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The corrosive behaviors of hot-dip galvanized steel (GI) sheets and the corresponding interstitial free (IF) steel base sheets for use in automobiles were investigated by the classical salt water drop (SWD) test at room temperature.The corrosive processes and products were observed and analyzed through morphological observation,a scanning electronic microscope (SEM) and an energy dispersive spectrum (EDS).The results show that the anodic and cathode sites can be distinguished clearly during and after the test.The propagation of rusting,and the color,distribution and composition of the final corrosive products of the two kinds of materials are quite different.The SWD corrosive mechanisms of steel with and without galvanized coating are both discussed in this paper.
The corrosive behaviors of hot-dip galvanized steel (GI) sheets and the corresponding interstitial free (IF) steel base sheets for use in automobiles were investigated by the classical salt water drop (SWD) test at room temperature. Corrosive processes and products were observed and analyzed through morphological observation, a scanning electronic microscope (SEM) and an energy dispersive spectrum (EDS). The results show that the anodic and cathode sites can be distinguished clearly during and after the test. The propagation of rusting, and the color , distribution and composition of the final corrosive products of the two kinds of materials are quite different. The SWD corrosive mechanisms of steel with and without galvanized coating are both discussed in this paper.