Aqueous surface conditioner and surface conditioning method...

Details Aqueous surface conditioner and surface conditioning method... Aqueous surface conditioner and surface conditioning method...

C - Chemistry, Metallurgy

23

C

C23C 22/78 (2006.01)

Patent

CA 2434306

An aqueous surface conditioner for use in a phosphating treatment is provided which contains crystals having an average diameter of 5 µm or less in an amount of at least 0.1 g/L. The crystals are selected to have a two- dimensional epitaxy that matches within 3 % of misfit with the crystal lattice of one phosphate coating selected from among (1) hopeite /Zn3(PO4)2.4H2O) and/or phosphophyllite (Zn2Fe(PO4)2.4H2O), (2) scholzite (CaZn2(PO4)2.2H2O) and (3) hureaulite (Mn5(PO4)2[PO3(OH]2.4H2O).

L'invention concerne un agent aqueux de préparation de surface, destiné à être utilisé dans un traitement au phosphate, contenant des cristaux de diamètre moyen inférieur ou égal à 5 µm, dans une proportion d'au moins 0,1 g/l. On choisit les cristaux pour qu'ils aient une épitaxie bidimensionnelle correspondant, avec un pourcentage d'inadaptation de 3 %, au réseau cristallin d'un revêtement au phosphate sélectionné parmi les revêtements suivants: (1) hopéite (Zn¿3?(PO¿4?)¿2 ?. 4H¿2?O) et/ou phosphophyllite (Zn¿2?Fe(PO¿4?)¿2 ?. 4H¿2?O), (2) scholzite (CaZn¿2?(PO¿4?)¿2 ?. 2H¿2?O) et (3) hureaulite (Mn¿5?(PO¿4?)¿2?[PO¿3 ? (OH)]¿2?.4H¿2?O).

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