THE INITIATION OF PITTING CORROSION OF STAINLESS-STEELS AT OXIDE INCLUSIONS

被引：84

作者：

BAKER, MA

CASTLE, JE

机构：

[1] Department of Materials Science and Engineering, University of Surrey, Guildford

来源：

CORROSION SCIENCE | 1992年 / 33卷 / 08期

关键词：

D O I：

10.1016/0010-938X(92)90137-R

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The initial stages of pit growth for stainless steel exposed in 0.5 M H2SO4 + 0.5 M NaCl + 0.08% H2O2 at the free corrosion potential for 10 s have been examined by Auger and simultaneous EDX mapping and electron microscopy. This investigation was focussed on pits which initiated at mixed Al/Ti/Mn/Cr oxide inclusions. Auger/EDX maps showed the strong presence of Al in corrosion deposits partially covering the pit, and traces of Mn and Ti in deposits adjacent to the inclusions, indicating that these elements have been leached from the inclusion. The reduction of pH within the pit has resulted in partial dissolution of the generally inert oxide inclusion. Activity-pH diagrams have been used to interpret the dissolution and redeposition of the oxide inclusion components.

引用

页码：1295 / 1312

页数：18

共 18 条

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