Metal Finishing – Plating & Coating
Stainless Steel Passivation
Removal of free iron from stainless surfaces and reinforcement of the passive chromium-oxide layer; restores corrosion resistance.
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Process
The surface of corrosion-resistant steels is passivated to form a protective film. The surface is cleaned, free iron removed, and a corrosion-resistant finish achieved.
What it provides
- Smooth surface appearance
- Oxidation-resistant surface
Frequently asked questions
Which stainless grades are passivated?
300 and 400 series, precipitation-hardened (17-4 PH) and duplex stainless; acid type (nitric or citric) and time are chosen per grade to AMS-2700 / ASTM-A967.
How is passivation verified?
By the water immersion, high humidity or copper sulphate tests in ASTM-A967; the result is on the report.
Have a drawing for this process?
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