Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Effect of Fe(NO3)2 Concentration on Electrochemical Behavior of SCM430 in Zinc Phosphate Conversion Coating Solution

아연계 인산염 피막용액에서 Fe(NO3)2 농도가 SCM430 합금의 전기화학적 거동에 미치는 영향

  • Kwon, Duyoung (Surface Technology Division, Korea Institute of Materials Science) ;
  • Song, Pung-Keun (Department of Materials Science and Engineering, Pusan National University) ;
  • Moon, Sungmo (Surface Technology Division, Korea Institute of Materials Science)
  • 권두영 (재료연구소 표면기술연구본부 전기화학 연구실) ;
  • 송풍근 (부산대학교 재료공학부) ;
  • 문성모 (재료연구소 표면기술연구본부 전기화학 연구실)
  • Received : 2019.08.27
  • Accepted : 2019.08.30
  • Published : 2019.08.30
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Abstract

The formation behavior of zinc phosphate conversion coating (ZPCC) on SCM430 alloy was investigated in 25 vol.% of 1M ZnO + 170 ml/L solution containing various $Fe(NO_3)_2$ concentrations, using open-circuit potential(OCP), electrochemical impedance spectroscopy(EIS), cyclic polarization(CP) curve and tape peel test. OCP of SCM430 alloy and corrosion current density increased with increasing $Fe(NO_3)_3$ concentration. Resistance of films formed on SCM430 alloy by chemical conversion treatment decreased with increasing $Fe(NO_3)_3$ concentration. Color and adhesion of chemical conversion coatings became darker and worse, respectively, with increasing $Fe(NO_3)_3$ concentration. It is concluded that addition of $Fe(NO_3)_3$ into a zinc phosphating bath leads to faster reaction to form porous surface coatings with poor adhesion and corrosion resistance.

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References

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