The anodic polarization behavior of amorphous PdTiP alloys in NaCl solutions

Abstract

The corrosion resistance and electrocatalytic activity for chlorine evolution of amorphous PdTiPalloys in NaCl solutions was investigated. Particular attention was given to the difference between amorphous and crystalline states and the effect of titanium addition. The corrosion rate of the amorphous alloys in the potential region for gas evolution was significantly lower than that of palladium over wide ranges of polarization potential and pH of solutions. This fact was attributed to the formation of a uniform passive film on the amorphous alloys and to the stabilization of passivity by the addition of titanium. The catalytic activity of the amorphous alloys for gas evolution was lower than that of palladium and decreased with an increase in titanium conten-t. The oxygen overvoltage of amorphous PdTiP alloys is considerably higher similarly to that of palladium