High coating weight iron phosphating compositions

C - Chemistry – Metallurgy – 23 – C

Patent

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Details

C23C 22/00 (2006.01) C23C 22/08 (2006.01) C23C 22/10 (2006.01) C23C 22/36 (2006.01) C23C 22/83 (2006.01)

Patent

CA 2274094

Iron phosphate conversion coatings that are well adapted to serve as carriers for metal cold working lubricants, particularly such lubricants that contain polyoxyethylene adducts of long chain primary alcohols as a major lubricating component, can be formed on ferriferous surfaces within practical time such as 5 to 10 minutes by contact with an aqueous solution of almost neutralized phosphoric acid that has sufficient Free Acid and/or Total Acid content to form a heavier phosphate conversion coating than do conventional iron phosphating compositions. The phosphate conversion coating forming aqueous liquid composition advantageously also contains an accelerator component such as chlorate or hydroxylamine.

La présente invention concerne des revêtements de conversion en phosphate de fer aptes à être utilisés comme supports de lubrifiants pour le travail à froid des métaux, en particulier les lubrifiants contenant des produits d'addition de polyoxyéthylène et d'alcools primaires à longue chaîne comme composant de lubrification principal, lesquels revêtements peuvent être formés sur des surfaces ferrifères en des temps pratiques de 5 à 10 minutes, par contact avec une solution aqueuse d'un acide phosphorique presque neutralisé ayant une teneur en acide libre et/ou en acide total suffisante pour former un revêtement de conversion en phosphate de fer plus lourd que les compositions de phosphatation du fer traditionnelles. Pour plus d'efficacité, la composition aqueuse liquide utilisée pour former le revêtement de conversion en phosphate de fer contient également un composant accélérateur tel que le chlorate ou l'hydroxylamine.

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