passivation

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Related to passivations: Passivation layer

passivation

[‚pas·ə′vā·shən]
(electronics)
Growth of an oxide layer on the surface of a semiconductor to provide electrical stability by isolating the transistor surface from electrical and chemical conditions in the environment; this reduces reverse-current leakage, increases breakdown voltage, and raises power dissipation rating.
(metallurgy)
To render passive; to reduce the reactivity of a chemically active metal surface by electrochemical polarization or by immersion in a passivating solution.

passivation

Treatment of a metal surface which leaves a protective coating, rendering the surface less reactive chemically.
References in periodicals archive ?
We verified the passivation's condition by SEM (see Figure 3).
The trivalent chromium passivation is generated by deposit of the metal ions in the solution with elevated pH.
The passivation layer has peeled off in some areas - it is easy to imagine these samples will have lower corrosion resistance.
The option we selected was adding a chelating agent into the passivation solution to stabilize the dissolved ions in the solution.
Finally, it can be seen that the passivation layer's construction is almost same as the new solution's passivation.
Considering the appearance, excess organic carboxylic acid causes tarnish of the passivation surface.
As a result, the first reaction of passivation (dissolving zinc plating) may be accelerated.
Additionally, accelerating the dissolving reaction shortens the solution's life and increases the cost of the passivation process.
The increase of the concentration of dissolved ions in the passivation solution over time leads to the deposit of these ions in the passivation layer, causing the corrosion resistance after heating to decrease by generating cracks.
The extra cost of the top coating solution is not needed when using this passivation.
Apply baking process for hydrogen embrittlement relief after passivation