연구논문집

Korea Institute of Machinery & Materials (한국기계연구원)
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Fabrication of Chromium-based Double Layered Deposit

크롬계 이중도금층 제조 및 특성평가

  • 박상언 (한국기계연구원 표면기술연구부 전기화학응용그룹) ;
  • 김동수 (한국기계연구원 표면기술연구부 전기화학응용그룹) ;
  • 김만 (한국기계연구원 표면기술연구부 전기화학응용그룹) ;
  • 장도연 (한국기계연구원 표면기술연구부 전기화학응용그룹) ;
  • 권식철 (한국기계연구원 표면기술연구부 박막공정그룹)
  • Published : 2001.12.20
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Abstract

In chromium electrodeposition, crack is inevitably accompanied by chromium layer. Behavior of crack formation and crack density were different from the plating conditions such as current density, temperature, waveform of applied current and so on. And cracks have an influence on the corrosion resistance of chromium deposit, because corrosion occurs through the network of cracks between deposit and substrate. Therefore, many researches have been achieved in order to remove the cracks in chromium deposit. Formation of double layers, Cr/Cr and Ni/Cr were investigated to increase corrosion resistance of chromium deposit in this study. As pretreatment prior to outer chromium coating, acid pickling and current control method were examined. Cracks in cross-section of each sample were observed with SEM and CASS(Copper modified acetic acid salt spray) test was performed to evaluate corrosion resistance. It was found that corrosion resistance of Cr/Cr and Ni/Cr double layers were superior to Cr or Ni single layer from the results of CASS test.

Keywords