What to put between steel and aluminum
When using stainless steel fasteners with aluminum surfaces, you can prevent corrosion by placing something between the two metals. Plastic or rubber washers or gaskets are good suggestions.
Along with corrosion, discoloration of stainless steel may occur when combined with aluminum. This is also called ‘tea staining’. Discoloration can be prevented by the use of insulation and regular maintenance. Passivation can also be used to create the passive film on the fastener for better corrosion resistance.
Personally experienced this in the Military with aluminum supperstructure on vessels ALUMINUM SCREES AND RIVETS SHOULD BE USED.
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