（1.BaosteelNSC Automotive Steel Sheets Co., Ltd., Shanghai 200941, China） (2.Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China
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DOI:
10.7502/j.issn.1674-3962.2016.05.11
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Abstract:
The affecting factors of the residues remained on cold rolled steel sheets and their influence on the corrosion resistance of the sheet were investigated in this paper. The electrochemical behaviors of the sheets with different surface status were studied by potentiodynamic method, and the rust prevention performance of the sheet during the processing interval was evaluated by simulated corrosion test. The results showed that the sheet presents a better corrosion resistance with a smaller corrosion current density when more quantity of residue oil and less amount of residue iron were detected on its surface, which is related to the shielding effect of the rolling oil. Compared with the effect of rolling parameter, the type of rolling oil is the key factor to determine the retention of residues on the surface of sheets, which has a further influence on the rust prevention of sheets. In addition, an inhomogeneity of electrochemical status is manifested on the sheets collected from different surface locations, and the extent of corrosion for the sheet from mediate location is the smallest, which is in good agreement with the results of simulated corrosion test. Nevertheless, all sheets keep a relatively good corrosion resistance in three days.