| 摘要 |
PURPOSE:To form an electroplated film having superior adhesion to paint and corrosion resistance by using an additive contg. one or more kinds of water soluble org. polymers each made of a hydroxystyrene polymer (deriv.) having a specified average mol.wt. and a specified structure as essential components. CONSTITUTION:This additive for an electroplating bath contains one or more kinds of water soluble org. polymers each made of a hydroxystyrene polymer (deriv.) represented by the formula and having 1,000-1,000,000 weight average mol.wt. as essential components. The org. polymers are anionic, cationic or amphoteric. The additive is added to a zinc alloy plating bath or the like so that the amt. of the water soluble org. polymers is regulated to about 0.1-200g/l. When the additive is used, an org. polymer combined electroplated film having superior corrosion resistance in the naked state and after painting, superior weldability and press workability can be formed.
|
