A commercial corrosion inhibitor named CI-11 was evaluated for stainless steel alloys (Fe-13Cr and Fe-21.5Cr) in acid conditions (10% acetic acid [CH3COOH]/1.5% hydrofluoric acid [HF]) and temperatures ranging from 168°C to 198°C. The inhibitor performances were investigated by weight-loss measurements and optical microscopy. The main variables analyzed were inhibitor concentration, test temperature, and heat treatment of the studied alloys. The results showed that the Fe-21.5Cr alloy presented superior corrosion resistance under the conditions investigated, considering temperature and inhibitor concentration. According to this study, the temperature to be used for stress-relief annealing is 400°C.

Subject
Acids, Corrosion resistant alloys, Molybdenum alloys, Chromium, Metallography, Chemical inhibition, Weight loss, Corrosion inhibitors, Steel, Corrosion resistance, Grain boundary, Alloys, Heat treatment
Keywords:
acid medium, carbides, chromium, corrosion resistance, heat treatment, high temperatures, inhibitors, steel, well acidification
NACE International
2003
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