How can aluminum alloy black oxidation be black and bright

Black matte can be sandblasted before oxidation to form a matte surface, which becomes matte black after oxidation coloring.

Aluminum alloy surface oxidation coloring

The oxidation coloring is divided into two steps, the first step is to use the traditional chromate oxidation process, chemical oxidation of the pre-treated workpiece in time, so as to avoid re-pollution or the formation of new natural oxide film, the process specifications are as follows:

Na2CrO418 g/L

Na2CO45 g/L

NaOH4g/L

Na3PO48g/L

Theta 60 ~ 70 ℃

t10 min

After this step, the oxide film with corrosion resistance basically up to standard can be obtained.

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