| 摘要 |
PURPOSE:To improve the adhesion and chemical conversion ability of a compd. film by specifying the amt. of F ions in a fluoride-contg. treating soln., further specifying the concns. of nitrate ions, sulfate ions and metal ions in relation to the amt. of F ions, adding a specified amt. of an org. chelate compd. or the like and adjusting the pH of the soln. CONSTITUTION:This treating soln is a soln. of 1.5-5.0pH contg. 5-40g/l F ions, NO3 ions in 0.005-0.2 ratio of NO3 ions to F ions and SO4 ions in 0.02-0.5 ratio of SO4 ions to F ions as essential components and further contg. metal (Me) ions of one or more among Mg, Ca, Mn, Fe, Co, Ni, Zn and Mo in 0.02-0.5 ratio of Me ions to F ions and one or more among 0.1-2g/l org. chelate compd., 0.1-10g/l water soluble org. high molecular compd. and 0.01-3g/l surfactant. Ti or Ti alloy having a clean surface is immersed in the treating soln. at 40-80 deg.C for 3-15min to form a compd. film and then washing and drying are carried out.
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