Jim Miller wrote:
there is another type of coating for aluminum called alodyne
which protects the same way as anodizing but is electrically
conductive.


Alodine (R) coatings are not conductive. You can specify a "type 3"
coating that is thin enough that fasteners will usually punch through
the coating layer.

See MIL-C-5541 chromate conversion coatings.

Kevin Gallimore

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