Combined effect of gamma-radiation and pH on corrosion of Ni–Cr–Fe alloy inconel 600

•Corrosion of Inconel 600 involves mainly Fe and Ni oxidation with minimal Cr oxidation.•Metal oxidation leads to two competing processes, oxide growth and dissolution.•Gamma-radiation increases the Fe and Ni oxidation rates, but its effect varies with pH.•Increased oxidation leads preferentially to oxide growth at pH25°C 10.6.•Increased oxidation leads preferentially to dissolution at pH25°C 6.0.