Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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The Effect of Polyethylene Glycol on the Trivalent Chromium Electroplating

Polyethylene glycol이 3가크롬 전기도금에 미치는 효과

  • Lee, Joo-Yul (Materials Processing Division, Korea Institute of Materials Science) ;
  • Phuong, Nguyen Van (Anastro Laboratory, Department of Chemistry, Changwon National University) ;
  • Lim, Sung-Hwan (Microstructure & Materials Design Lab, Department of Advanced Materials Science and Engineering, Kangwon National University) ;
  • Han, Seung-Zeon (Materials Processing Division, Korea Institute of Materials Science) ;
  • Kwon, Sik-Chol (Materials Processing Division, Korea Institute of Materials Science)
  • 이주열 (한국기계연구원 부설 재료연구소 융합공정연구본부) ;
  • ;
  • 임성환 (강원대학교 신소재공학과) ;
  • 한승전 (한국기계연구원 부설 재료연구소 융합공정연구본부) ;
  • 권식철 (한국기계연구원 부설 재료연구소 융합공정연구본부)
  • Received : 2011.02.11
  • Accepted : 2011.02.27
  • Published : 2011.02.28
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Abstract

The effect of organic additives, polyethylene glycol (PEG), on the trivalent chromium electroplating was analysed in the view point of current efficiency, solution stability and metallurgical structure. It was measured that PEG-containing trivalent chromium solution had about 10% higher current efficiency than pure solution and controlled the micro-crack density of electrodeposits. PEG exhibited profound effect on the solution stability by reducing the consumption rate of formic acid which acts as a complexant to lower the activation energy required for electrochemical reduction of trivalent chromium ions. It was also revealed that the formation of chromium carbide layer was facilitated in the presence of polyethylene glycol, which meant easier electrochemical codeposition of chromium and carbon, not single chromium deposition. Trivalent chromium layer formed from PEG-containing solution was amorphous with local nano-crystalline particles, which were prominently developed on the entire surface after non-oxidative heat treatment.

Keywords

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