Process for forming a phosphate conversion coating on metal

Details Process for forming a phosphate conversion coating on metal Process for forming a phosphate conversion coating on metal

B - Operations, Transporting

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D

B05D 1/18 (2006.01) B05D 3/10 (2006.01) C23C 22/07 (2006.01) C23C 22/13 (2006.01) C23C 22/22 (2006.01) C23C 22/36 (2006.01) C23C 22/44 (2006.01) C23C 22/78 (2006.01)

Patent

CA 2381774

A metal surface on which a phosphate conversion coating is to be formed and which has been surface conditioned by contact with a liquid surface conditioner composition that contains dispersed fine particles of solid phosphate of at least one divalent or trivalent cations type and an adhesion promoting agent. After such conditioning, a very high quality conversion coating can be formed on the surface by contact with a nickel-free liquid phosphating composition that contains at least acid, zinc cations, and phosphate anions and optionally and preferably also contains other materials.

L'invention concerne une surface métallique, sur laquelle un revêtement de conversion à base de phosphate doit être réalisé. Cette surface métallique a été conditionnée par contact avec une composition liquide de conditionnement de surface qui comporte de fines particules dispersées de phosphate solide, d'au moins un type de cations divalents ou trivalents et un agent de renforcement d'adhérence. Après un tel conditionnement, un revêtement de conversion de très haute qualité peut être réalisé sur la surface par contact avec une composition liquide de phosphatation dépourvue de nickel, qui contient au moins de l'acide, des cations zinc, des anions phosphate et éventuellement, et de préférence, aussi d'autres matériaux.

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