Reply To: Aluminium corrosion / rust.

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Electrolytic corrosion where aluminium and steel is a major problem on things like Land Rover especially when salt is added. One problem painting aluminium is getting a clean surface, an etch primer is essential.

Read an interesting article a while back warning against using a copper based anti seize compound such as Copaslip on steel bolts going into aluminium castings as it introduced a third element into the electrolytic corrosion equation. Have to plead guilty to that in the past. This particular article concerned Hillman Imp head bolts and the author’s recommendation to prevent thread galling was a drop of EP gear oil.