Effects of anodic passivation on the constitution, stability and resistance to corrosion of passive film formed on an Fe-24Mn-4Al-5Cr alloy

The effects of anodic aging time and potential on the corrosion resistance, stability and constitution of the passive film formed on an Fe-24Mn-4Al-5Cr alloy in 50% HNO3 solution were studied by using combined electrochemical measurements and Auger electron spectroscopic (AES)/X-ray photoelectron sp...

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Bibliographic Details
Published in:Applied surface science 2004-01, Vol.222 (1-4), p.89-101
Main Authors: Zhang, Y.S, Zhu, X.M, Liu, M, Che, R.X
Format: Article
Language:English
Subjects:
Anodic passivation aging of passive film
Applied sciences
Chemical composition analysis, chemical depth and dopant profiling
Corrosion protection
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Fe-Mn-Al-Cr alloys
Materials science
Materials testing
Metals. Metallurgy
Passivation
Passive film
Physics
Potential decline
Surface modification
Surface treatments
XPS/AES analysis
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Summary:The effects of anodic aging time and potential on the corrosion resistance, stability and constitution of the passive film formed on an Fe-24Mn-4Al-5Cr alloy in 50% HNO3 solution were studied by using combined electrochemical measurements and Auger electron spectroscopic (AES)/X-ray photoelectron spectroscopic (XPS) analysis. In the anodic passive region, prolonged anodic aging time or increased passivating potential can induce better protective and stable properties of the passive film and better resistance to corrosion. With increasing aging time from 15min to 5h, the time required for the potential decay from the passive to active state increases from about 300 up to above 12,000s, and the corrosion resistance in 1moll−1 Na2SO4 solution of Fe-24Mn-4Al-5Cr alloy, characterized by polarization curves, is superior to that of Fe-13% Cr-0.1% C stainless steel. AES and XPS analyses of the aging passive film show that these improvements of properties are related to modifications of the passive layer with time. The increase of resistance to corrosion is attributed to Al2O3 and Cr2O3 enrichment and oxides of Fe and Mn depletion in the passive film and a thickening of the effective barrier layer of oxides.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2003.08.068