申请人:Miura Ichiro
公开号:US20050173678A1
公开(公告)日:2005-08-11
A surface treatment agent is applied onto a metal film of a printed circuit board to form a rust preventive film. The surface treatment agent for metal comprises an aqueous solution comprising an organic acid having a boiling point of 170° C. or higher and one or more compound selected from the group consisting of an imidazole based compound and a benzimidazole based compound.