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Electrochemical Behavior and Corrosion Protection of Galvanized Steel Sheet Treated in Ce Based Solution  

Song, Yon-Kyun (Technical Research Laboratories, POSCO)
Mansfeld, F. (Dept. of Materials Science, University of Southern California)
Publication Information
Corrosion Science and Technology / v.7, no.6, 2008 , pp. 332-337 More about this Journal
Abstract
A reaction and evaporation types of cerium based conversion coatings were developed for galvanized steel sheet. The corrosion loss Q(Cb/cm2) and protection efficiency P(%) were obtained using a polarization technique for cerium based conversion coatings on galvanized steel exposed to 0.5N NaCl for 7 days. The microstructure of coating layer was observed using SEM. An excellent corrosion reistnce of galvanized steel was obtained by two types of cerium basd conversion coating. Salt spray test was done to evaluate the corrosion resistance of three samples by visual inspection. The corrosion ranking of three samples-untreated and two treatedby electrochemical data was matched well with the results of salt spray test.
Keywords
cerium based conversion coating; galvanized steel; corrosion;
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