PASSIVATION
Passivation is a process used to enhance the corrosion resistance of metals, particularly stainless steel and other alloys. The goal of passivation is to create a protective oxide layer on the metal surface, which helps prevent rust and corrosion.
Here's how passivation works and why it's important:
1. Purpose of Passivation: The primary purpose of passivation is to remove free iron and other contaminants from the surface of stainless steel and promote the formation of a chromium-rich oxide layer. This oxide layer acts as a barrier, protecting the underlying metal from corrosion in various environments.
2. Mechanism: Passivation typically involves cleaning the metal surface thoroughly to remove dirt, grease, oils, and any traces of free iron or iron-containing contaminants. After cleaning, the metal is exposed to an oxidizing acid solution, usually nitric acid or citric acid. This acid solution facilitates the formation of the protective oxide layer.
