Hard Anodising of high silicon content aluminum alloys
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I need to put a thick oxide layer ( more than 30 microns ) when hard anodising high silicon content ( over 10%) aluminum alloys .
These alloys are used by the foundries . Typically in the US it would be a 390 alloy .
Has anybody an idea of how to do that ?
All the tests we have done so far have resulted in an oxide layer thickness under 10 microns .
Thanks for your input .Eric LABORDE
The devil is in the details, Eric, but in general the way you get thick hard coatings, is to keep the temperature way down (25-32 degrees F. / -4 to 0 degrees F.), and apply high voltages (50 or more volts is not uncommon). But that is a great deal of silicon and certainly sounds like a problem :-(
Ted Mooney, P.E.
Pine Beach, New Jersey
You need a specialty chemistry hardcoat system for high copper alloysDavid A. Kraft
- Long Island City, New York
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