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http://dx.doi.org/10.5695/JKISE.2014.47.3.116

Study on Improvement of Mechanical Properties after Heat Treatment of Hard Chromium Electrodeposits with Additives  

Kang, Soo Young (Dept. of Metallurgical & Material Engineering, Inha Technical College)
Lee, Dae Won (School of materials science and engineering, Inha University)
Publication Information
Journal of the Korean institute of surface engineering / v.47, no.3, 2014 , pp. 116-120 More about this Journal
Abstract
The addition of cyclo propane carbonyl (cpc) to chromium electroplating bath resulted in a chromium deposit which had greatly improved mechanical properties compared to conventional chromium deposits in condition of heat treatment at high temperature. The as-deposited layers had a Vicker's hardness of about 1170, which is comparable to that of conventional chromium plating deposits. With annealing, the hardness goes through a maximum of 1650 at $600^{\circ}C$. Generally speaking, the hardness of conventional plating decreases monotonically with heat treatment. X-ray diffraction show that annealing up to above $400^{\circ}C$ causes formation and growth of chromium crystallites and that chromium carbides form at above $500^{\circ}C$ temperature.
Keywords
Electrodeposits; Chromium; Heat Treatment; Organic additives; Mechanical properties;
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