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07205 Corrosion of Stainless Steel in Sulfamic Acid Cleaning Solutions

An investigation was conducted to characterize the corrosion behavior of Type 316L stainless steel (UNS S31603) in a sulphamic acid (NH2HSO3) cleaning solution.

Product Number: 51300-07205-SG
ISBN: 07205 2007 CP
Author: Joseph R. Kish, Neville J. Stead, and Douglas L. Singbeil
Publication Date: 2007
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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.

Keywords: stainless steel, corrosion resistance, sulphamic acid, acid inhibitors, polarization

 

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.

Keywords: stainless steel, corrosion resistance, sulphamic acid, acid inhibitors, polarization

 

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