A radiotracer study on the reactionbetween zinc and chromate

Abstract

The reaction between zinc and chromate has been studied using Cr 51 and the effect of solution concentration on the uptake of radioactivity has been examined in the range of 10 −5 − 10 −3 M. In 1 × 10 −3 M K 2 CrO 4 the uptake of chromium follows a direct logarithmic law similar to thatfor the oxidation of zinc in air. Chromate normally acts as a corrosion inhibitor but in concentrations 7·5 × 10 −4 M, chromate accelerates corrosion. The uptake of activity varies with time according to A n = k t , where n is a constant depending on the concentration. The effect of a number of anions on the uptake of chromium from solution has been examined.