Green chemistry for stainless steel corrosion resistance: life cycle assessment of citric acid versus nitric acid passivation

Ferritic stainless steels exhibit properties, such as good electrical conductivity, good corrosion resistance and low cost, that are beneficial for their application as interconnects in intermediate temperature solid oxide fuel cells (ITSOFC) that function at temperatures between 600°C and 800°C. However, the stainless steel corrosion resistance is attributed to the amount of Cr, which is an element that forms a chromium oxide (Cr2O3) layer, acts as an oxidation protective barrier at high temperatures, and reduces the interconnector performance due to its low electrical conductivity. In this context, the objective of this work was to obtain spinel coatings from the Fe and Ni metallic alloy thermal conversion on AISI stainless steel 430 substrate produced by electrodeposition. The morphology and microstructure of the spinel films deposited on stainless steel were characterized by SEM, EDS, XRD and adherence analysis. The results obtained showed that the films were adherent, dense and continuous along the AISI stainless steel 430 substrate surface. In addition, the heat treatment procedure effectively produced crystalline spinels ((NiFe)3O4).

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Evaluation of 316L Stainless Steel Corrosion Resistance in Solution Simulating the Acid Hydrolysis of Biomass

Journal of The Electrochemical Society ◽

10.1149/1.3554728 ◽

2011 ◽

Vol 158 (4) ◽

pp. C95 ◽

Cited By ~ 1

Author(s):

E. A. Ferreira ◽

R. D. Noce ◽

C. S. Fugivara ◽

A. V. Benedetti

Keyword(s):

Stainless Steel ◽

Corrosion Resistance ◽

Acid Hydrolysis ◽

316L Stainless Steel ◽

Steel Corrosion ◽

Steel Corrosion Resistance ◽

Hydrolysis Of

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EFFECT OF HEAT TREATMENT AND PLASMA NITRIDING ON CORROSION RESISTANCE OF 440B MARTENSITIC STAINLESS STEEL

Acta Mechanica et Automatica ◽

10.2478/ama-2013-0026 ◽

2013 ◽

Vol 7 (3) ◽

pp. 155-159 ◽

Cited By ~ 1

Author(s):

Magdalena Łępicka ◽

Małgorzata Grądzka-Dahlke

Keyword(s):

Heat Treatment ◽

Stainless Steel ◽

Corrosion Resistance ◽

Plasma Nitriding ◽

Steel Corrosion ◽

Surgical Instruments ◽

High Wear Resistance ◽

Heat Treated ◽

Conventional Heat Treatment ◽

Steel Corrosion Resistance

Abstract 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 presents 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.

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