Zinc phosphate coated metal and process of producing same

Details Zinc phosphate coated metal and process of producing same Zinc phosphate coated metal and process of producing same

B - Operations, Transporting

05

C

204/91

B05C 3/05 (2006.01) B01J 19/10 (2006.01) C23C 22/13 (2006.01) C23C 22/73 (2006.01)

Patent

CA 1230078

ABSTRACT OF THE DISCLOSURE A process is disclosed for forming conversion coatings on metallic surfaces. The disclosed process comprises the steps of immersing the metallic surface to be coated in a zinc phosphate conversion coating bath, exposing the immersed metallic surface to ultrasonic energy during at least part of the conversion coating process, said ultrasonic energy being produced by means of at least one ultrasonic transducer submerged within the zinc phosphate coating bath; moving said immersed metallic surface curvilinearly with respect to said transducers during at least part of the exposure to ultrasonic energy; and controlling the ultrasonic energy produced by such ultrasonic transducers so that the ultrasonic energy impinging on the metallic surface is above the point of cavitation and below a point at which the beneficial effects of the ultrasonic energy substantially diminishes. Metal surfaces thus treated have improved coverability with paint, oil, etc.

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