PRETREATMENT METHOD JOINING FOR METAL STOCK

PROBLEM TO BE SOLVED: To provide a pretreatment method where, in the case the members to be joined each made of a metal stock are coated or insert-formed with a resin material, or are joined using a resin or the like, the adhesion of both can be improved by a simple means. SOLUTION: The member (1) to be joined made of a metal stock is subjected to electrolytic treatment in an aqueous solution in which an electrolyte is dissolved, fine pores (2) with a pore size of 0.01 to 500 μm are formed at the joining face of the member to be joined by 20 to 80% in an area ratio of the pores. Thus, its joinability with the material (3) to be joined is improved. COPYRIGHT: (C)2008,JPO&INPIT