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Aluminium discoloration

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neat2

Nuclear
Joined
Oct 8, 2008
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1
Location
ZA
When I clean Al plates (AA5754) with trichloroethylene (TCE), I experience discoloration, which I do not understand how it forms. I would like to know the mechanism of how the discoloration forms and how can I avoid it. For your information, I am using the right grade of TCE as recommended by the supplier and I have been using it for long time.
 
Perhaps the TCE is reacting with something on the surface of the aluminum plate. Do you know what coatings, lubricants, etc. are on the plate?
 
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