This article needs additional citations for verification. (September 2018) (Learn how and when to remove this template message)
Rouging is 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.
There are three classes of rouging: Class I, Class II, and Class III.
Class I - stainless steel surface and the Cr/Fe ratio[clarification needed] 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.
- Rivera, Hadziselimovic, Lopolito (2017-02-15). "Preventive and Corrective Maintenance for Rouge in Stainless-Steel Equipment". PharmTech. Retrieved 2019-04-12.CS1 maint: multiple names: authors list (link)
- "Rouging". corrosion-doctors.org.
- "Rouging of Stainless Steel in High-Purity Water", Corrosion: Environments and Industries, ASM International, 2006, pp. 15–22, doi:10.31399/asm.hb.v13c.a0004103, ISBN 9781627081849
|This article about a mechanical engineering topic is a stub. You can help Wikipedia by expanding it.|