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http://dx.doi.org/10.5695/JKISE.2019.52.4.233

Effect of Fe(NO3)2 Concentration on Electrochemical Behavior of SCM430 in Zinc Phosphate Conversion Coating Solution  

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)
Publication Information
Journal of the Korean institute of surface engineering / v.52, no.4, 2019 , pp. 233-238 More about this Journal
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.
Keywords
Chemical Conversion Coating; SCM430 Alloy; phosphating; $Fe(NO_3)_2$ concentration;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
연도 인용수 순위
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