Pre-rinse for phosphating metal surfaces

Details Pre-rinse for phosphating metal surfaces Pre-rinse for phosphating metal surfaces

C - Chemistry, Metallurgy

23

C

C23C 22/78 (2006.01) C23C 22/18 (2006.01)

Patent

CA 2169927

A method for preparing a pre-rinse composition for phosphating metal surfaces uses an aqueous suspension comprising water-insoluble manganese (II) phosphate. The manganese phosphate is obtained as a solid and heated at a temperature greater than 120 °C prior to its incorporation into the aqueous suspension. The invention has been found to enable formation of fine phosphate coatings in a subsequent phosphating step and enables the use of relatively low phosphating temperatures.

Un procédé de préparation d'une composition de rinçage préliminaire destinée au dépôt de phosphate sur des surfaces métalliques, utilise une suspension aqueuse comprenant un phosphate (II) de manganèse insoluble dans l'eau. Ce phosphate de manganèse est obtenu comme un solide et chauffé à une température supérieure à 120 DEG C avant son incorporation dans la suspension aqueuse. On a trouvé que l'invention permettait la formation de fins revêtements de phosphate lors de l'étape ultérieure de dépôt de phosphate et qu'elle permettait également l'utilisation de températures relativement basses pour effectuer ce dépôt.

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