Corrosion and stress corrosion cracking of high-performance alloys in simulated acidizing environments to 3500F

Laboratory corrosion and stress corrosion cracking tests were performed on commercially produced 1020 carbon steel; HASTELLOY alloys 535, G-3, C-276, and B-2; CABOT alloy No. 825; and alloys 28 and 904L in simulated acidizing environments containing NaCl, HCl, HCOOH, HF, and/or MgCl2. A commercial inhibitor provided excellent corrosion inhibition of the high-performance alloys at the boiling point and good inhibition in 15% HCl at 3500F. The use of high- performance alloys offers additional protection to corrosion over carbon steels in the acidizing environments. Non-HCl-containing acidizing environments were not nearly as corrosive as the HCl-containing environments. Stress corrosion cracking was observed in H2S-containing environments in HASTELLOY alloy B-2 and in HF-containing environments in the low nickel- and molybdenum-containing austenitic alloys such as alloy 904L, alloy 28 and alloy 535. Otherwise, no stress corrosion cracking was observed in the other alloys in the 24-hour tests