On Mar 8, 2:55�pm, "Wild_Bill" wrote:
I'm glad you brought up this topic, Bob. Every time I enounter this powdery
effect on aluminum, I think "the RCM'ers would know what causes this, and
what to do about it", but then I forget.

Since Mike H said not to use any sort of base on aluminum, I thought I'd
look for some examples of common compounds will cause the erosion reaction.