Real time pit initiation studies on stainless steels: The effect of sulphide inclusions

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• 作者：T.L. Sudesh L. Wijesinghe ; Daniel John Blackwood
• 关键词：A. Stainless steel ; B. AFM ; B. Potentiostatic ; C. Pitting corrosion
• 刊名：Corrosion Science
• 出版年：2007
• 出版时间：April 2007
• 年：2007
• 卷：49
• 期：4
• 页码：1755-1764
• 全文大小：599 K

文摘

It has long been accepted that manganese sulphide favours pitting on stainless steels. However, there are different standpoints on the most important mechanism for pit initiation; due to dissolution of sulphide inclusions, chromium depletion around the inclusion or mechanical rupture of the passive film by metal chlorides. Analysing the pitting potential and metastable pitting rates on different grades of stainless steels has rationalised the effect of sulphide content on pitting corrosion resistance. In situ atomic force microscopy (AFM) has been used in conjunction with conventional electrochemical techniques for imaging real time pit initiation events.