypadek obserwuje się również w środowisku bez dodatku dwutlenku węgla.
Źródło:
Nafta-Gaz; 2023, 79, 7; 478-483
0867-8871
Pojawia się w:
Nafta-Gaz
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation on Corrosion Inhibition of Hura Crepitans for 2101 Duplex Stainless Steel in an Acidic Environment
Autorzy:
Temitayo, Ogunmodede O.
Vawe, Humwapwa
Johnson, Jonathan
Adewole, Ezekie
Ilesanmi, Osasona
Powiązania:
https://bibliotekanauki.pl/articles/2201784.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
corrosion
steel
Hura crepitans
inhibitor
sulphuric acid
Opis:
Corrosion is a global menace which has imparted the world economy greatly. One of the solutions proffered to these challenges is the use of inhibitors. Several natural inhibitors have been used to protect engineering materials from corroding. This research is focused on investigating the inhibitive properties of Hura crepitans seed (HCS) on Duplex Stainless Steel 2101 (DSS2101) in H2SO4. The selected plant part was subjected to characterization to determine the presence of organic anti-corrosion agents present. From the result, phytochemicals such as saponin, tannins, steroid and flavonoids were observed. The presence of the organic group accounted for the inhibitive efficiency recorded in the environment. The polarization studies revealed that generally the inhibitor produced from seed extract of Hura crepitans, improved the corrosion resistance of DSS2101 in 0.5M H2SO4. The optimum corrosion inhibitor efficiency was observed at 0.2% inhibitors in 0.5M H2SO4 for 2101DSS.
Źródło:
Advances in Science and Technology. Research Journal; 2022, 16, 4; 56--63
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization and optimization study of Ficus exasperata extract as corrosion inhibitor for mild steel in seawater
Autorzy:
Oyewole, O.
Aondoakaa, E.
Abayomi, T. S.
Ogundipe, S. J.
Oshin, T. A.
Powiązania:
https://bibliotekanauki.pl/articles/1031411.pdf
Data publikacji:
2021
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Corrosion
Ficus exasperata
inhibition efficiency
optimization
weight loss
Opis:
This study investigated the characterization of Ficus exasperata extract and the optimization of the process variables on inhibition of mild steel in seawater environment. Box Behnken Design was employed to examine the influence of three process variables: Temperature: 25-29 °C; Time: 3 – 6 days; Inhibitor concentration: 1-5 v/v. Phytochemical screening of the extract was done. The physicochemical constituents of the seawater were also determined. The experimental data was statistically determined and Scanning Electron Microscope (SEM) was used to characterize the mild steel. The result of the phytochemical screening of the Ficus exasperata plant extract (FEPE) showed the presence of contain inhibitive constituents: alkaloids, tannins, saponins, flavonoids and glycosides. The highest inhibition efficiency of 86.31% at a temperature of 29 ℃ for 6days at an inhibition concentration of 3v/v was observed from the experimental run. The optimal process levels of time: 5.74 days, temperature: 27.95 ℃ and inhibitor concentration: 2.90v/v, gave 87.52% as its inhibition efficiency. The result of the SEM from the optimal process level validated showed that more passive film was formed which can be attributed to the adsorption of the Ficus exasperata extract. It can be concluded that the Ficus exasperata was a good eco-friendly inhibitor.
Źródło:
World Scientific News; 2021, 151; 78-94
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corrosion behavior of Cr-Ni-Mo stainless steel in chemically modified chloride solution
Autorzy:
Zatkalíková, Viera
Markovičová, Lenka
Štrbák, Milan
Powiązania:
https://bibliotekanauki.pl/articles/34670831.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
austenitic stainless steel
pitting corrosion resistance
inorganic inhibitor
stal austenityczna nierdzewna
odporność na korozję wżerową
inhibitor nieorganiczny
Opis:
Cr-Ni-Mo stainless steels are susceptible to the pitting in aggressive chloride environments. One of the possible ways for the influence of their corrosion behavior is the use of inhibitors as the chemical modification of the environment. The resistance of AISI 316Ti stainless steel to the pitting with/without the inorganic inhibitor was tested by two independent corrosion tests: 24-hours exposure immersion and potentiodynamic polarization test. Both tests were carried out in 1M chloride acidic solution with/without 0.1M molybdate inhibitor at room temperature. Results of immersion tests were evaluated by the corrosion rates calculated from corrosion losses and by the morphology of the pitting. Potentiodynamic polarization curves were evaluated by the pitting potentials.
Źródło:
Quality Production Improvement - QPI; 2021, 3, 1; 299-304
2657-8603
Pojawia się w:
Quality Production Improvement - QPI
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deployment of Antepsin (Sucralfate) as Corrosion Inhibitor of Mild Steel in H2SO4 Medium: Chemical and Electrochemical Studies
Autorzy:
Udeh, B. C.
Onukwuli, O. D.
Omotioma, M.
Powiązania:
https://bibliotekanauki.pl/articles/1839460.pdf
Data publikacji:
2021
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Antepsin
Corrosion
H2SO4
Inhibitor
Mild Steel
Opis:
This study presents the deployment of antepsin (sucralfate) as corrosion inhibitor of mild steel in H2SO4 medium. Chemical (gravimetric) and electrochemical (potentiodynamic polarization and electrochemical impedance spectroscopy) techniques were used in the corrosion control investigation. The antepsin drug was characterized by gas chromatography mass spectrophotometer (GCMS) and Fourier transform infrared (FTIR) spectroscopy. Effects of inhibitor concentration, temperature and time on weight loss, corrosion rate, inhibition efficiency and degree of surface coverage were examined. Thermodynamic and adsorption properties of the corrosion inhibition process were determined. Inhibition efficiency was optimized using central composite design tool of Design Expert software version 12. Potentiodynamic polarization and electrochemical impedance spectroscopy were employed to determine the type and effectiveness of the inhibitor. As a confirmatory test, scanning electron microscopy (SEM) was employed to examine the surface morphology of the mild steel samples. Analysis of the results showed that major constituents of antepsin include tetradecanoate, metronidazole, hexadecanoic acid, methyl ester and 11-octadecenoic acid. The predominant functional groups include; C=O stretch, C-H bend and symmetric and asymmetric =C-O-C. Adsorption of the molecules of antepsin on the surface of the mild steel was spontaneous and occurred in agreement with physical adsorption. A quadratic model adequately described the relationship between inhibition efficiency and corrosion control variables of concentration of the inhibitor, temperature and time. Optimum inhibition efficiency of antepsin was obtained as 86.75%. Chemical and electrochemical results agreed that antepsin is suitable for corrosion control of mild steel in H2SO4 solution. Antepsin acted as mixed-type inhibitor (controlled both cathodic and anodic reactions).
Źródło:
World News of Natural Sciences; 2021, 37; 117-134
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization and Optimization study of Epiphyllum oxypetalum extract as corrosion inhibitor for mild steel in 3 M H2SO4 solutions
Autorzy:
Emembolu, L. N.
Onukwuli, O. D.
Okafor, V. N.
Powiązania:
https://bibliotekanauki.pl/articles/1030954.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Acid corrosion
Epiphyllum oxypetalum extract
Optimization
Photochemical
Response Surface Methodology
Opis:
This study investigated characterization of Epiphyllum oxypetalum (EO) leaf extracts and optimization of process variables on inhibition of mild-steel in 3 M H2SO4 aggressive environment. Response Surface Methodology (RSM) was employed to examine the influence of process variables namely acid concentration (1.0 – 3.0 mols), inhibitor concentration (0.2 – 1.0 g/l), time (1–10 hr) and temperature (303 -343K) on inhibition efficiency. The results of phytochemical screening showed that organic components present in EO extract as a good inhibitor. Fourier transform infrared spectroscopy (FTIR) and Scanning electron microscopy (SEM) studies established the presence of active compounds and adsorption of leaf extracts on metal surface. The experimental data was statistically analyzed and regression equations for corrosion rate and inhibition efficiency generated. The optimum conditions were achieved at acid concentration of 1.00 mol, inhibitor concentration of 0.055 g/l temperature of 333K, and time of 2.750 hr. The optimization results revealed that inhibition efficiency of 82.93 % was obtained at optimum combination of the extract concentration, the acid concentration, the temperature and the immersion time. The inhibitive potentials of EO extract was found to impede the localized and uniform corrosion of mild steel in acidic media, showing that the Epiphyllum oxypetalum leaf extract is a good inhibitor for mild steel in acidic solutions.
Źródło:
World Scientific News; 2020, 145; 256-273
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Na3VO4 Inhibitor on the Corrosion Resistance of Al2Cu Intermetallic Phase in H3PO4 Aqueous Solution
Autorzy:
Kwolek, P.
Powiązania:
https://bibliotekanauki.pl/articles/354857.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
intermetallic phase
selective corrosion
orthophosphoric acid
electrochemical impedance spectroscopy
sodium orthovanadate
Opis:
Sodium orthovanadate was tested as a corrosion inhibitor of intermetallic Al2Cu in 1 M H3PO4. The Al2Cu–H3PO4–Na3VO4system was studied using the following methods: inductively coupled plasma optical emission spectrometry, scanning electron microscopy with energy dispersive x-ray spectroscopy, x-ray diffraction, electrochemical impedance spectroscopy, polarisation and open circuit potential. It was found that the corrosion rate decreased as the inhibitor concentration increased. The highest inhibition efficiency 99% was obtained when sodium orthovanadate initial concentration was equal to 100 mM, pH = 1.11, due to precipitation of a protective layer of insoluble salt, containing vanadium, phosphorus, sodium and oxygen, on the surface. At pH = 0.76 the protective layer was not formed and inhibition efficiency decreased to 76%. Selective corrosion of the intermetallic phase caused a significant increase of an electric double layer capacitance and decrease of a charge transfer resistance.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 1; 175-183
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrochemical and Quantum Chemical Investigation on Adsorption of Nifedipine as Corrosion Inhibitor at API 5L X-52 Steel / HCl Acid Interface
Autorzy:
Ikpi, M. E.
Abeng, F. E.
Powiązania:
https://bibliotekanauki.pl/articles/356191.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nifedipine
corrosion inhibition
electrochemical impedance
carbon steel
quantum chemical study
Opis:
Nifedipine, a pyridine derivative was investigated as corrosion inhibitor for API 5L X-52 steel in 2 M HCl solution by potentiodynamic polarization, electrochemical impedance spectroscopy and quantum chemical calculations. Statistical tools were used to compare results of the experimental methods. The results showed that nifedipine is capable of inhibiting the corrosion of API 5L X-52 steel in 2 M HCl solution. Potentiodynamic polarization results reveal that nifedipine functions as a mixed-type inhibitor and presents an inhibition efficiency of about 78% at 500 ppm. Impedance data reveal an increasing charge transfer resistance with increasing inhibitor concentration and also shows comparable inhibition efficiency of about 89-94% at 500 ppm. Thermodynamic parameters imply that nifedipine is adsorbed on the steel surface by a physiochemical process and obeys Langmuir adsorption isotherm. The calculated molecular properties namely the highest occupied molecular orbital energy, lowest unoccupied molecular orbital energy, chemical hardness, energy gap, dipole moment, electronegativity and global nucleophilicity index all show a positive relationship to the observed corrosion inhibition efficiency.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 1; 125-131
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the inhibitory-bactericidal effect of amidoamine-based inorganic complexes against microbiological and atmospheric corrosion
Autorzy:
Aghazada, Y.J.
Abbasov, V.M.
Mursalov, N.I.
Abdullayev, S.E.
Yolchuyeva, U.J.
Powiązania:
https://bibliotekanauki.pl/articles/778541.pdf
Data publikacji:
2020
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
corrosion
inhibitor
bactericide
adsorption
amidoamine
Opis:
In the process, inorganic complexes of amidoamines obtained from the interaction of natural petroleum acid and oleic acids with diethylenetriamine have been developed and their effectiveness as inhibitor-bactericides has been investigated. The effect of the synthesized reagents on the kinetics of the corrosion process of steel and the activity of sulphate-reducing bacteria in 3% NaCl solution saturated with CO2 and in the biphasic water–isopropyl alcohol medium with H2S dissolved has been analyzed. The thermodynamic and kinetic parameters of the corrosion process were calculated. The adsorption of the complexes was investigated using the Langmuir isotherm and the correlation constant was determined. State of the metal surface was investigated by SEM method in CO2 and H2S media, with and without inhibitors, and the metal surface contact of complexes was studied by computer molecular simulation.
Źródło:
Polish Journal of Chemical Technology; 2020, 22, 3; 29-37
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Olej ochronny o niskiej lepkości do czasowej ochrony elementów metalowych przed korozją
Low viscosity protective oil for temporary protection of metal components against corrosion
Autorzy:
Ziółkowska, Monika
Frydrych, Jarosław
Powiązania:
https://bibliotekanauki.pl/articles/1833974.pdf
Data publikacji:
2020
Wydawca:
Instytut Nafty i Gazu - Państwowy Instytut Badawczy
Tematy:
korozja
olej ochronny
czasowa ochrona
lepkość
elementy metalowe
inhibitor korozji
corrosion
protective oil
temporary protection
viscosity
metal components
corrosion inhibitor
Opis:
Corrosion of metals is the gradual destruction of metal under the impact of environmental factors. Chemical or electrochemical processes on the surface of the metal cause irreversible changes in the structure of the metal. To prevent this, during storage or transport, the surfaces of metal elements must be protected against environmental factors, which include: high air humidity, acid rain and variable temperature. These factors accelerate the corrosion process, which cannot be eliminated, but can be reduced by protecting metal elements with e.g. protective oils. Some metals have the ability to passivate, which is a natural protective agent that prevents corrosion. It consists in the formation of an oxide of this metal on the metal surface. Where there is no natural protection against corrosion, protective measures must be used. This paper presents the technology for the production of protective oil for temporary protection against corrosion. The innovation of this project is that the oil will form a thin, well adhering protective layer on the metal surface, which can be easily removed. It is characterised by very low viscosity and low dripping time. It is possible to achieve by using proper base oil with carefully selected anti-corrosion additives. Based on the standard PN-75/C-04154 Petroleum products. Rust protection by metal preservatives the humidity cabinet test method, corrosion tests were carried out. The paper presents the results of a humidity cabinet test for an oil mixture based on deeply refined base oil and properly selected refining additives. The test results confirmed very good anti-corrosive properties of the developed oil due to the use of a corrosion inhibitor and an oxidation inhibitor. The thickness of the protective layer formed on the metal surface was calculated based on a mathematical formula. The resulting layer forms a thin oil film, easy to remove and protecting the metal surface from corrosion.
Źródło:
Nafta-Gaz; 2020, 76, 11; 864--869
0867-8871
Pojawia się w:
Nafta-Gaz
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorption behavior of pharmaceutically active dexketoprofen as sustainable corrosion Inhibitor for API X80 carbon steel in acidic medium
Autorzy:
Nkem, B. Iroha
Abosede, O. James
Powiązania:
https://bibliotekanauki.pl/articles/1076601.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Adsorption
Carbon steel
Dexketoprofen
Inhibition
SEM
Opis:
The inhibition of X80 carbon steel corrosion in 1 M HCl solution by dexketoprofen (DKP) was studied using weight loss (WL), electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP) and scanning electron microscopy (SEM) techniques. The results indicated that DKP acts by way of adsorption as an effective protective inhibitor in the aggressive acid medium. The inhibition efficiency of DKP increased with concentration but was lower at higher temperature. The results of potentiodynamic polarization showed that DKP molecule behaved as a mixed type inhibitor by reducing both the anodic and the cathodic electrochemical reactions. Dexketoprofen was adsorbed on the X80 steel surface in accordance with Langmuir adsorption isotherm. SEM analyses supported formation of protective film on the X80 steel in the presence of DKP.
Źródło:
World News of Natural Sciences; 2019, 27; 22-37
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Innowacyjne inhibitory korozji do strumieni węglowodorowych w kopalniach ropy naftowej i w rafineriach
Innovative corrosion inhibitors for hydrocarbon streams in oilfields and refineries
Autorzy:
Gaździk, Barbara
Kempiński, Roman
Gaździk, Andrzej
Pomykała, Kamil
Powiązania:
https://bibliotekanauki.pl/articles/1835062.pdf
Data publikacji:
2019
Wydawca:
Instytut Nafty i Gazu - Państwowy Instytut Badawczy
Tematy:
ropa naftowa
kopalnia
rafineria
inhibitor
korozja
crude oil
oil well
refinery
corrosion
Opis:
Korozja instalacji podczas procesu wydobycia i przeróbki ropy naftowej stwarza ogromny problem techniczny i ekonomiczny, dlatego stosowane są różne metody ochrony przed korozją, w tym wykorzystywanie inhibitorów korozji. W publikacji opisano przyczyny powstawania korozji oraz przemysłowe metody jej zapobiegania w kopalniach i rafineriach. Przedstawiono metody badań oraz wyniki badań laboratoryjnych inhibitorów korozji opracowanych w ramach projektu: Innowacyjne środki chemiczne z udziałem zmodyfikowanej imidazoliny dla przemysłu rafineryjnego, wydobywczego ropy naftowej, hutniczego i maszynowego, dofinansowanego ze środków Narodowego Centrum Badań i Rozwoju. Badania korozyjne wykonane według NACE 1D182 wykazały, że przy dozowaniu do mieszanki ropa–woda 25 mg/litr inhibitora korozji do dozowania ciągłego do odwiertów i ropociągów Pachem-CWR-1011 szybkość korozji płytek Steel Shimstock obniżyła się z wartości około 1,4 mm/rok do poniżej 0,05 mm/rok, poziom ochrony przed korozją wynosił 96,7%, a rozdział ropy od wody nastąpił w czasie do 15 minut. Badania skłonności do emulgowania według ASTM G 170-06, z udziałem tego inhibitora w ilości 50 mg/litr, wykazały, że do 15 minut zaobserwowano ostry rozdział ropy naftowej od wody. Badania, według NACE 1D182, inhibitora korozji do dozowania okresowego do odwiertów i ropociągów Pachem-CWR-1021 wykazały, że przy jego dozowaniu w I etapie – w celu wytworzenia powłoki ochronnej – w ilości 10 000 mg/litr mieszanki ropa–woda szybkość korozji płytek Steel Shimstock w II etapie obniżyła się do poniżej 0,05 mm/rok, a stopień ochrony przed korozją wynosił 98,60%. Po badaniu do 15 minut zaobserwowano wyraźny rozdział ropy naftowej od wody. Badania grubości warstwy wykazały, że Pachem-CWR-1021 tworzy powłokę ochronną o grubości około 20 mikrometrów. Przeprowadzono badania inhibitora Pachem-CR-1012 do dozowania w sposób ciągły do rur oparowych i orosień kolumn destylacyjnych w celu ochrony przed korozją kolumn destylacyjnych, układów kondensacyjnych i rurociągów na instalacji destylacji ruro- wo-wieżowej DRW. Badania według NACE 1D182 wykazały, że inhibitor przy dozowaniu 15 mg/litr benzyny ogranicza szybkość korozji z poziomu około 2 mm/rok do poniżej 0,01 mm/rok, a stopień ochrony przed korozją wynosi 99,8%. Inhibitor znakomicie przeciwdziała tworzeniu się emulsji – po badaniu uzyskano niezawodnioną, pozbawioną produktów korozji benzynę surową i czystą, pozbawioną węglowodorów wodę kondensacyjną.
Corrosion of installations during the process of oil production and processing creates a huge technical and economic problem, which is why various methods of corrosion protection are applied, including the use of corrosion inhibitors. The paper describes the causes of corrosion and industrial methods of its prevention in oilfields and refineries. The research methods and laboratory test results of corrosion inhibitors developed as part of the Project: Innovative chemicals with modified imidazoline for the refinery, oilfields, metallurgy and machinery industries, co-financed by the National Center for Research and Development. Corrosion tests (NACE 1D182) have shown that dosing the Pachem-CWR-1011 corrosion inhibitor for continuous injection to wells and pipelines to an oil/water mixture at 25 mg/liter, decreased the corrosion rate of Steel Shimstock plates from ca 1.4 mm/year to below 0.05 mm/year, and corrosion protection was 96.7%. Emulsification tendency evaluation (ASTM G 170-06) showed a sharp separation of crude oil and water phases within up to 15 minutes when 50 mg/liter of this inhibitor was used. Tests of the Pachem-CWR-1021 corrosion inhibitor for periodical injection to wells and pipelines showed that the rate of corrosion of Steel Shimstock plates, in the second stage, decreased to a level below 0.05 mm/year, and the degree of corrosion protection was 98.60% when a treat rate of 10,000 mg/liter of oil-water mixture was used in the first stage to produce a protective coating. After the tests, a clear separation of oil and water was observed within up to 15 minutes. The film layer thickness measurements showed that Pachem-CWR-1021 forms a protective film with a thickness of about 20 micrometers. Corrosion inhibitor PachemCR-1012 for continuous dosing into the vapor pipes and refractory distillation columns to protect against corrosion of the installation on the CDU plant was also tested. The NACE 1D182 tests have shown that the inhibitor, dosed at the rate of 15 mg/liter of gasoline reduces the corrosion rate from 2 mm/year to below 0.01 mm/year, and the degree of corrosion protection is 99.8%. The inhibitor is excellent in protecting against the formation of emulsions – after the test, a non-watery crude oil free corrosion products and clear condensation water free of hydrocarbons were obtained.
Źródło:
Nafta-Gaz; 2019, 75, 6; 356-372
0867-8871
Pojawia się w:
Nafta-Gaz
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of Chrysophyllum albidum leaf extract as corrosion inhibitor for aluminium in 0.5 M H2SO4
Autorzy:
Ezeugo, J. O.
Onukwuli, O. D.
Ikebudu, K. O.
Ezechukwu, V. C.
Nwaeto, L. O.
Powiązania:
https://bibliotekanauki.pl/articles/1075618.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Aluminium
Chrysophyllum albidum
corrosion
electrochemical
optimal
Opis:
Inhibition of Chrysophyllum albidum leave (CAL) extract toward 0.5 M H2SO4 corrosion of aluminium was optimized applying response surface methodology. Corrosion analysis was carried out using weight loss and electrochemical techniques. The results of the various analyses of the leave extracts acted as a good corrosion inhibitor for aluminium in 0.5 M H2SO4. Inhibition efficiency increases as the extract concentration increased. Results of molecular dynamic simulations of the active constituents of the extracts confirmed the adsorption potentials of the ethanol extracts of CAL. Optimal inhibition efficiency of 78.43(%) was obtained at optimum inhibitor concentration of 1.00 g/l, 11.71hs and temperature of 303.60k
Źródło:
World Scientific News; 2019, 125; 32-50
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Green corrosion inhibitor for mild steel in 2 M HCl solution: Flavonoid extract of Erigeron floribundus
Autorzy:
Abeng, Fidelis Ebunta
Idim, Veronica David
Powiązania:
https://bibliotekanauki.pl/articles/1177856.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Erigeron floribundus
Flavonoid
Green inhibitor
corrosion
mild steel
Opis:
The potential of flavonoid extract of Erigeron floribundus as green inhibitor for the corrosion of mild steel in 2 M HCl solution was studied using gasometric method. The results obtained, indicated that the extract is an adsorption inhibitor for the corrosion of mild steel. The inhibition efficiency of the inhibitor was found to increased with increase in concentration of the inhibitor. From the observed trend for the variation of inhibition efficiency with temperature and the range of value obtained from activation energy (16.16-3.02 KJmol-1), enthalpy (13.5-38.84 KJmol-1), entropy (-22.67 to 88.44 KJmol-1) and free energy (-4.23 to -2.61 KJmol-1), a chemical and physical adsorption mechanism is propose for the adsorption of the inhibitor on the mild steel surface. In addition, the adsorption is endothermic, spontaneous and is best described by Langmuir adsorption isotherm.
Źródło:
World Scientific News; 2018, 98; 89-99
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 33

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