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Rouging

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This is an old revision of this page, as edited by 131.151.161.156 (talk) at 09:49, 17 January 2012 (grammar; ferrous steel is redundant and literally means iron-based iron that has some carbon). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

Rouging refers to a form of corrosion found in stainless steel. It can be due to iron contamination of the stainless steel surface due to welding of non-stainless steel for support columns, or other temporary means, which when welded off leaves a low chromium area.[1]

There are three classes of rouging: Class I, Class II, and Class III.

Class I - stainless steel surface and the Cr/Fe ratio of the metal surface beneath such deposits usually remain unaltered.
Class II - Iron particles originating in-situ on unpassivated or improperly passivated stainless steel surfaces. By their formation the Cr/Fe ratio of the metal surface is altered.
Class III - Iron oxide (or scale) which forms on surfaces in high temperature steam systems. The Cr/Fe ratio of the protective film is usually altered.

References

  1. ^ http://corrosion-doctors.org/MatSelect/rouging.htm

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