PURPOSE: To obtain surface treated steel plate excellent in resistance to blackening of worked part and adhesion of coating by a method wherein coating, which is made of (meth)acryl-styrene copolymer, the styrene component of which is set to lie within the certain range in mole percent, or to which the specified parts in weight of lubricant is added, is produced on the surface of plated steel plate.
CONSTITUTION: Chromate coating is produced on the surface of plated steel plat. The surface treated steel plate concerned is produced by forming organic resin coating on the chromate coating. The organic resin coating is (meth)acryl- styrene copolymer coating, the styrene component of which is set to be 10-40mol%. When higher lubricity is wanted, 1-25 pts.wt. of lubricant is added to 100 pts.wt. of resin. Thus, surface treated steel plate equipped with resistance to blackening of worked part and overlay paintability can be obtained.
TANAKA HIDETOSHI
TAKETSU HIROBUMI
UCHIDA YUKIO
