| 摘要 |
PROBLEM TO BE SOLVED: To form a film excellent in corrosion resistance and coating adhesion on the surface of a metal by using a chromium ion-free treating soln. SOLUTION: A surface treating agent contg. (a) a compd. expressed by the formula (R1, R2 and R3 independently denote hydrogen or a 1 to 4C alkyl groups) and having functional groups by >=2 pieces and (b) a compd. selected from organic acid, phosphoric acid and complex fluoride is used. Moreover, the molecular weight per piece of the functional group in the (a) is 100 to 30,000. It can moreover be incorporated with (c) a resin having a functional group selected from a tertiary amino group and a quaternary amino group in the skelton. Furthermore, it can be incorporated with (d) a fluorine compd. or the like of metal such as Co, W, V, Mg, Al, Mn and Ti. It can moreover be incorporated with (e) a compd. or the like having functional groups including a C=O group, a C=C group, a C≡C group, a C=N group, a C≡N group, an N=N group, an N-N group and S. The surface treating agent is applied on the surface of a metal, which is dried to form a film of 0.1 to 3.0 g/m2.
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