Abstract
The effect of 2wt.% Cu addition on the corrosion resistance of Ni–30Co–16Cr–15Mo–6Fe alloy in hydrofluoric acid was investigated by immersion testing at 100°C. Microstructural observations of the passive film of samples after immersion testing via various methods revealed that the small addition of Cu yielded a tremendous improvement in corrosion resistance, even after cold forging. In addition, the passivation of Ni–30Co–16Cr–15Mo–6Fe alloy by a Mo-oxide-dominated passive film was completely changed to passivation by a Cu-dominated one in Ni–30Co–16Cr–15Mo–6Fe–2Cu alloy during immersion in hydrofluoric acid solution because the segregation behaviour of Cu was much stronger compared to that of Mo.
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