Journal of Surface Science and Engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Study on Improvement of Mechanical Properties after Heat Treatment of Hard Chromium Electrodeposits with Additives

첨가제에 의한 경질 크롬 도금 층의 열처리 후 기계적 특성 향상에 관한 연구

  • Kang, Soo Young (Dept. of Metallurgical & Material Engineering, Inha Technical College) ;
  • Lee, Dae Won (School of materials science and engineering, Inha University)
  • 강수영 (인하공업전문대학 금속재료과) ;
  • 이대원 (인하대학교 신소재공학부)
  • Received : 2014.06.07
  • Accepted : 2014.06.25
  • Published : 2014.06.30
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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.

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