| 摘要 |
A phosphating process suitable for electrolytic treatment, which uses a phosphating bath comprising a phosphate ion and phosphoric acid, nitric acid, a metal ion capable of forming a complex with phosphate ion in the phosphating bath and a metal ion having an electric potential at which the metal ion dissolved in the phosphating bath is reduced and deposited as metal of a value same as or higher than that of the anode electrolysis reaction of water, the solvent used in the bath, wherein the bath contains a metal ion other than a component of a coating to be formed in an amount of 0 to 400 ppm and is substantially free of solids affecting a coating film-forming reaction.
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