What Is Fastener Surface Treatment Passivation?

Passivation is a process used to enhance the corrosion resistance of metal surfaces, including fasteners. The purpose of passivation is to create a protective oxide layer on the metal surface, which helps prevent corrosion and rust.

In the context of fasteners, passivation is often applied to stainless steel or other corrosion-resistant alloys. Stainless steel contains chromium, which naturally forms a thin oxide layer on its surface, providing corrosion resistance. However, during manufacturing processes like machining, this oxide layer can be compromised.

Passivation involves removing any contaminants and iron particles from the surface of the metal and then promoting the formation of a more stable and protective chromium oxide layer. This is typically done using a chemical treatment, often involving nitric acid or citric acid.

The passivation process helps ensure the longevity and corrosion resistance of the fasteners, making them more suitable for use in environments where exposure to moisture or harsh conditions could lead to corrosion.

It’s worth noting that the specific details of the passivation processes can vary based on the type of metal and the intended application of the fasteners.

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