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unfreezing aluminum oxide?
I talked to one of the MEMS process guys here at work, where alumminum oxide is used as a dielectric material. Industry uses a 30% solution of Potassium Hydroxide (KOH) by weight in water, heated to 80 degrees celcius to etch aluminium oxide.
Etch rates are around 800 Angstroms per minute. There are 10,000 Angstroms in one micrometer, and twenty five micrometers in .001 inches.
I estimate that etching 1/64" would take 3.3 days in a heated solution. And I don''t know what else would get etched, or if it eats the base aluminuim material.
Now that I have gone over the technical top...the guy who runs the boat yard I''m in told me that they soak jackstand screws in hydraulic fliud to remove rust and free the adjusting nuts. The hydraulic fluid has a rust inhibitor in it to keep hydraulic pistons from corroding.
Good Luck - Doug