Kinetics of zinc contact exchange on aluminum in diluted alkaline solutions

The contact deposition of zinc on aluminum in diluted alkaline solutions is studied, it is shown that polarization dia,at ams in their traditional sim plified version are inapplicable for determining the contact exchange curre nt in a system that involves the commensurable current of side reactions be cause the net polarization curve of corroding metal reveals only the differ ence between the metal's total anodic dissolution current and the current o f the oxidant's cathodic reduction. A possibility of extracting zinc from s pent solutions, as well as wash and local industrial waste waters, by its c ontact deposition on aluminum is shown.