Quote:
Originally Posted by J8300
That frost color is the color of aluminum oxide
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The frosting is actually caused by microscopic cavitation by the Ultrasonic cleaning action itself. This type of cavitation can, and does pit the Aluminum because it is a very soft material, and not very dense. This type of erosion also takes place on Aluminum propellers on outboard motors. I've also seen it inside water pump housings on automotive water pumps. This type of action does not occur with heavier, more dense metals like brass, steel, and the like. I put this thread here because this type of cleaning is gaining in popularity among handgun shooters. Feel free to move it if you feel it would be better served elsewhere. Bill T.