passivation
Pronunciation: pass-ih-VAY-shun
Chemical treatment that removes free iron and enhances the corrosion resistance of stainless steel instruments.
Full Definition
Passivation is a chemical treatment process that removes free iron contamination from stainless steel surfaces and promotes the formation of a protective oxide layer. In surgical instrument reprocessing, passivation helps prevent corrosion, staining, and pitting that can harbor microorganisms and compromise instrument function. The process typically uses nitric acid or citric acid solutions under controlled conditions. Passivation may be needed after aggressive cleaning, following welding repairs, or when instruments show signs of surface contamination. Regular passivation maintenance extends instrument life and ensures optimal performance.
Usage
Usage note: Distinguish from 'pickling' (removes oxide layers) and 'electropolishing' (surface smoothing).
In Context
- "The surgical instruments underwent passivation treatment to restore their corrosion resistance." — Maintenance service report
- "Passivation is recommended after citric acid cleaning cycles to maintain instrument integrity." — Technical service bulletin