Stress corrosion on Al alloy 6082-T6 ?

Hi All
I just wanto to ask if someone has ever experienced stress corrosion
on Aluminium 6082-T6 alloy.
I am working on a strange problem, where I have a component made of
this alloy and a breakage occurs in a zone where there is an high
tensile stress (normal environment, no strange attacks or conditions
The fracture surface is fatigue similar (there is a black pit and next
some oxide waves propagating till critic section).
I had some component analyzed by a laboratory and they said this is
only fatigue because they did not find any corroding attack...but in
my opinion they were not sure about it !
What do you think ?
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I have seen SCC in high strength Al alloy bicycle parts with no notable chemical agent. The surface was scuffed to expose a reactive surface. Cracking was branched and ran in all directions.
Evidence for SCC in these circumstances can include the direction of the cracking. Fatigue is less inclined to branch and run at angles to the primary stress. (Although fatigue under reversing torsion can look a bit like SCC).
Some Al alloys will suffer SCC in water. (The same is true of some steels under the right conditions)
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