1　前　言在北美等寒冷地区为了解决盐害问题 ,从 2 0世纪 70年代后期开始 ,研制了各种表面处理钢板 ,并投入使用。此后 ,用量比例不断增加 ,至 2 0世纪 90年代已占据了汽车用钢板的 2 / 3以上。对于不同的表面处理钢板 ,各汽车生产厂家对防锈对策的考虑和对性能的重视也不尽相 1 Introduction In order to solve the problem of salt damage in cold regions such as North America, various surface-treated steel sheets have been developed and put into use since the late 1970s. Since then, the proportion of increasing use, to the 20th century, 90 has occupied more than two-thirds of automotive steel. For different surface treatment of steel, the automobile manufacturers to consider the anti-rust measures and the performance of the attention is not enough