Additional information: Aluminium

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Etching and desclaing of aluminium

Descaling and pickling are not normally applied to aluminium processing because may not be necessary as part of a pretreatment but as a consequent.

The etching of aluminium and its alloys is usually carried out in sodium hydroxide solutions, fluorides being added as necessary. Zincate treatment is necessary for good adhesion prior to autocatalytic or electrolytic metal plating. This solution is based on sodium hydroxide containing <20g/l zincates.

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