Electroplating of Chromium Coatings from Cr(III)-Based Electrolytes Containing Water Soluble Polymer
F. I. Danilov, V. S. Protsenko, T. E. Butyrina, E. A. Vasil’eva, and A. S. Baskevich
Ukrainian State Chemical and Technological University, pr. Gagarina 8, Dnepropetrovsk, 49005 Ukraine
Received August 3, 2005
Abstract — The effect of certain water-soluble synthetic polymers on the current efficiency, the kinetics of partial cathodic reactions, and certain properties of coatings at the chrome plating from sulfate–formate baths based on Cr(III) salts is studied. A polymeric additive of the nonionogenic type N1 (3
106 g/mol) is proposed, which favors the deposition of chromium coatings that have good adhesion to the surface, do not crack, and have a thickness of several tens micrometers. It is found that the polymers have an accelerating effect on the aggregation of the particles of the chromium-hydroxide sol formed in the near-electrode layer, which, apparently, improves the deposit quality and enhances the current efficiency. It is shown that the resulting amorphous–crystalline chromium deposits are sufficiently hard and exhibit good protectiven ability at the anodic dissolution in aggressive media.
106 g/mol) is proposed, which favors the deposition of chromium coatings that have good adhesion to the surface, do not crack, and have a thickness of several tens micrometers. It is found that the polymers have an accelerating effect on the aggregation of the particles of the chromium-hydroxide sol formed in the near-electrode layer, which, apparently, improves the deposit quality and enhances the current efficiency. It is shown that the resulting amorphous–crystalline chromium deposits are sufficiently hard and exhibit good protectiven ability at the anodic dissolution in aggressive media.
PACS numbers: 81.15.Fg, 82.45.Gj
DOI: 10.1134/S0033173206060075