Resistance of nickel and nickel-based alloys to nitric acid corrosion

2025-12-07View Original

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Nickel, nickel-copper alloys, and nickel-molybdenum alloys are similar to copper; they suffer severe corrosion in nitric acid at all concentrations, with very rare exceptions. Nickel-chromium-iron alloys (Inconel series) and nickel-chromium-iron-molybdenum alloys (Hastelloy C, F) contain a high amount of nickel, which gives them good resistance to nitric acid. The Inconel series is particularly suitable for use with nitric acid at concentrations of 20–60% at room temperature, as well as at concentrations below 3%; it is also suitable for use with fuming nitric acid at room temperature. Hastelloy C can resist nitric acid at all concentrations, but its high cost limits its applications.

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Resistance of nickel and nickel-based alloys to nitric acid corrosion

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