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Matco Associates Inc. Specialists in Materials Engineering, Corrosion and Failure Analysis

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The Corrosion Forum: Stainless Steel Corrosion

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    • CommentAuthorarkaplanda
    • CommentTimeFeb 16th 2010
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    I am working on a corrosion type that appeared on the surface of the 430 quality stainless steel.
    Could you please check the attachment photo and tell me what is the reason of this corrosion.

    thank you.
    • CommentAuthorjohnwentz
    • CommentTimeAug 13th 2010
     permalink
    To understand the possibility of corrosion in stainless, we must understand that it is an alloy, containing a minimum of 10-1/2% chromium.When chromium comes in contact with oxygen, it forms a natural barrier of chromium oxide called a "passive film", which helps stainless steel is able to "self heal" itself.Halogen salts, especially chlorides easily penetrate this "passive film" and will allow corrosive attack to occur.
    • CommentAuthorNiel
    • CommentTimeFeb 1st 2011
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    So at the end of the day even stainless steel requires a good corrosion prevention coating such as Rust Bullet.

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