| abstract |
The present invention has for its object to provide anmetallic surface treating agent for PCM use, which is capablenof imparting high processability and corrosion resistance tonPCM steel panels with the additional advantage of improvednstorage stability, a method for surface treatment of a PCM steelnpanel, a method of producing a PCM steel panel, and a PCM steelnpanel as produced by said method. n This invention provides a nonchromate metallic surfacentreating agent for PCM use n which comprises, in each liter thereof,n (a) a silane coupling agent and/or a hydrolytic condensationnproduct thereof in an amount of 0.01 to 100 g/l, (b) water-dispersible silica in a proportion of 0.05 to 100ng/l (solids), and (c) a zirconium compound in an amount of 0.01 to 50 g/l in termsnof zirconium ion and/or a titanium compound in an amount of 0.01nto 50 g/l in terms of titanium ion. |