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John Doe

wrote:

On Mar 1, 10:05 am, John Doe wrote:
For a small surface (2" x 2") area course roughening of aluminum.

The steel brush drill attachment I'm using requires pressing hard
to produce significant scratch marks. Is there a particular type
of steel brush that will easily roughen aluminum?

Don't use a steel brush. The steel bristles will leave small
amounts of iron in the aluminum and corrosion will set in
shortly. Iron and aluminum don't get along well at all. Some form
of grit (not emery; it contains iron in its makeup) is better.
Aluminum oxide is best, I'd think.

Dan

Does that corrosion require interaction with the environment? I have
read something like that here before about steel on aluminum
corrosion, and mentioned it to a friend who then posed that
question. Thanks.