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Wyszukujesz frazę "mild steel" wg kryterium: Temat


Wyświetlanie 1-9 z 9
Tytuł:
Photochemical screening and corrosion inhibition of Poupartia birrea back extracts as a potential green inhibitor for mild steel in 0.5 M H2SO4 medium
Autorzy:
Louis, H.
Japari, J.
Sadia, A.
Philip, M.
Bamanga, A.
Powiązania:
https://bibliotekanauki.pl/articles/1118151.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Poupartia birrea
corrosion
inhibitor
mild steel
Opis:
Corrosion of metals is a serious environmental problem and has been given much attention in the oil and gas industries. In several industrial processes (acid cleaning and etching, removal of rust and scale), metal surfaces are often made to come in contact with acids. In the present study, an attempt was made to examine Poupartia birrea (P. birres) back extract as a potential green corrosion inhibitor for mild steel in a 0.5 M H2SO4 medium, using the weight loss determination method. The results of our work indicate that highest inhibition efficiency exhibited by Poupartia birrea is 70%. The inhibiting effect of the studied extract could be attributed to the presence of phytochemical constituents present in the extract that are adsorbed on the surface of the mild steel. The plant extract can, hence, be considered as being eco-friendly and an effective green corrosion inhibitor for mild steel exposed to an acid medium.
Źródło:
World News of Natural Sciences; 2017, 10; 95-100
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorption and adsorption isotherm: application to corrosion inhibition studies of mild steel in 2 M HCl
Autorzy:
Abeng, F. E.
Idim, V. D.
Obono, O. E.
Magu, T. O.
Powiązania:
https://bibliotekanauki.pl/articles/1178372.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Adsorption isotherm
inhibition mechanism
mild steel
thermodynamic parameters
Opis:
Ethanollic extract of Phyllanthus amarus (EEPA) was tested as corrosion inhibitor for mild steel in 2 M HCl solution using gravimetric and gasometric methods at 303, 313, 323 K and 333 K. The results revealed that the corrosion rate increases with temperature and time. Addition of the concentration of ethanollic extract of Phyllanthus amarus to the corroding environment lowered the corrosion rate of mild steel and increased inhibition efficiency (IE %) of ethanollic extract. Inhibition efficiency was found to decreased with temperature. Fitting of the experimental data to the Arrhenius and Transition state equations revealed that the Organic constituents of the extract were physically adsorbed on the corroding surface of the steel and adsorption of ethanollic extract of Phyllanthus amarus (EEPA) on mild steel surface was found to obey the Langmuir adsorption isotherm and Freundlich adsorption isotherm and sign of the Gibb’s fee energy of the adsorption obtained suggested that inhibitor molecules have been spontaneously adsorbed onto the mild steel surface. Positive values obtained for enthalpy change indicated that the adsorption of inhibitor is endothermic.
Źródło:
World Scientific News; 2017, 77, 2; 298-313
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigating the extract constituents and corrosion inhibiting ability of Sida acuta leaves
Autorzy:
Adindu Chinonso, B.
Oguzie Emeka, E.
Powiązania:
https://bibliotekanauki.pl/articles/1113826.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Sida acuta
chemical constituents
corrosion
inhibitor
mild steel
Opis:
Constituents of the ethanol extract of Sida acuta (SA) leaves were investigated by phytochemical, GC-MS and FTIR studies and its corrosion inhibition effects on mild steel was studied in 1 M HCl and 0.5 M H2SO4 solutions, using gravimetric and electrochemical methods of corrosion monitoring. The surface morphology of the mild steel surface before and after corrosion was also assessed using SEM imaging. The phytochemical, GC-MS and FTIR results revealed that SA contains carbonyl groups, aromatic rings, and double bonds that make it a prospective corrosion inhibitor for mild steel. Moreover, gravimetric results indicated that SA is an effective additive for the corrosion of mild steel at all the concentrations studied. Finally, the electrochemical results showed that SA inhibited both the anodic and cathodic half reactions by the adsorption of the extract constituents on the mild steel surface; this was further confirmed by the SEM investigations.
Źródło:
World News of Natural Sciences; 2017, 13; 63-81
2543-5426
Pojawia się w:
World News of Natural Sciences
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
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:
Inhibition and adsorption of oil extract of Balanites aegyptiaca seeds on the corrosion of mild steel in hydrochloric acid environment
Autorzy:
Iroha, Nkem B.
Hamilton-Amachree, Akens
Powiązania:
https://bibliotekanauki.pl/articles/1075452.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Balanites aegyptiaca
Mild steel
Temkin adsorption isotherm
corrosion
inhibition
Opis:
The efficiency of oil extract of Balanites aegyptiaca seeds on the inhibition of mild steel corrosion in 1 M HCl has been investigated using gravimetric and electrochemical (Potentiodynamic Polarization (PDP) and Electrochemical Impedance Spectroscopy (EIS)) techniques. Results obtained show that Balanites aegyptiaca (BA) oil extract inhibited the acid corrosion of mild steel. Polarization technique showed that BA oil extract acted as mixed-type inhibitor in 1 M HCl solution. The impedance technique reveals that charge-transfer process controls the corrosion of mild steel. The inhibiting action of BA oil extract was attributed to their adsorption on the mild steel surface and the formation of dense protective layer which increased by increasing their concentration. BA inhibits the corrosion of mild steel by an adsorption mechanism, which follows Temkin adsorption isotherm. Physical adsorption mechanism has been proposed for the inhibitory action of BA oil extract. The protective film formed on the surface was confirmed by scanning electron microscopy (SEM).
Źródło:
World Scientific News; 2019, 126; 183-197
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
BIA, DPA, MBTA and DMA as Vapour Phase Corrosion Inhibitors for Mild Steel under different Atmospheric Conditions
Autorzy:
Kumar, H.
Yadav, V.
Powiązania:
https://bibliotekanauki.pl/articles/412519.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Mild steel
Atmospheric corrosion
vapor phase corrosion inhibitors
Eschke Test
Opis:
Mild steel is widely used as main raw material in fabrication of equipment, chief material of construction and as weapons. During its storage and transportation conditions, it comes in contact with aggressive environment which leads to decrease in mechanical strength and loss in useful properties. Four different vapor phase corrosion inhibitors (VPCIs) i.e. Benzaimidazole (BIA), Diphenyl amine (DPA), 2-mercapto benzothiazole (MBTA) and N,N-dimethyl aniline (DMA) were tested under different atmospheric conditions at 40 °C by Weight Loss, Eschke test, Salt Spray, SO2 test and SEM techniques. All the four VPCIs show good corrosion inhibition efficiency i.e. 65-96 %. The results obtained from all the four corrosion experiments were supported by SEM images.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 1; 52-66
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Composite Barrier to Control the Corrosion of Mild Steel in Oil Well
Autorzy:
Singh, Rajesh Kumar
Thakur, Manjay Kumar
Kumar, Parshun
Powiązania:
https://bibliotekanauki.pl/articles/1030680.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
HCl
Mild steel
Saline water
composite barrier
filler
thermal parameters
Opis:
Mild steel is a very important engineering metal. Petrochemical industries are used bulk amount for their various purposes like recovery of crude oil, refinery units and transportation. Crude oil is a very highly viscous liquid for the opening of the month well strong HCl acid and saline water is used. They produce hostile environment of mild steel. Gaseous substances like CO2 and SO2 gases are found into the well of petroleum. Large amount of saline water are used during recovery of crude oil in this water CO2 and SO2 are dissolved to produce H2CO3 and H2SO4. These acids create an acidic medium of mild steel. Saline waters have possessed Cl¯ ions. It produces ambient environment for mild steel. The solution of salty water contains dissolve oxygen which develop corrosive environment of mild steel. These major corrosive substances are available during recovery of crude oil and they form corrosion cell with base metal. Metal produces galvanic, pitting, stress, crevice, intergranular corrosion. Nanocaoting and filler methods are used to protect metal in such un-friendly environment. The corrosion rate of metal was calculated by weight loss experiment in absence and presence of nanocoating and filler materials. The synthesized organic compound octahydrodibenzo[a,d][8]annulene-5,12-dihydrazone is applied for nanocoating and MgS as filler. The coating and filling works were completed by chemical vapour deposition and nozzle spray method. Potentiostat used for determination corrosion potential and corrosion current density. The surface adsorption was studied by thermal parameters like activation energy, heat of adsorption, free energy, enthalpy and entropy. The thermal parameters results were shown that coating and filler compounds were adhered with base metal by chemical bonding. The thermal results were calculated by Arrhenius equation and Langmuir isotherm. The coating and the filler substance formed composite barrier with metal and developed a protective barrier for the corrosive substances.
Źródło:
World Scientific News; 2020, 139, 2; 155-172
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
DAA, 1-BIZ and 5-ATZ as Vapour Phase Corrosion Inhibitors for Mild Steel under Different Aggressive Atmospheric Conditions at High Temperature
Autorzy:
Saini, V.
Kumar, H.
Powiązania:
https://bibliotekanauki.pl/articles/412195.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Mild Steel
Weight loss test
Eschke test
Salt spray test
Metallurgical research microscopy
SEM
Vapour phase corrosion inhibitors
Opis:
Mild Steel and their products are main raw material for a strong infrastructure for every country which is the main demand in the race of survival, stabilization, growth and competition. Industrialization and modernization in now a days has made a strong demand of steel and their maintenance but atmospheric corrosion can aggressively accelerate the degradation of steel during their manufacturing, processing, storage and transportation. In these cases, traditional methods to prevent corrosion are not suitable which provide the scope of Vapour Phase Corrosion Inhibitors (VPCI) in industries, defense and daily life. Three new VPCI namely Diallylamine (DAA), 1-Benzylimidazole (1-BIZ) and 5-Aminotetrazole (5-ATZ) were tested for mild steel in different aggressive atmospheric conditions by Weight Loss Test, Eschke Test, Salt Spray Test, Sulphur dioxide (SO2) Test at 50 °C and results of these tests were supported by Metallurgical Research Microscopy and Scanning Electron Microscopy (SEM).
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 17, 2; 174-192
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-9 z 9

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