为了研究轧制过程中冷轧汽车板表面残留物的影响因素，及其对钢板表面耐蚀性能的影响，运用扫描电化学极化曲线对不同表面状态冷板的腐蚀行为进行了对比研究，并运用室内模拟腐蚀实验对钢板不同位置的工间防锈性能进行了评价。结果表明钢板表面残油量越多，残铁量越少，其表面腐蚀电流密度越小，耐蚀性能越好，这与残油所具有的物理屏蔽作用有关。与轧制参数差异带来的影响相比，轧制油的种类是影响钢板表面残留物的关键因素，进而影响钢板的防锈性能。工间防锈实验结果表明，钢板表面不同位置存在明显的电化学状态不均匀性，但所有位置试样在存储期的前3天内均可保持较好的耐蚀状态。相对来说，中间位置试样的平均锈蚀度最小，腐蚀电流密度最小，可见中间位置的残油较多、分布较均匀，阻碍了锈蚀的发生。
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 in?terval 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 collect?ed 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 re?sistance in three days.
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