Question

How to prevent galvanic corrosion between aluminum and steel?

Answer 1

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Anodising is one way to break the circuit. The anodic coating is made up of aluminium oxide, which is a good electrical insulator. The oxide layer is a thousand times thicker than the natural oxide that forms on aluminium, which offers essentially no galvanic protection.

Answer 2

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Anodising is the way used to prevent galvanic corrosion between aluminum and steel.