Conversion coatings for metal surfaces

Details Conversion coatings for metal surfaces Conversion coatings for metal surfaces

C - Chemistry, Metallurgy

23

C

C23C 22/36 (2006.01) C23C 22/34 (2006.01) C23C 22/80 (2006.01)

Patent

CA 2172367

A conversion coating for aluminum, ferrous and magnesium alloyed materials includes zirconium, fluoride and calcium ions. The coating is preferably at a pH of between about 2.6 and about 3.1, and may optionally include phosphates, polyphosphates, tannin, boron, zinc and aluminum. A sequestering agent to complex dissolved iron, and a crystal deformation agent such as ATMP are also preferably included.

Un revêtement par conversion pour matériaux d'alliage d'aluminium, de fer et de magnésium comprend des ions de zirconium, de fluorure et de calcium. De préférence, ce revêtement a un pH compris entre environ 2,6 et environ 3,1 et il peut, le cas échéant, comprendre des phosphates, des polyphosphates, du tannin, du bore, du zinc et de l'aluminium; il peut également comprendre un agent séquestrant pour la formation d'un complexe avec du fer dissous ainsi qu'un agent de déformation de cristaux tel que l'acide nitrilotris(méthylène)triphosphonique (ATMP).

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