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Letter 40034
Pitting in 2024-T4 used in aerospace
[Canada]
March 23, 2006
Hi,
Just a question, has anyone ever experienced pitting corrosion in the
2024-T4 material. EDS shows that chlorides are present in the pits.
Is it the process line, or something else.
Your help would so greatly appreciated.
Jason Sighn
aerospace - Vancouver, BC, CA
March 26, 2006
Chlorides from dragged in tap water and/or fluorides from
proprietary products anywhere in an aluminum treatment process line
will cause pits. This is agravated by the galvanic action between
titanium racks and stainless steel tanks or heaters.
In old 2024 or heat treated 2024, the copper has migrated to the
grain boundaries, where it is more rapidly picked out by chlorides
and/or galvanic action, thus leaving behind pits.
Do a labaratory line with beakers, D.I.water, and fresh make-ups, and
see if you can confirm what I have said above.
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