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Influence of Te(VI) additive on manganese electrodeposition at room temperature and coating properties

Abstract The preparation of a stable manganese ammonium sulphate bath (MASB) with a Te(VI) additive was investigated. It was found that the best Te(VI) additive is orthotelluric acid H6TeO6. The influence of the Te(VI) additive (0·55–2·20 mM) on cathode polarisation in a MASB was investigated. Current efficiency of manganese coatings electrodeposited from the MASB with 2·20 mM Te(VI) additive ranged from 34·1 to 37·7% and the concentration of incorporated tellurium was from 0·88 to 2·22%. It was determined that coatings reached the maximum values of tensile stress during the initial period of electrolysis. Tellurium incorporates in Mn coatings and changes their structure and morphology. This also influences microhardness of the coatings. The electrodeposited coatings consist of a mixture of two phases: brittle α-Mn and plastic β-Mn. A brittle α-Mn phase predominates in coatings obtained at high current densities.