The corrosion resistance of Alloy IN-586, a nickel-base alloy containing 25% chromium + 10% molybdenum, which was developed primarily for use in high temperature applications such as flame tubes in gas turbine engines, has been determined in a range of aqueous environments. The alloy shows good resistance (loss of only 0·6 mm/yr) to corrosion in sulphuric acid up to 10% concentration, and in phosphoric acid (loss of < 0·7 mm/yr) up to 80% concentration. The resistance of the alloy to crevice and pitting attack in oxidising chloride media is also good. The corrosion behaviour of the alloy has been related to potential/current-density curves determined in various environments.
