----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----Hi Jim,
What you describe does sound like exfoliation corrosion. It has a peeling
appearance like an onion skin. Usually you can grasp a piece with
needle-nose pliers and just peel it right off the surface. I found the same
corrosion in my center section on the inside spar cap face just above the
main gear attachment bolts. I believe it is due to dissimilar metals. I
have heard of people taking the exfoliation off down to clean shiny metal and
repairing just as you have done. Would still require inspection and sign-off
by an IA, I believe.
Jim
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