CORROSION BEHAVIOR OF LOW-ANTIMONY LEAD ALLOY IN SULFURIC-ACID-SOLUTION

The influence of cooling rate immediately after solidification on the corrosion behaviour of a low-antimony lead alloy in sulfuric acid solu tion has been studied at: (i) fixed potentials of 1350 and 1100 mV; (i i) cyclic potentials of 1350/1100 mV. The rate of cooling had little i nfluence on the corrosion rate. At 1350 mV, the weight loss was linear with time, probably because the weight loss was determined by diffusi on of oxygen across a subcorrosion layer of constant thickness. The co rrosion occurred preferentially in the interdendritic regions. By cont rast, the corrosion at 1100 mV occurred uniformly at considerably lowe r rates and there was a parabolic relationship between weight loss and time. Increasing temperature dramatically increases the corrosion rat e.