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