Immersion tests were performed on nickel (Ni)-based alloys in acidified 2 M lithium chloride (LiCl) solutions as a function of temperature and pH. Results indicated alloy C-22 (UNS N06022) and alloy C-276 (UNS N10276) were very resistant to corrosion in this environment to pH 1 at 95°C. Other alloys revealed extreme corrosion at low pH (alloy G-30 [UNS N06030] and alloy 20Mo6 [UNS N08026]) or accelerated corrosion due to solution aeration (alloy B-2 [UNS N10665]) and were not recommended for the process described. Failures of C-276 in similar service environments were attributed to poor control of process pH, with values ≤ 0.5 leading to extreme general corrosion.

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NACE International
1993
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