Pitting corrosion mechanism of Type 304 stainless steel under a droplet of chloride solutions

被引：218

作者：

Tsutsumi, Yusuke ^{[1
]}

Nishikata, Atsushi ^{[1
]}

Tsuru, Tooru ^{[1
]}

机构：

[1] Tokyo Inst Technol, Dept Met & Ceram Sci, Meguro Ku, Tokyo, Japan

来源：

CORROSION SCIENCE | 2007年 / 49卷 / 03期

关键词：

stainless steel; rusting; atmospheric corrosion; pitting corrosion; relative humidity; chloride; seawater;

D O I：

10.1016/j.corsci.2006.08.016

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Pitting corrosion of Type 304 stainless steel under drops of MgCl2 solution has been investigated to clarify the rusting mechanism in marine atmospheres. A pitting corrosion test was performed under the droplets with various combinations of the diameter and thickness (height) by exposure to a constant relative humidity. Probability of occurrence of pitting corrosion decreased with decreasing the diameter and thickness. Pitting corrosion progressed only when the [Cl-] exceeded 6 M (RH < 65%). In almost cases, there was a small hole (similar to 10 mu m diameter) in the center of a single pit, which may be the trace of an inclusion particle like MnS dissolved out. The pitting corrosion mechanism of Type 304 under droplets containing chloride ions has been proposed. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：1394 / 1407

页数：14

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