Understanding Passivation In Dental Alloys

Write a short note on the passivation of metals.
Answer:

Passivation of metals:

Certain metals readily form strong adherent oxide films on their surface which protect them from corrosion.
- Such metal is said to be passive.
- Chromium, titanium, and aluminum are examples of such metals.
If more than 12 % chromium is added to iron or cobalt, we get stainless steel or cobalt-chromium alloys which are lightly corrosion-resistant and therefore suitable for dental use.
Since this film is passive to oxidative chemical attack, the formation of such an oxide layer is called passivation.
The degree is passivity is influenced by a number of factors such as alloy composition, stress in the appliance, and the environment in which it is placed.

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