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Cleaning cooland and oils from cavities and extrusions


An issue has come up where a customer noticed an oil substance seeping from the end of a machined extrusion.  The extrusion is cut to length and several holes drilled & tapped along its length.  The parts are not specifically cleaned to remove any residue, but I am told they are baked to drive off any volatiles,  temp & time unknown, and then powder coated & baked at 380°F for 10 – 15 minutes.  Still, there is the seepage occurring after several weeks or even months.

I do know that coolants and oils can be over-baked and will polymerize, forming a tough, gooey coating.  But typical synthetics are very high-temperature creatures!

What does anyone know about similar problems and fixes?  I have several ideas, but want to get more ideas before I re-invent a set of wheels…

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