An investigation was conducted to characterize the corrosion behavior of Type 316L stainless steel (UNS S31603) in a sulphamic acid (NH2HSO3) cleaning solution. Corrosion and electrochemical testing confirmed that the leak failure of Type 316L stainless steel pipe spool removed from a NH2HSO3 cleaning system was caused by general corrosion, which involved hydrogen gas evolution as the dominant cathodic process. Furthermore, it was found that failure recurrence can likely be avoided by the use of an appropriate corrosion inhibitor. In this study a commercial inhibitor “A” was very effective in reducing the corrosion rate of both non-welded and welded Type 316L stainless steel in the acid cleaning condition under study.

Subject
Acids, Acid inhibitors, Immersion tests, Corrosion rate, Aqueous solutions, Constants, Mechanical failure, Weight loss, Immersion, Stainless steel, Electrodes, Corrosion potential, Cleaning
Keywords:
stainless steel, corrosion resistance, sulphamic acid, acid inhibitors, polarization
Government work published by the Association for Materials Protection and Performance (AMPP) with permission of the author(s). Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2007
GOV
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