Effect of Magnesium Ion on the Zinc Electrodeposition from Acidic Sulfate Electrolyte

摘要

The effects of Mg2+ ion on the zinc electrodeposition were systematically investigated in sulfuric acid solution through the characterizations of current efficiency (CE), power consumption (PC), deposit morphology, cathodic polarization, and cyclic voltammetry. The results demonstrate that there is no significant influence on CE and PC in the Mg2+ concentration range of 1 to 10 g L−1, but with a drastic decrease of the CE and rapid increase of PC at Mg2+ ion concentration above 15 g L−1. Based on the morphology observation and polarization curves, the presence of Mg2+ ions could also induce the coarse surface on the electrodeposited zinc accompanying the enhancement of the cathodic polarization, which becomes more distinct at a high concentration above 15 g L−1. Furthermore, hydrogen evolution could be promoted with the existence of Mg2+ ions according to cyclic voltammograms.