Highly corrosion resistant surface treated steel plate for fuel tank
专利汇可以提供Highly corrosion resistant surface treated steel plate for fuel tank专利检索，专利查询，专利分析的服务。并且PURPOSE:To prepare a highly corrosion resistant surface treated steel plate for a fuel tank, by forming a reaction type chromate film and a coating type chromate film to the plated surface of a single surface Zn-Ni alloy electroplated steel plate while suppressing the amount of the Cr-compound adhered to the non- plated surface of said steel plate to a specific amount or less. CONSTITUTION:As the steel plate for the gasoline tank of a car, 20-40mg/m of a Zn-Ni alloy is electroplated only to the single surface of a cold rolled steel plate. This steel plate is immersed in a treating solution containing CrO3, SO4 ions and Cl-ions to form 10-50mg/m of a reaction type chromate film to the plated surface on the basis of Cr. Succeedingly, the Cr-compound adhered to the non-plated surface is removed so as to be reduced to 0.9mg/m or less on the basis of Cr by polishing. In the next step, only the plated surface is treated with a treating solution containing more than 5g/l of CrO3 and colloidal silica to form a coating type chromate film containing 10-120mg/m of SiO2 or divalent Ni and Co ions and 50mg/m or less of a Cr-compound on the basis of Cr.，下面是Highly corrosion resistant surface treated steel plate for fuel tank专利的具体信息内容。
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