TERMIUM Plus®

The Government of Canada’s terminology and linguistic data bank.

PASSIVE STATE [1 record]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2010-02-23

English

Subject field(s)
  • Electrochemistry
  • Electrometallurgy
  • Inspection of Surfaces (Materials Engineering)
DEF

The condition of a metal surface that retards its normal reaction in a specified environment and is associated with the assumption of a potential more noble than normal.

CONT

The passivity of metals and alloys is one of the most important phenomenon responsible for out metal-based civilization. Most structural metals are viable in an engineering sense only because of the existence of a surface oxide film whose thickness may be less than a few nanometers. Although the phenomenon of passivity has been known for more than 150 years, a satisfactory description of the passive state still eludes us.

OBS

Passivity breakdown often leads to pitting.

OBS

The term passivity is sometimes used for surfaces covered by very thin films of phosphate or chromate, such as are formed by immersion in solutions containing phosphoric acid and/or chromic acid. This usage is incorrect and is discouraged.

OBS

passivity; passive state: Terms and definition standardized by ISO.

PHR

Passivity breakdown.

French

Domaine(s)
  • Électrochimie
  • Électrométallurgie
  • Contrôle des états de surface des matériaux
DEF

Condition du métal dans lequel la corrosion électrochimique est empêchée par certains états de surface.

OBS

La rupture de passivité peut mener à la piqûration.

OBS

On englobe parfois dans cette définition l'état d'une surface recouverte d'un film très mince de phosphate ou de chromate, tel qu'il se forme par immersion dans des solutions contenant de l'acide phosphorique et/ou de l'acide chromique. Cet usage est incorrect et n'est pas recommandé.

OBS

passivité; état passif: termes et définition normalisés par l'ISO.

OBS

Rupture de passivité.

Spanish

Campo(s) temático(s)
  • Electroquímica
  • Electrometalurgia
  • Control del estado de la superficie de los materiales
DEF

Carácter del metal que, merced a tratamientos superficiales, resiste a la erosión electroquímica.

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