This protective treatment is applicable only on the aluminium and its alloys.

It is ideal as a pre-varnishing film.

Because of its chrome-aluminium oxides and salts, the chromate film enables the items to resist against the corrosive agents and ensures also a good corrosion-proof against some aggressive chemical agents e.g. the concentrated nitric acid.

It concerns the aluminium surface converting to a gold-yellowish mixed aluminium chromate and oxides.

It preserves the electric conductivity of the item and it gives rise a good looking to the whole surface.