SURFACE FINISHING
Passivation
Passivation enhances appearance and functionality. For a very long time, it keeps the material from rusting.
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Introduction
The passivation process is done by dipping the parts into the acidic bath of metal oxides. It is done for parts made with Steel and its alloys. Passivation enhances appearance and functionality. For a very long time, it keeps the material from rusting.
In essence, it also creates fragile oxide layers of protection on the surface. After Passivation, other finishing processes like painting and polishing are also made easy and effective. Additionally, it treats the parts’ minor surface flaws.
key properties
| Features | Info |
|---|---|
| Materials | Stainless Steel |
| Color | n/a |
| Texture | Matte |
| Standards |
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Identify stainless grade, cleaning condition and verification requirement
Passivation specifications should state the stainless grade, prior machining or welding condition, required cleaning/preparation, treatment route, protected surfaces and the verification evidence expected for the part or batch.
Engineering data to lock before release
| Material basis | Stainless grade, condition and fabrication history |
|---|---|
| Preparation | Oil, scale, free-iron or heat-tint removal requirement |
| Treatment scope | Areas treated, masked interfaces and handling limits |
| Verification | Specified test method, visual review or documentation |
Passivation should be specified as part of a complete surface-preparation sequence, not as a substitute for choosing an appropriate stainless grade.
