Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403

공학

한국표면공학회지 (47권3호 116-120)

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

강수영;이대원;
Kang, Soo Young;Lee, Dae Won;

인하공업전문대학 금속재료과;인하대학교 신소재공학부;
Dept. of Metallurgical & Material Engineering, Inha Technical College;School of materials science and engineering, Inha University;

DOI : 10.5695/JKISE.2014.47.3.116

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;