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"How to recognize passivation frosting?"
Current question:April 7, 2021
Q. Can you help my understanding by some pics of accept and reject passivated steel surfaces?Sony KNV
- Hyderabad India
Previous closely related Q&A's starting in:2004
Q. Passivation specs require the parts to show no "frosting". How can someone distinguish unacceptable surface frosting due to poor passivation from a surface given a media finish opeartion prior to passivation that leaves a matte finish another person might call "frosted"?Fred Cone
aerospace manufacturing - West Palm Beach, Florida, USA
A. "No frosting" is referring to an etching of the material, typically from contaminants in the acid -- chloride comes to mind. Ferric chloride from using tap water and the dissolved iron in a well-used bath will definitely do it. Trust me, you will know it when you see it. It literally looks like frost, which is quite different from a blasted surface.James Watts
- Navarre, Florida