Passivation is a chemical reaction process achieving a very thin layer of oxidation that "seals" and delays or reduces further oxidation. Ultrasonic cleaning is a mechanical process using the cleaning fluid waves created by ultrasonic vibrations imparted to the vessel holding the fluid. The part is submerged in the fluid.
difference between passivation and ultrasonic clea
03/07/2006 8:04 AM
Passivation uses an acid bath to create a thin protective oxide layer on the surface (usually stainless steel and the acid is nitric at about 30 to 40%). This layer is also deplete of any free iron that may have been imparted by machining. The chromium content is somewhat increased at the surface, although a much better treatment exists to do this - electropolishing. Ultrasonic cleaning uses a vibrator running at ultrasonic frequencies to create minute bubbles and cavitations that loosen dirt from the surface of the metal. The solution is usually a bit basic and is a surfactant.
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Passivation
