Hydrophilic coatings for aluminum

Details Hydrophilic coatings for aluminum Hydrophilic coatings for aluminum

C - Chemistry, Metallurgy

23

C

C23C 22/36 (2006.01) C23C 22/34 (2006.01) C23C 22/80 (2006.01) F28F 13/04 (2006.01)

Patent

CA 2172375

A conversion coating for aluminum finstock includes zirconium, fluoride and potassium ions. The coating is preferably at a pH below about 2.0, and may optionally include polyphosphates, tannin, boron and zinc. A sequestering agent to complex dissolved iron, and a crystal deformation agent such as ATMP are also preferably included.

Un revêtement par conversion pour tôles à ailettes en aluminium comprend des ions de zirconium, de fluorure et de potassium. De préférence, ce revêtement a un pH inférieur à environ 2,0 et il peut, le cas échéant, comprendre des polyphosphates, du tannin, du bore et du zinc; il peut également comprendre un agent séquestrant pour la formation de complexes avec du fer dissous ainsi qu'un agent de déformation des cristaux tel que l'acide nitrilotris(méthylène)triphosphonique (ATMP).

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