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What does passivation mean?

Looking for the meaning or definition of the word passivation? Here's what it means.

Noun
  1. (chemistry) The process of making a material passive (non-reactive) in relation to another material prior to using the materials together.
  2. (chemistry) The spontaneous formation of a hard non-reactive surface film (usually an oxide or nitride) that inhibits further corrosion.
  3. (control theory) Conversion of a non-passive dynamical system into a passive one.
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Examples
A final passivation layer is added to the top of the wafer to seal it from water and other contaminants.
This effect is related to the oxide layer used for passivation of the silicon surface.
In electroplating, yellow chromatising of aluminium was replaced by chromide Al1650 for thick layer passivation of aluminium.
A drain electrode layer is formed by a first passivation film with the first passivation film formed as an upper layer.
When controlling a passivation bath in accordance with DIN 51360, you achieve clarity of whether the passivation is optimal.
Finishing is carried out by means of chemical pickling with nitric acid and chromic passivation.

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