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

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 H 6 TeO 6 . The influence of the Te(VI) additive (0·55-2·20 mM) on cathode polarisation in a MASB was investigated. Current ef...

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Bibliographic Details
Published in:Transactions of the Institute of Metal Finishing 2011-11, Vol.89 (6), p.325-332
Main Authors: Galvanauskaite, N, Sulcius, A, Griskonis, E, Diaz-Arista, P
Format: Article
Language:English
Subjects:
Additives
Ammonium sulfate
Ammonium sulphate
Brittleness
Coating
Density
Manganese
Manganese ammonium sulphate bath
Mechanical properties
Morphology
Te(VI) additive
Tellurium
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Summary: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 H 6 TeO 6 . 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.
ISSN:0020-2967
1745-9192
DOI:10.1179/174591911X13167804920993