TERMIUM Plus®

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

PIQURATION [4 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2015-04-08

English

Subject field(s)
  • Deterioration of Metals
  • Chemistry
  • Electrochemistry
DEF

A form of corrosion that is localised, as it does not spread laterally across an exposed surface rapidly, but that penetrates at 10 to 100 times the rate of general corrosion, usually at an angle of 90° to the surface.

CONT

Localized corrosion of passivated metals ... such as pitting, crevice corrosion and stress corrosion cracking ... is more dangerous and destructive due to its latent incubation and quick propagation ... Pitting is encountered most frequently in metallic materials of technological significance: [carbon,] low alloy and stainless steels, nickel base alloys, aluminum, titanium, copper, and many other metals and alloys ... [Severe pitting may occur] in different environments, especially in those containing chloride ions.

French

Domaine(s)
  • Altération des métaux
  • Chimie
  • Électrochimie
DEF

Type de corrosion localisée affectant les métaux passivés se propageant souvent à l’insu de l’observateur : les piqûres, de très petites dimensions, sont des indices d’un état avancé de corrosion qui peut continuer à se propager rapidement; une grande variété de métaux et d’alliages passivés d’usage courant peuvent subir une rupture de passivation dans des milieux divers, mais tout particulièrement lorsqu’ils sont en présence d’ions chlorure.

OBS

On distingue la corrosion par piqûres de la corrosion caverneuse (par crevasses) et de la corrosion sous contrainte, qui sont deux autres types de corrosions localisées affectant les métaux passivés.

OBS

corrosion par piquage : les termes piqûre ainsi que piqûration décrivent l'état de surface d’un métal et non pas le processus menant à cette corrosion. Or, l'usage du terme piquage sous-tend l'existence d’un agent qui «piquerait» le métal.

Spanish

Save record 1

Record 2 2015-01-06

English

Subject field(s)
  • Deterioration of Metals
DEF

Lowest value of the electrode potential at which pit initiation is possible on a passive surface.

OBS

In some countries the pitting initiation potential has been called "pitting potential", whereas in other countries the latter term refers to the potential achieved after pitting has become established.

OBS

Term and definition standardized by ISO.

Key term(s)
  • pitting potential

French

Domaine(s)
  • Altération des métaux
DEF

Valeur la plus basse du potentiel d’électrode permettant un amorçage de piqûres sur une surface passive.

OBS

Dans certains pays, le potentiel d’amorçage de piqûres s’appelle «potentiel de piqûration» tandis que dans d’autres, ce terme qualifie le potentiel atteint une fois la piqûration en œuvre.

OBS

Terme et définition normalisés par l’ISO.

Key term(s)
  • potentiel de piqûration

Spanish

Save record 2

Record 3 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.

Save record 3

Record 4 2006-10-24

English

Subject field(s)
  • Deterioration of Metals
DEF

Corrosion at discrete sites of the metal surface exposed to the corrosive environment.

OBS

Note - Localized corrosion may result in, for example, pits, cracks, grooves, etc.

CONT

Localized corrosion of passivated metals ... such as pitting, crevice corrosion and stress corrosion cracking ... is more dangerous and destructive due to its latent incubation and quick propagation.

OBS

Term and definition standardized by ISO.

French

Domaine(s)
  • Altération des métaux
DEF

Corrosion intervenant sur des sites discrets de la surface d’un métal exposé à un environnement corrosif.

OBS

La corrosion par piqûres(piqûration), la corrosion caverneuse(par crevasses) et la corrosion sous contrainte sont des corrosions localisées.

OBS

Note - La corrosion localisée peut, par exemple, apparaître sous formes de piqûres, fissures, sillons, etc.

OBS

Terme et définition normalisés par l’ISO.

Spanish

Save record 4

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