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PROCESS FOR PHOSPHATING METAL SURFACE TO MAKE THEREON A ZINC PHOSPHATE COATING FILM
PROCESS FOR PHOSPHATING METAL SURFACE TO MAKE THEREON A ZINC PHOSPHATE COATING FILM
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机译:磷化金属表面以形成磷酸锌涂层膜的过程
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摘要
A metal surface is processed with dipping by a first zinc phosphating solution in which a fluoride complex and a simple fluoride are contained and a concentration of this simple fluoride is 200 to 300 mg/l on a basis converted into the HF concentration and that of the fluoride complex is in a mole ratio with the simple fluoride converted into the HF as shown as, fluoride complex! / simple fluoride! ~ 0.01, and then the surface is processed with spraying by a second zinc phosphating solution in which a simple fluoride concentration is 500 mg/l or less and higher than that in said first zinc phosphating solution. Thus, on a metal surface is formed a zinc phosphate coating film which is suitable for electrodeposition coating, particular for cationic electrodeposition coating, and superior in coating film adhesion, corrosion-resistance, particularly resistance for warm brine, and prevention of scab-corrosion.
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