Corrosion Inhibitors for 13Cr Steel

Corrosion inhibitors developed for low alloy metals have been found to have limited use on stainless steels such as 13Cr. Stainless steels are being successfully used to combat H2S and CO2 corrosion but are proving susceptible to hydrochloric acid (HCl). This paper presents results of tests made with 13Cr steel subjected to corrosion by HCl. Several inhibitors and inhibitor systems are compared under varying temperatures and acid concentrations. These comparisons reveal (1) 13Cr steel's greater susceptibility to corrosion than that of low alloy N-80 steel, and (2) the effects of different corrosion inhibitors in reducing the attack on the metal tested.