Chemical conversion treatment liquid for metallic material...

C - Chemistry – Metallurgy – 23 – C

Patent

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C23C 22/13 (2006.01) C23C 22/36 (2006.01)

Patent

CA 2742002

Provided is a zinc phosphate-based chemical conversion treatment solution. The treatment solution can form a coating film permitting satisfactory application of a coating material thereon, and brings about a reduction in the production of sludge. A treatment solution for depositing a zinc phosphate coating on a metal material via chemical conversion, which consists of an aqueous solution containing 500 to 4000ppm of phosphate ions and 300 to 1200ppm of zinc ions and has a pH of 3.6 to 4.4, characterized in that the factor K falls within the range of 1 to 50 wherein the factor K is a value calculated from phosphate ion concentration (P[ppm]), zinc ion concentration (Z[ppm]) and pH (X) according to the formula: K = 10x x P2 x Z3 / 10 18.

Cette invention concerne une solution de traitement par conversion chimique à base de phosphate de zinc.  La solution de traitement peut former une couche de revêtement permettant lapplication satisfaisante dun matériau de revêtement sur celle-ci, et elle assure la réduction de la production de résidus. Une solution de traitement destinée au dépôt par conversion chimique dun revêtement à base de phosphate de zinc sur un matériau métallique consiste en une solution aqueuse contenant de 500 à 4 000 ppm dions phosphate et de 300 à 1 200 ppm dions de zinc et elle présente un allant de 3,6 à 4,4. Ladite solution est caractérisée en ce que le facteur K va de 1 à 50, ledit facteur K étant une valeur calculée en fonction de la concentration dions phosphate (P [en ppm]), de la concentration en ions de zinc (Z [en ppm]) et du pH (X) selon la formule : K = 10x × P2 × Z3 / 1018.

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