Process for producing zinc-iron alloy electroplated steel sheet excellent in phosphate treatment property

摘要

The present invention relates to a method for coating a zinc phosphate coating on a zinc-iron alloy plating layer in an electroplating bath capable of continuous production, and a method for manufacturing a zinc-iron alloy electroplated steel sheet excellent in phosphate treatment .;In the carrozel-type electroplating bath, since the zinc-iron alloy coated steel sheet contains iron in the coating, it is difficult to dissolve the plating layer during the phosphate treatment, so that the phosphate coating is hardly formed in the treatment of several seconds. In order to improve the paintability If the coating is not adhered in a certain amount, the paint is not easily applied and the corrosion resistance is lowered and the coating film adhesion is deteriorated, which causes a great problem. In order to solve the above problems and achieve the object of the present invention, in the present invention, zinc-iron alloy plating is first carried out in an electroplating bath capable of continuous production, and the obtained zinc-Zinc in an amount of 100 to 500 mg / m²The present invention relates to a method for producing a zinc-iron alloy plated steel sheet excellent in phosphate treatment ability to obtain a uniform and dense phosphate film even at a short phosphate treatment time.