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日本每年生产1300万辆小汽车,对镀锌板的需求和性能要求日益提高。近年来,日本又有12条镀锌生产线已投产或即将投产。汽车用覆层钢板基本上为两种,一种是表面有一层富铁层的Zn-Fe合金覆层钢板;另一种是表面覆有有机材料的Zn-Ni合金覆层钢板。这两种覆层钢板均能满足具有5年耐穿孔性能的要求,并且耐蚀性高于纯锌厚镀层的耐蚀性。 1 Zn-Fe合金覆层 Zn-Fe合金覆层是通过镀锌退火法获得的。钢板在热镀锌后立即加热使铁原子向镀锌层扩散形成Zn-Fe合金。通常要求铁含量达到10(?)％左右。这种覆层的耐穿孔性能较好,但是在静电涂漆后,覆层表面
Japan produces 13 million cars a year, increasing the demand and performance of galvanized sheets. In recent years, Japan has another 12 galvanized production line has been put into operation or is about to put into operation. There are basically two kinds of automotive coated steel sheets, one is a Zn-Fe alloy coated steel sheet with an iron-rich layer on the surface and the other is a Zn-Ni alloy coated steel sheet with an organic material coated on the surface. Both of these coated steel sheets meet the requirement of 5-year puncture resistance and have higher corrosion resistance than pure zinc coating. 1 Zn-Fe alloy coating Zn-Fe alloy coating is obtained by galvanizing annealing method. The steel sheet is heated immediately after hot-dip galvanizing to diffuse the iron atoms to the galvanized layer to form a Zn-Fe alloy. Iron content is usually required to reach about 10 (?)%. This coating is more resistant to perforation, but after electrostatic painting, the coating surface