High Rate Anodic Nickel Dissolution in NaCl and NaClO3

摘要

An experimental investigation, to provide fundamental electrochemical data on the dissolution mechanism of nickel 200 in NaClO3 at high rates, was conducted. The investigation was principally concerned with the study of dissolution kinetics and stoichiometry. In chlorate solution, nickel showed passive-transpassive behavior while in chloride solution active dissolution took place. Presence of small amounts of chloride ions (0.01 N to 0.1 N) in chlorate solution changed the passive-transpassive behavior towards active dissolution. Current efficiency for dissolution was determined from anode weight loss measurements. In chlorate solution, a sharp rise of dissolution efficiency was observed between 3 amp/sq cm and 8 amp/sq cm beyond which a limiting efficiency of 58% was obtained. In chloride solution the efficiency was 100%. In chlorate solution containing 0.01 N to 0.1 N chloride ions, the dissolution efficiencies were calculated to be more than 100% at high current densities. (Author)