Mechanism of single and multiple step pickling of 304 stainless steel in acid electrolytes

被引：73
作者：
Li, LF
Caenen, P
Daerden, M
Vaes, D
Meers, G
Dhondt, C
Celis, JP
机构：
[1] Katholieke Univ Leuven, Dept MTM, B-3001 Louvain, Belgium
[2] Northeastern Univ, Dept Met, Sch Mat & Met Engn, Shenyang 110004, Peoples R China
[3] UGINE ALZ Belgium NV, Arcelor Grp, B-3600 Genk, Belgium
[4] UGINE ALZ, Res Ctr, Arcelor Grp, F-62330 Isbergues, France
来源：
CORROSION SCIENCE | 2005年 / 47卷 / 05期
关键词：
stainless steel; pickling; oxide scales; chromium-depleted layer; SEM;
D O I：
10.1016/j.corsci.2004.06.025
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Pickling of oxidised 304 stainless steel in single or multiple electrolytes was investigated based on weight loss and corrosion potential measurements. A smooth surface finish was obtained after an extended pickling in HCl, but some external oxide scales remained. On pickling in HF, the external oxide scales were fully removed, but internal oxide scales remained, and intergranular corrosion took place. Multi-step pickling in successive HCl and HF electrolytes allowed achieving a smooth surface finish free of any oxide scales. The sequence and duration of pickling steps in such multi-step pickling greatly influenced the final surface finish. Corrosion potential of oxidised stainless steel in both electrolytes could differ, and that difference leaded to a uniform pickling of stainless steel in HCl and a localised pickling in HF. (c) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1307 / 1324
页数：18
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