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

被引：41

作者：

Zhang, YS ^{[1
]}

Zhu, XM ^{[1
]}

Liu, M ^{[1
]}

Che, RX ^{[1
]}

机构：

[1] Dalian Inst Railway Technol, Dept Mat Sci & Engn, Dalian 116028, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2004年 / 222卷 / 1-4期

基金：

中国国家自然科学基金;

关键词：

passive film; anodic passivation aging of passive film; surface modification; potential decline; XPS/AES analysis; Fe-Mn-Al-Cr alloys;

D O I：

10.1016/j.apsusc.2003.08.068

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 15 min to 5 h, the time required for the potential decay from the passive to active state increases from about 300 up to above 12,000 s, and the corrosion resistance in 1 mol l-(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. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：89 / 101

页数：13

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