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这种新方法具体说明如下用钼酸或钼酸盐的一种以上、按钼换算,其浓度为10-200g/l;含铝的磷酸盐0.01g/l以上,并且添加有机酸或无机酸调整pH为1-6的酸性溶液中,处理镀锌钢材,使镀锌层表面形成耐腐蚀薄膜. 作为铝酸盐可以使用钼酸钠、钼酸钾、钼酸锂等其中一种以上的盐,按钼换算其浓度在10～200g/l范围,在此范围内,其溶解性及耐蚀性均优良,如浓度不到10g/l耐蚀性差;超过200g/l溶解困难,其理想的浓度在10～100g/l范围. 作为铝的磷酸盐用下面普通式Al_2O_5XP_2O_3Y H_2O(X、Y为1以上整数)表示,或者使用铝
The new method is described in detail as follows. One or more kinds of molybdic acid or molybdate are used, the concentration of which is 10 to 200 g / l in terms of molybdenum, 0.01 g / l or more of aluminum-containing phosphate, and organic or inorganic acid Adjusting the pH of 1-6 acidic solution, the galvanized steel is treated to form a corrosion-resistant film on the surface of the galvanized layer, and as the aluminate, one or more salts of sodium molybdate, potassium molybdate and lithium molybdate can be used , Its molybdenum conversion concentration range of 10 ~ 200g / l, in this range, its solubility and corrosion resistance are excellent, such as the concentration of less than 10g / l corrosion resistance; more than 200g / l dissolution difficult, the ideal The concentration is in the range of 10 to 100 g / l, the phosphate of aluminum is represented by the following general formula Al_2O_5XP_2O_3Y H_2O (X and Y are integers of 1 or more), or aluminum