Surface preparation for aluminium

Details Surface preparation for aluminium Surface preparation for aluminium

C - Chemistry, Metallurgy

23

C

148/23, 117/28

C23C 22/56 (2006.01) C23C 22/66 (2006.01) C23C 22/82 (2006.01)

Patent

CA 2012413

ABSTRACT SURFACE PREPARATION FOR ALUMINIUM Solutions of hydrogen peroxide in sulphuric acid are used to treat aluminium metal, to form an artificially applied oxide layer having a profiled surface with protrusions which is very suitable for adhesive bonding or the application of organic coatings. A copper salt may be used as an accelerator, alone or with an amine. Treatment may be effected at temperatures up to 90°C. An inorganic coating may be applied to overlie and protect the profiled oxide layer. An advantage is the possibility of using aluminium metal without a prior cleaning step.

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