Electrochemical behaviour of high nitrogen stainless steel in acidic solutions

The electrochemical behaviour of high nitrogen stainless steel in acidic solutions was studied by potentiodynamic polarization, EIS, Mott–Schottky and XPS. The passive film formed in neutral NaCl solution was very stable, but the stability of the film decreased with the addition of H 2SO 4 into the...

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Bibliographic Details
Published in:Corrosion science 2009-05, Vol.51 (5), p.979-986
Main Authors: Qiao, Y.X., Zheng, Y.G., Ke, W., Okafor, P.C.
Format: Article
Language:English
Subjects:
A. Stainless steel
Applied sciences
B. EIS
B. XPS
C. Acid corrosion
C. Passive films
Corrosion
Corrosion environments
Exact sciences and technology
Metals. Metallurgy
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Summary:The electrochemical behaviour of high nitrogen stainless steel in acidic solutions was studied by potentiodynamic polarization, EIS, Mott–Schottky and XPS. The passive film formed in neutral NaCl solution was very stable, but the stability of the film decreased with the addition of H 2SO 4 into the solution. The passive film formed in acidic Na 2SO 4 has a superior protective ability than that in acidic NaCl solution. The stability of the film formed in tested solution decreased with increase of applied potentials. The film formed on steel surface was of n-type semiconductor. Chloride penetration mechanism was proposed for the observed passive film breakdown.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2009.02.026