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Letter 27028
Detecting thin aluminum phosphate coating
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For electrolytic capacitor, the aluminum foil always reacts with
water to form oxide. So, some manufacturer will put the foil in
phosphoric acid to form a protective layer (aluminum phosphate). So,
how to detect this layer? what kind of method can be use?
I got a sample with a very thin (about 10um) coating of aluminum
phosphate. Does anyone know how to detect this coating?
El Nina
Student - Hong Kong
August 23, 2006
Surface phosphorous on aluminum is detectable and measurable using
EDAX - also, the aluminum phosphate is a dielectric and a measurement
of impedance through the aluminum will correlate with the amount of
aluminum phosphate on the surface- are commercial samples of the
treated foil available?
David Hanke
- San Marcos, California, USA
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