passivation

/P AE1 S IH0 V EY1 SH AH0 N/

noun

1
(chemistry) The spontaneous formation of a hard non-reactive surface film (usually an oxide or nitride) that inhibits further corrosion.
2
(chemistry, materials science) The process of making a material passive (non-reactive) in relation to another material prior to using the materials together.
3
(control theory) Conversion of a non-passive dynamical system into a passive one.

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