What is Passivation?
Passivation is a term for a variety of processes that make a metal or other substance unreactive, or passive, by altering the surface layer or coating the surface with a thin inert layer. Because ferrous metals flake when oxidized (e.g. rusts), anodizing is not an appropriate protection technique.
As a result, passivation is most commonly used for ferrous parts, especially stainless steel. For ferrous metals passivation removes free iron molecules embedded in the surface of the part and leaves a protective coating which protects the underlying material.
Properties and Benefits
- Prevents rust formation on ferrous parts, including stainless steel
- Prepares surface for other finishes, including priming and painting
- Reduces / prevents reactivity to other parts
Specs & Certifications
- QQ-P-35 --- NADCAP Approved, ROHS Compliant
- AMS-QQ-P-35 --- NADCAP Approved, ROHS Compliant
- FED-QQ-P-35 --- NADCAP Approved, ROHS Compliant
- AMS-2700 --- NADCAP Approved, ROHS Compliant
- ASTM A380 --- NADCAP Approved, ROHS Compliant
- ASTM A967 --- NADCAP Approved, ROHS Compliant
- ASTM B912 (Electropolish & Passivate) --- ROHS Compliant
- ASTM F8 --- ROHS Compliant
- MIL-C-13924 (Black Oxide Coating)
- MIL-DTL-13924 (Black Oxide Coating)
Applications / Industries
- Architectural, including Marine Architecture
- Food Preparation, Processing and Handling
In addition to our Passivation services, AOTCO plates and anodizes many exotic and uncommon Substrates that most plating providers won’t or can’t do. Please click to see a list of the Substrates we commonly plate.
If you’ve got a question about plating or other surface finishing, please reach out and speak with our experts to see how AOTCO can best help you.