----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----
Hi All....
Perhaps....
The initial construction of Coupes right after the
war used war surplus aluminum sheet or extrusions. As theses stocks quickly
ran out (many different manufacturer were building planes then) recycled (as we
know the term today) aluminum was used to manufacture new stocks of sheet and
extruded aluminum. Problem might have been that not all of the impurities of the
recycled metal were removed or that the combinations for the specific grades of
aluminum were correct. Ending up in slightly substandard grade
aluminum.
Intergranular corrosion forms from the inside out
of the metal, as I believe, and it is usually caused by the grade of
material or forming process.
Just thinking out load.
Cheers
BobP
============================================================================== To leave this forum go to: http://ercoupers.com/lists.htm
