passivation

Noun

Meaning

(chemistry, materials science) The process of making a material passive (non-reactive) in relation to another material prior to using the materials together.

(chemistry) The spontaneous formation of a hard non-reactive surface film (usually an oxide or nitride) that inhibits further corrosion.

(control theory) Conversion of a non-passive dynamical system into a passive one.

Examples

During combustion, vanadium oxidizes and reacts with sodium and sulfur, yielding vanadate compounds with melting points as low as 530 °C, which attack the passivation layer on steel and render it susceptible to corrosion. Source: Internet

If left unattended, rust spots may compromise surface passivation and may spread internally. Source: Internet

Part of the reason for the slowness of the calcium–water reaction is a partial passivation (chemically protective coating) of insoluble white calcium hydroxide ; in acidic solutions, where this compound is more soluble, calcium reacts vigorously. Source: Internet

Because the carbon dioxide feed is recovered from ammonia synthesis gas, it contains traces of hydrogen that can mingle with passivation air to form an explosive mixture if allowed to accumulate. Source: Internet

Coating Metals can be coated with paint or other less conductive metals ( passivation ). Source: Internet

In highly acidic solutions, aluminium reacts with water to form hydrogen, and in highly alkaline ones to form aluminates — protective passivation under these conditions is negligible. Source: Internet

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