Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Investigation of the Effect of Solution Acidity and Organic Additives on the Electrodeposition of Trivalent Chromium Ions

3가크롬 이온의 전착 반응에 용액 산도 및 유기물 첨가제가 미치는 영향 연구

  • Lee, Joo-Yul (Materials Processing Division, Korea Institute of Materials Science) ;
  • Van Phuong, Nguyen (Anastro Laboratory, Department of Chemistry, Changwon National University) ;
  • Kang, Dae-Keun (Materials Processing Division, Korea Institute of Materials Science) ;
  • Kim, Man (Materials Processing Division, Korea Institute of Materials Science) ;
  • Kwon, Sik-Chol (Materials Processing Division, Korea Institute of Materials Science)
  • 이주열 (한국기계연구원 부설 재료연구소 융합공정연구본부) ;
  • ;
  • 강대근 (한국기계연구원 부설 재료연구소 융합공정연구본부) ;
  • 김만 (한국기계연구원 부설 재료연구소 융합공정연구본부) ;
  • 권식철 (한국기계연구원 부설 재료연구소 융합공정연구본부)
  • Received : 2010.11.15
  • Accepted : 2010.12.30
  • Published : 2010.12.31
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Abstract

The effect of solution acidity and organic additives, polyethylene glycol (PEG), on the trivalent chromium electroplating was systematically investigated in the view point of electroreduction of trivalent chromium ions and solution stability. It was found that solution acidity controlled at pH 2.5 showed the widest current range for bright electrodeposits in the presence of PEG additives, which reduced the local current intensification at high current densities. Through complex interaction between PEG additives and hydrogen ion, that is, solution acidity, electrode potential was moved in the negative direction in the bulk solution, while it shifted in the positive when electric potential was scanned. In conjunction with electrochemical quartz crystal microbalance (EQCM), it was found that PEG additives had a role in promoting the electron transfer to trivalent chromium ion complexes in bulk solution and their adsorption at the electrode surface as well as interfering with hydrogen ion reduction process below pH 2.5. The PEG additives developed the nodular morphology during electroreduction of trivalent chromium ions with the increase of solution acidity and enhanced its current efficiency by maintaining the consumption of complexant, formic acid, at low speed.

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