아연계 인산염 피막용액에서 Fe(NO3)2 농도가 SCM430 합금의 전기화학적 거동에 미치는 영향
Effect of Fe(NO3)2 concentration on Electrochemical behavior of SCM430 in Zinc phosphate conversion coating solution
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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(NO3)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(NO3)3 concentration. Resistance of films formed on SCM430 alloy by chemical conversion treatment decreased with increasing Fe(NO3)3 concentration. Color and adhesion of chemical conversion coatings became darker and worse, respectively, with increasing Fe(NO3)3 concentration. It is concluded that addition of Fe(NO3)3 into a zinc phosphating bath leads to faster reaction to form porous surface coatings with poor adhesion and corrosion resistance.
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(NO3)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(NO3)3 concentration. Resistance of films formed on SCM430 alloy by chemical conversion treatment decreased with increasing Fe(NO3)3 concentration. Color and adhesion of chemical conversion coatings became darker and worse, respectively, with increasing Fe(NO3)3 concentration. It is concluded that addition of Fe(NO3)3 into a zinc phosphating bath leads to faster reaction to form porous surface coatings with poor adhesion and corrosion resistance.
참고문헌 (7)
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