Effects of Cu on the passive film stability of Fe-20Cr-xCu (x=0, 2,4 wt.%) alloys in H2SO4 solution

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Effects of Cu on the stability of passive film formed on Fe-20Cr-xCu (x = 0, 2, 4wt.%) alloys in deaerated 0.1 M H2SO4 solution were examined by potential decay test, X-ray photoelectron spectroscopy, and the Mott-Schottky analysis. The potential decay curves of Fe-20Cr-xCu (x = 0, 2, 4wt.%) alloys passivated for 1 h at 400 mV(SCE) exhibited a 1st stage-potential decay to a potential of approximately -300 mV(SCE). Especially, the stability of passive film decreased with an increase in Cu content, suggesting that the film formed on the Cu-containing alloys was less stable than that of Fe-20Cr alloy. The rapid potential decrease in the Cu-containing alloys was primarily due to the Cu-dissolution from the film, which increased the defect density of the passive film and hence decreased its stability. After the 1st stage-potential decay, Fe-20Cr alloy exhibited the 2nd stage-potential decay to -654 mV(SCE) or to an active state in 9000 s. However, the 2nd stage-potential decay did not occur in the Cu-containing alloys because of the Cu enrichment on the surface of the alloy. The Cu enrichment in the Cu containing alloys decreased the defect density in the film, and hence increased the stability of the passive film. (C) 2012 Elsevier Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2013-01
Language
English
Article Type
Article
Keywords

IRON-CHROMIUM-ALLOYS; AUSTENITIC STAINLESS-STEEL; SEMICONDUCTING PROPERTIES; AISI 304-STAINLESS-STEEL; CORROSION; BEHAVIOR; ELEMENTS; OXIDES; COPPER; NICKEL

Citation

ELECTROCHIMICA ACTA, v.88, pp.170 - 176

ISSN
0013-4686
DOI
10.1016/j.electacta.2012.10.058
URI
http://hdl.handle.net/10203/174619
Appears in Collection
MS-Journal Papers(저널논문)
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