Influence of different electrolysis parameters on electrodeposition of γ- and α-Mn from pure electrolytes — a review with special reference to Russian language literature

Abstract

Recently an increasing interest in deposition of electrolytic Mn has been observed. Part of the experimental data published earlier (in the journals of the former Soviet Union), but unfamiliar to western researchers because of the inaccessibility of the literature is presented and compared. The following results were reported in these papers that were inaccessible to Western researchers: larger crystals of γ-Mn were obtained from chloride electrolytes than from sulfate electrolytes; the crystal structure of α-Mn phase was observed by XRD when Mo Kα radiation was used; the influence of Zn, Cd and Cu impurities on microhardness of Mn coatings was complex; successful deposition of γ-Mn was possible at temperature as high as 80°C from “ultra pure” sulfate electrolyte containing ammonium ion; the phase of deposited Mn from pure electrolytes was influenced by the cathode-substrate, but increase in current density allowed eliminating the influence of the cathode-substrate leading to the deposition of α-Mn coatings.