Heavy corrosion deposits on clad aluminium alloys should be removed
- chemically by use of phosphoric acid.
- chemically by use of trichloroethylene.
- mechanically using a pneumatic vibrator.
Explanation
On clad aluminium the thin pure-aluminium cladding must be preserved, so heavy corrosion is removed chemically using a phosphoric-acid based treatment that dissolves the corrosion and passivates the surface without cutting into the protective cladding. Mechanical vibrators risk removing the cladding, and trichloroethylene is a degreasant, not a corrosion remover.
Diverdeep asking:
usually, in heavy deposits corrosion, the initial phase is remove the bulk with a brass wire wheel and than use the acid
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