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Tytuł:
Effect of intermetallic phases on corrosion behavior and mechanical properties of duplex stainless steel and super-duplex stainless steel
Autorzy:
Paulraj, P
Garg, R.
Powiązania:
https://bibliotekanauki.pl/articles/102625.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
stainless steel
intermetallic phases
corrosion
mechanical properties
welding
Opis:
Duplex Stainless Steels (DSS) and Super Duplex Stainless Steel (SDSS) have excellent integration of mechanical and corrosion properties. However, the formation of intermetallic phases is a major problem in their usage. The mechanical and corrosion properties are deteriorated due to the presence of intermetallic phases. These phases are induced during welding, prolonged exposure to high temperatures, and improper heat treatments. The main emphasis of this review article is on intermetallic phases and their effects on corrosion and mechanical properties. First the effect of various alloying elements on DSS and SDSS has been discussed followed by formation of various intermetallic phases. The intermetallic phases affect impact toughness and corrosion resistance significantly. Their deleterious effect on weldments has also been reviewed.
Źródło:
Advances in Science and Technology. Research Journal; 2015, 9, 27; 87-105
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of corrosive coated coatings multi-groove hardfacing on stainless steel
Autorzy:
Woźniak, P.
Powiązania:
https://bibliotekanauki.pl/articles/247869.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
corrosion
hardfacing
MIG
Taguchi method
seawater
Opis:
Using the pad welding technique it is possible to regenerate machine parts or improve surface properties such as abrasion, corrosion and aging resistance. To ensure optimum processing conditions and economic efforts should be made, while providing a high deposition efficiency for the small amount of metal in the pad weld substrate. The pad welding process for the test subject should be carried out by preheating to evaporate the moisture and reduce the porosity of the weld. This treatment is required depending on the carbon equivalent. The article presents the results of corrosion tests of multi-groove pads made with the MIG method on a steel substrate. The samples were made of C45E steel. The additional material was a wire made of stainless steel with the factory name CASTOMAG 4554S. The results of previously performed tests allowed determining the optimal process parameters at which we obtain the smallest share of the base material in the padding. Steel samples were prepared and preheated to 300ºC. The hardfacing process was carried out with constant parameters, i.e. current intensity, arc voltage, surfacing speed). Two protective gases were used to apply the additional material: CO2 and argon. The samples were subjected to corrosion tests in two environments (3.5% sodium chloride solution and 0.001 sulfuric acid solution). The assessment of corrosive properties was made on the basis of constant current measurements (potentiodynamic method). The influence of shielding gas on corrosion properties was demonstrated based on the tests.
Źródło:
Journal of KONES; 2018, 25, 3; 511-516
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of SO3-Ph-BTBP on stainless steel corrosion in nitric acid
Autorzy:
Wilbraham, R. J.
Boxall, C.
Powiązania:
https://bibliotekanauki.pl/articles/147906.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
corrosion
stainless steel
electrochemistry
6,6'-bis(1,2,4-triazin-3-yl)-2,2'-bipyridine
Opis:
SO3-Ph-BTBP is a hydrophilic tetra-N-dentate ligand proposed for An(III)/Ln(III) separation by solvent extraction, and a candidate for use in future advanced reprocessing schemes such as GANEX and SANEX. We present the first study of the effect of SO3-Ph-BTBP on the corrosion behavior of stainless steels. Specifically, studies have been performed using steels and conditions equivalent to those found in relevant nuclear reprocessing flow sheets. SO3-Ph-BTBP has been shown to have little effect on either steel passivation or reductive dissolution. However, if driven cathodically into a region of hydrogen evolution at the electrode surface or conversely anodically into a region of transpassive dissolution, observed currents are reduced in the presence of SO3-Ph-BTBP, suggesting corrosion inhibition of the steel potentially through weak absorption of a SO3-Ph- -BTBP layer at the metal-solution interface. The lack of any observed corrosion acceleration via complexation of Fe3+ is surprising and has been suggested to be due to the slow extraction kinetics of SO3-Ph-BTBP as a result of a requirement for a trans- to cis-conformational change before binding.
Źródło:
Nukleonika; 2015, 60, No. 4, part 2; 865-869
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of surface modification on corrosion resistance of AISI 440B martensitic stainless steel
Autorzy:
Łępicka, M.
Grądzka-Dahlke, M.
Powiązania:
https://bibliotekanauki.pl/articles/284892.pdf
Data publikacji:
2014
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
martensitic stainless steel
surface
corrosion
Źródło:
Engineering of Biomaterials; 2014, 17, no. 128-129; 114-115 [wklejka]
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corrosion of AlSi 304L Austenitic Stainless Steel in Non-Stationary Aqueous HCl + NaCl Solution
Autorzy:
Opiekun, Z. A.
Orłowicz, A. W.
Kupiec, B.
Powiązania:
https://bibliotekanauki.pl/articles/383327.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
austenitic stainless steel
structures
hardness
microhardness
stress
corrosion
stal austenityczna
struktury
twardość
mikrotwardość
naprężenie
korozja
Opis:
The paper describes the process of stress corrosion in a Ø50 mm rod made of AISI 304L austenitic chromium-nickel steel. Discs cut off from the steel rod were moved at a speed of 1.25 m/s for a test period of 408 h in a corrosive environment of aqueous solution containing 3% HCl and 8.6 g NaCl at room temperature. It was found that deepest cracks and irregular pitting occurred locally in areas of microstructure containing grains of hard lamellar &alpha' martensite and along boundaries between filamentary delta ferrite (Feδ) precipitates and &alpha′ phase. The corrosion developed in a trans-crystalline manner with branches propagating along boundaries of lamellar &alpha′ phase grains.
Źródło:
Archives of Foundry Engineering; 2014, 14, 1 spec.; 165-168
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of plasma nitriding process conditions on corrosion resistance of 440B martensitic stainless steel
Autorzy:
Łępicka, M.
Dahlke, M.
Powiązania:
https://bibliotekanauki.pl/articles/386879.pdf
Data publikacji:
2014
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
stainless steels
corrosion
surface modification techniques
plasma nitriding
surgical instruments
stal nierdzewna
korozja
modyfikacja powierzchni
azotowanie plazmowe
narzędzia chirurgiczne
Opis:
Martensitic stainless steels are used in a large number of various industrial applications, e.g. molds for plastic injections and glass moldings, automotive components, cutting tools, surgical and dental instruments. The improvement of their tribological and corrosion properties is a problem of high interest especially in medical applications, where patient safety becomes a priority. The paper covers findings from plasma nitrided AISI 440B (PN-EN or DIN X90CrMoV18) stainless steel corrosion resistance studies. Conventionally heat treated and plasma nitrided in N2:H2 reaction gas mixture (50:50, 65:35 and 80:20, respectively) in two different temperature ranges (380 or 450°C) specimens groups were examined. Microscopic observations and electrochemical corrosion tests were performed using a variety of analytical techniques. As obtained findings show, plasma nitriding of AISI 440B stainless steel, regardless of the process temperature, results in reduction of corrosion current density. Nevertheless, applying thermo-chemical process which requires exceeding temperature of about 400°C is not recommended due to increased risk of steel sensitization to intergranular and stress corrosion. According to the results, material ion nitrided in 450°C underwent leaching corrosion processes, which led to significant disproportion in chemical composition of the corroded and corrosion-free areas. The authors suggest further research into corrosion process of plasma nitrided materials and its degradation products.
Źródło:
Acta Mechanica et Automatica; 2014, 8, 3; 156-159
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface modification ofaisi440b stainless steel and its influence on surgical drill bits performance
Autorzy:
Łępicka, M.
Grądzka-Dahlke, M.
Powiązania:
https://bibliotekanauki.pl/articles/350989.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
surgical drill bits
corrosion
wear
DLC
TiN
Opis:
The development of modern invasive surgery is highly dependent on the performance of surgical instruments, understood as long-term efficiency arising from high resistance to wear and corrosion. In order to maintain sufficient reliability, surgical cutting instruments are often made of martensitic stainless steels. Nevertheless, the use of ferrous alloys in medical applications is still a concern due to their questionable corrosion and wear resistance. To extend their bioconipatibility, improve stability in variable environmental conditions, improve ease of handling, and maximize their performance, diffusion layers and coatings are applied to the surface. The aim of this work was to evaluate the effect of TiN and diamond-like carbon (DLC) surface modification on the performance of surgical drill bits, that is. wear and corrosion resistance, measured in model and field tests. Based on the findings presented, DLC layers can be recommended as anti-wear and anti-corrosion coatings for surgical drill bits.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 3; 1417-1424
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of heat treatment and plasma nitriding on corrosion resistance of 440B martensitic stainless steel
Autorzy:
Łępicka, M.
Grądzka-Dahlke, M.
Powiązania:
https://bibliotekanauki.pl/articles/386313.pdf
Data publikacji:
2013
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
stainless steels
corrosion
heat treatment
plasma nitriding
surgical instruments
stal nierdzewna
korozja
obróbka termiczna
azotowanie jarzeniowe
narzędzia chirurgiczne
Opis:
Reliability and durability assurance poses a serious challenge for surgical instruments manufacturers. Hard working conditions, such as intermittent contact with body fluids and hard bone tissues, as well as necessity to undergo frequent sterilisation processes, induce constant research into solutions capable of ensuring high wear resistance while maintaining satisfactory imperviousness to corrosion. Plasma nitriding is marked as the modern corrosion resistance improving method suitable for surgical instruments steels. The paper pre-sents findings from the heat treated and plasma nitrided AISI 440B (PN EN or DIN X90CrMoV18) steel corrosion resistance studies. Three conventionally heat treated (quenched with tempering in 250, 390 or 605°C) and three additionally plasma nitrided in N2:H2 reaction gas mixture (50:50, 35:65 and 20:80 ratio, respectively) specimens groups were examined. Furthermore, the authors evaluated the effect of machining - polishing and sandblasting - on investigated steel corrosion resistance. Microscopic observations and electrochemical corrosion tests were performed using a variety of analytical techniques. Results showed that, in comparison to conventional heat treatment, plasma nitriding of 440B stainless steel does not significantly affect its corrosive characteristics as far as the uniform nitride layer over the entire detail surface is obtained. The layer heterogeneity results in intensification of corrosion processes, making the material even more susceptible to corrosion than after conventional heat treatment, and contributing to severe, visible even with the unaided eye damages development.
Źródło:
Acta Mechanica et Automatica; 2013, 7, 3; 155-159
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
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:
Corrosion Reactivity in the Pre-Clinical Study of 316L and 321 Stainless Steel for Dentistry Applications
Autorzy:
Neaga, V.
Benea, Lidia
Powiązania:
https://bibliotekanauki.pl/articles/2048753.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
corrosion
electrochemical methods
stainless steel
human saliva
Opis:
Now, the use of any medical device based on metals or alloys, especially intended for dentistry applications, is impossible without preclinical evaluation of its anticorrosion properties. Today, the use of stainless steels with AISI standardization, with predilection 316L and 321, are preferred for ergonomic reasons due to their high operational reliability and optimal mechanical properties for functionality over time. In this regard, 316L and 321 stainless steels are tested for comparison in the solution that simulates human saliva with different pH. Stainless steel samples were subjected to corrosion in Fusayama-Meyer and Carter-Brugirard saliva. In-situ electrochemical measurements were applied, such as the open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS). The results show that the corrosion resistance of 316L is superior to 321 in saliva solution at both pH values.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 1; 371-376
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of corrosion rate of X55CrMo14 stainless steel at 65% nitrate acid at 348 K
Autorzy:
Lipiński, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/1839535.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
stal
stal nierdzewna
korozja
szybkość korozji
profil chropowatości
steel
stainless steel
corrosion
corrosion rate
profile roughness
Opis:
A number of factors determine the mechanical, but also physical and chemical properties. One of the most important are the steel microstructure and its working conditions. A few corrosion processes in crevices and awkward corners can be avoided at the design stage (low roughness parameters, roundsection and other). But still the construction material is exposed to corrosion. These steels often come into contact with an aggressive environment based on nitric acid. Stainless steel is more and more often used in many sectors of industry. The purpose of this article is to investigate corrosion resistance in different time (48, 96, 144, 192, 240, 288, 336, 384 and 432 hours) using weight loss and profile roughness parameters of martensitic steel in grade X55CrMo14 in nitric acid 65% pure-basic at temperature 348 K. Corrosion tests show that the tested steel in nitric acid as a corrosive environments is characterized through continuous corrosion process whose measure may be surface roughness.
Źródło:
Production Engineering Archives; 2021, 27, 2; 108-111
2353-5156
2353-7779
Pojawia się w:
Production Engineering Archives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corrosion Resistance of Some Stainless Steels in Chloride Solutions
Autorzy:
Kasprzyk, D.
Stypuła, B.
Powiązania:
https://bibliotekanauki.pl/articles/352719.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stainless steel
chemical composition
corrosion
Ringer solution
Opis:
The present work compares corrosion behaviour of four types of S30403, S31603, S32615 austenitic and S32404 austeniticferritic stainless steels in chloride solutions (1%, 3% NaCl) and in Ringer solution, at 37°C temperature. Corrosion resistance was determined by potentiodynamic polarization measurements and a thirty day immersion test conducted in Ringer solution. The immersion test was performed in term of biomedical application. These alloy were spontaneously passivated in all electrolytes, wherein S30403, S31603 and S32404 undergo pitting corrosion. Only S32615 containing 5.5% Si shows resistance to pitting corrosion.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 711-714
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Aging Time at 850°C on Microstructure and Corrosion Resistance of a Cold Rolled 2205 Duplex Stainless Steel
Autorzy:
Assumpção, Raphael França
Fortes Monteiro, Jessica C.
Campideli, Victor Cardoso
Santos, Dagoberto
Sicupira, Dalila C.
Powiązania:
https://bibliotekanauki.pl/articles/28099590.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
duplex stainless steel
aging
corrosion
secondary phases
self-healing
Opis:
The effect of aging time at 850°C for 300 s, 600 s, 1800 s, and 84600 s on the microstructural evolution and corrosion resistance of 2205 duplex stainless steel (DSS) was studied after cold rolling up to 60% of reduction. X-ray diffraction, scanning electron and transmission electron microscopy were used for microstructural characterization. The corrosion behavior was studied by cyclic potentiodynamic polarization (CPP) and electrochemical impedance technique (EIS) in 3.5% NaCl solution and the susceptibility to sensitization was investigated through the double loop electrochemical potentiodynamic reactivation (DL-EPR) test in 0.5 M H2SO4 + 0.1 M NaCl + 0.002 M KSCN solution. After cold working, increasing aging time led to an increase in sigma phase precipitation and a decrease in pitting corrosion resistance. However, the ultrafine microstructure had a beneficial influence on the self-healing effect in Cr and Mo depleted areas with the increasing of aging time, resulting in higher passivation ability. The DSS 2205 type was not susceptible to intergranular corrosion for the aged conditions applied.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 2; 681--688
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of plastic deformation on electrochemical properties of X5CrNi18-10 steel
Autorzy:
Rejmer, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/1835573.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
corrosion
electrochemistry
stainless steel
impendance spectroscopy
Tafel plots
Opis:
The purpose of this study was to determine the effect of plastic deformation on the electrochemical properties of X5CrNi18-10 steel. The tested material belongs to the group of stainless steels with low carbon content, and it is used in many industries due to its high corrosion resistance. In most applications of the tested material, it is formed into complicated shapes and exposed to aggressive environments. Examples include the applications in medicine (implants) as well as in civil engineering and nuclear power plants. Different effects of deformation on anti-corrosion properties have been described in the literature. Samples with 5 different deformations were obtained in the present experiment. Electrochemical direct electrical current and alternating electrical current tests were performed for the obtained materials. The tests were carried out in a 1 molar sodium chloride solution. The study revealed an increase in the corrosion resistance of samples with increasing strain in the tested strain ranges.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2020, nr 23(3); 253-262
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corrosion of AISI 304L (EN 1.4307) stainless steel in animal slurry
Korozja stali AISI 304L (EN 1.4307) w gnojowicy
Autorzy:
Rokosz, K.
Chojnacki, J.
Hryniewicz, T.
Zbytek, Z.
Powiązania:
https://bibliotekanauki.pl/articles/337559.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
Tematy:
corrosion
stainless steel
animal slurry
korozja
stal
odporność
gnojowica
Opis:
The stainless steels are used to build parts of machinery for agriculture. These components should have adequate corrosion resistance because they contact with aggressive environments, such as natural and artificial fertilizers, or e.g. during the biogas production. In such environments austenitic AISI 304L (EN 1.4301) and AISI 316L (EN 1.4571) stainless steels are mostly used. In the available literature authors found no information on the corrosion potentiodynamic tests in manure. That was the reason to undertake the studies on one of the austenitic stainless steels to perform corrosion tests in the environment of animal slurry. The article presents the analysis of general and pitting corrosion of AISI 304L (EN 1.4307) steel in the environment which is the cattle slurry. Potentiodynamic measurements were made on the potentiostat ATLAS 98 with a scan rate of 0.1 mV∙s-1 in the anodic direction and with scan rate of 1 mV∙s-1 in the return cathodic direction. The measurement was started in the anodic direction from potential of minus 600 mV against the saturated calomel electrode (SCE) to achieve a current density of 1000 μA∙cm-2. After that the cathodic scan was done back to the potential of -600 mV vs. SCE. The general corrosion in animal slurry is higher than in 3% water solution of sodium chloride. The corrosion potential measured in the animal slurry was equal to -525 mV vs. SCE. That clearly indicates a higher tendency to general corrosion in comparison with the results obtained in 3% sodium chloride solution (-200 mV vs. SCE). The passive current density ratio measured in the animal slurry to that one in 3% NaCl aqueous solution is equal approximately 8.5.
Maszyny oraz urządzenia używane w rolnictwie budowane są najczęściej z elementów stalowych. Takie komponenty są narażone na korozję ze względu na to, że pracują w środowiskach korozyjnie agresywnych, takich jak nawozy sztuczne, czy też naturalne, jak i w produkcji biogazu. Najczęściej używanymi austenitycznymi stalami stopowymi są AISI 304 (EN 1.4301) oraz AISI 316Ti (EN 1.4571). W dostępnej literaturze autorzy nie znaleźli informacji na temat badań potencjodynamicznych w gnojowicy, czego wynikiem jest przedstawione opracowanie. W artykule przedstawiono analizę korozji ogólnej i wżerowej stali AISI 304L (EN 1.4307) w środowisku jakim jest gnojowica bydlęca. Pomiary polaryzacyjne wykonano na potencjostacie ATLAS 98 z szybkością skanowania 0.1 m V∙s-1 w kierunku anodowym oraz 1 m V∙s-1 w przypadku skanu powrotnego w kierunku katodowym. Pomiar rozpoczęto w kierunku anodowym od potencjału -600 mV względem nasyconej elektrody kalomelowej (NEK) do osiągnięcia gęstości prądu 1000 μA∙cm-2, po czym następował pomiar w stronę katodową do potencjału -600 mV względem NEK. Jako elektrody prądowej użyto elektrodę platynową EPtP-301 oraz elektrody odniesienia NEK: EK 101 (0,244 V w temperaturze 25°C). Pomiary SEM/EDX przeprowadzono w Hochschule Wismar (Niemcy) na FEI Quanta 250 FEG z EDS-System NS7 oraz QuasOr EBSD-System. Chropowatość powierzchni oraz wżery były przedmiotem studiów na Taylor-Hobson Precision Talysurf CCI 6000 w Katedrze Mechaniki Precyzyjnej na Wydziale Mechanicznym Politechniki Koszalińskiej. Wyniki wykazały, że gnojowica bydlęca jest środowiskiem bardziej agresywnym niż 3% wodny roztwór chlorku sodu ze względu na potencjał korozji oraz prąd pasywacji. Potencjał korozji stali AISI 304L (EN 1.4307) w gnojowicy wskazywał na większą tendencję powierzchni do korozji (Ecorr = -525 mV vs. NEK) niż w 3% wodnym roztworze NaCl (Ecorr = -200 mV vs. NEK). Różnice są również widoczne w prądach pasywacji dla Ecorr = 0 mV vs. NEK. Stosunek prądu pasywacji w gnojowicy do tego w 3% NaCl wynosi około 8,5. W przypadku korozji wżerowej zauważono odwrotną sytuację, to znaczy lepszą odporność na korozję wżerową w gnojowicy niż w roztworze 3% NaCl. Można to wstępnie tłumaczyć zaklejeniem powierzchni stali przez cząstki stałe gnojowicy, co będzie również podstawą dalszych badań.
Źródło:
Journal of Research and Applications in Agricultural Engineering; 2014, 59, 1; 104-108
1642-686X
2719-423X
Pojawia się w:
Journal of Research and Applications in Agricultural Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 26

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