Composition and process for treating the surface of...

C - Chemistry – Metallurgy – 23 – C

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C23C 22/23 (2006.01)

Patent

CA 2187795

A surface of aluminiferous metal is brought into contact at 30 ~C to 65 ~C for 5 to 60 seconds with a surface treatment bath with a pH of 2.0 to 6.5 that contains phosphate ion, condensed phosphate ion, and a water soluble polymer in the following weight proportions: 1 - 30 : 0.1 - 10 : 0.2 - 20. This is followed by a water rinse and drying by heating. The water soluble polymer has a chemical structure conforming with formula (I), in which (i) each of X1 and X2 represents a hydrogen atom, a C1 to C5 alkyl group, or a C1 to C5 hydroxyalkyl group; (ii) each of Y1 and Y2 represents a hydrogen atom or a moiety "Z" that conforms to formula (II) or (III), wherein each of R1, R2, R3, R4, and R5 represents a C1 to C10 alkyl group or a C1 to C10 hydroxyalkyl group; (iii) the average value for the number of Z moieties substituted on each phenyl ring in the polymer molecule is from 0.2 to 1.0; (iv) n is an integer with a value from 2 to 50; and (v) each polymer molecule contains at least one Z moiety.

Une surface de métal alumineux est amenée en contact à une température comprise entre 30 ~C et 65 ~C pendant 5 à 60 secondes avec un bain de traitement de surface, d'un pH de 2,0 à 6,5, qui contient un ion phosphate, un ion phosphate condensé, et un polymère hydrosoluble dans les proportions pondérales suivantes: 1 - 30 : 0,1 - 10 : 0,2 - 20. Cette opération est suivie d'un rinçage à l'eau et d'un séchage par chauffage. Le polymère hydrosoluble présente une structure chimique répondant à la formule (I) dans laquelle (i) X?1¿ et X?2¿ représentent chacun un atome d'hydrogène, un groupe alkyle C¿1?-C¿5?, ou un groupe hydroxyalkyle C¿1?-C¿5?; (ii) Y?1¿ et Y?2¿ représentent chacun un atome d'hydrogène ou un fragment "Z" qui répond aux formules (II) ou (III) dans lesquelles R?1¿, R?2¿, R?3¿, R?4¿, et R?5¿ représentent chacun un groupe alkyle C¿1?-C¿10? ou bien un groupe hydroxyalkyle C¿1?-C¿10?; (iii) la valeur moyenne pour le nombre de fragments Z substitués sur chaque noyau phényle dans la molécule polymère est compris entre 0,2 et 1,0; (iv) n est un entier d'une valeur comprise entre 2 et 50; (v) chaque molécule polymère renferme au moins un fragment Z.

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