Effect of hydrogen peroxide concentration on surface properties of Ni–Cr alloys

The effect of concentration of hydrogen peroxide (H2O2) on the surface properties of Ni–Cr alloys was studied. Surface roughness and surface morphology of Ni–Cr alloys were evaluated by surface profiler and scanning electron microscopy after being immersed in different concentrations of H2O2 for 112 h. Surface corrosion products of Ni–Cr alloys were analyzed by photoelectron spectrograph after being immersed in 0% and 30% H2O2. The order of increasing surface roughness of Ni–Cr alloys after being immersed in different concentrations of H2O2 was 0<3.6%<10%<30%. As the concentration of hydrogen peroxide increased, the surface roughness of Ni–Cr alloys increased and the surface morphology showed different degrees of corrosion. According to the XPS results, the corrosion products formed on the outmost surface layer of the studied samples are Ni(OH)2 and BeO.