| 摘要 |
PURPOSE:To obtain an integrated coating film excellent in rust-proof property by assembling an Al member subjected to preliminary zinc phosphate pretreatment into a steel product and successively performing zinc phosphate pretreatment, undercoating, intercoating and topcoating. CONSTITUTION:After wiping off press oil, rust-proof oil and dust, etc., stuck on the surface of an Al member, degreasing with a solvent and washing with water, a coated phosphate film having a passive state is formed on the surface by performing preliminary chemical conversion treatment with a zinc phosphate pretreating agent. Then the Al member obtained after the above-mentioned treatment is washed with water and thereafter it is heated at about 100 deg.C and dried. Thereafter the Al member finished with chemical treatment as in the above-mentioned method is assembled into a white body consisting of a steel product before pretreatment. Then after again subjecting the Al member assembled into the steel product to chemical treatment with the zinc phosphate pretreating agent, an integrated coating film excellent in rustproof properties is formed on the surface of the Al member by successively performing an ordinary coating process such as undercoating, intercoating and topcoating.
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