期刊
SURFACE & COATINGS TECHNOLOGY
卷 206, 期 21, 页码 4349-4355出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2012.04.025
关键词
Trivalent chromium; Polyethylene glycol; Organic additives; Electrodeposition
资金
- National Platform Technology Program
- Leading Industry Development for Economic Region of Dongnam Leading Industry Office from the Ministry of Knowledge Economy (MKE)
The effects of pH and the organic additive, polyethylene glycol (PEG), on the trivalent chromium electroplating were investigated in view of the solution stability, electrochemical reactions and the properties of deposited layer. It was sought out that the concentration of chromic complexes in the chromic bath with formic acid was closely dependent on pH. The chromic complex formation in the bath, examined by theoretical calculation and UV-vis absorption measurement, was not affected by PEG addition. However, adsorbed PEG molecules on the cathode surface caused the hydrogen evolution rate to be retarded and the deposited coating morphology smooth, small cracks and nodular structure. The variations of solution acidity and organic additive concentration affected the complex formation, the cathodic reaction and the physical property of the deposit. (C) 2012 Elsevier B.V. All rights reserved.
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