NF EN ISO 9224

NF EN ISO 9224

March 2012
Standard Current

Corrosion of metals and alloys - Corrosivity of atmospheres - Guiding values for the corrosivity categories

ISO 9224:2012 specifies guiding values of corrosion attack for metals and alloys exposed to natural outdoor atmospheres for exposures greater than one year. It is intended to be used in conjunction with ISO 9223. Guiding corrosion values for standard structural materials can be used for engineering calculations. The guiding corrosion values specify the technical content of each of the individual corrosivity categories for these standard metals. ISO 9224:2012 provides examples of calculated maximum corrosion attack after extended exposure (up to 20 years) for six standardized corrosivity categories. It provides presumed average initial and steady-state corrosion rates of standard metals in intervals relative to six standardized corrosivity categories. It provides the calculation procedure for corrosion attack of steels in regard to their composition.

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Main informations

Collections

National standards and national normative documents

Publication date

March 2012

Number of pages

22 p.

Reference

NF EN ISO 9224

ICS Codes

77.060   Corrosion of metals

Classification index

A05-211

Print number

1 - 07/03/2012

International kinship

ISO 9224:2012

European kinship

EN ISO 9224:2012
Sumary
Corrosion of metals and alloys - Corrosivity of atmospheres - Guiding values for the corrosivity categories

ISO 9224:2012 specifies guiding values of corrosion attack for metals and alloys exposed to natural outdoor atmospheres for exposures greater than one year. It is intended to be used in conjunction with ISO 9223.

Guiding corrosion values for standard structural materials can be used for engineering calculations. The guiding corrosion values specify the technical content of each of the individual corrosivity categories for these standard metals.

ISO 9224:2012 provides examples of calculated maximum corrosion attack after extended exposure (up to 20 years) for six standardized corrosivity categories.

It provides presumed average initial and steady-state corrosion rates of standard metals in intervals relative to six standardized corrosivity categories.

It provides the calculation procedure for corrosion attack of steels in regard to their composition.

Replaced standards (2)
NF ISO 9224
June 2002
Standard Cancelled
Corrosion of metals and alloys - Corrosivity of atmospheres - Guiding values for corrosivity categories

NF EN 12500
October 2000
Standard Cancelled
Protection of metallic materials against corrosion - Corrosion likelihood in atmospheric environment - Classification, determination and estimation of corrosivity of atmospheric environments

Le présent document définit une classification de la corrosivité des environnements atmosphériques. Il ne peut être utilisé pour déterminer les catégories de corrosivité à partir de durées d'exposition inférieures ou supérieures à la première année.

Table of contents
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  • Avant-propos
    iv
  • Introduction
    v
  • 1 Domaine d'application
    1
  • 2 Références normatives
    1
  • 3 Termes et définitions
    1
  • 4 Principe
    2
  • 5 Prédiction de l'attaque par corrosion après une exposition prolongée
    2
  • 6 Critères spécifiques pour le calcul des vitesses de corrosion des métaux de construction
    3
  • 6.1 Aciers
    3
  • 6.2 Matériaux en zinc
    4
  • 6.3 Alliages de cuivre
    5
  • 6.4 Alliages d'aluminium
    5
  • 7 Expositions à long terme
    5
  • Annexe A (informative) Exemple d'attaque par corrosion maximale après des expositions prolongées pour les classes de corrosivité
    8
  • Annexe B (informative) Vitesses initiales moyennes de corrosion et vitesses stabilisées moyennes de corrosion dans les intervalles relatifs aux classes de corrosivité
    10
  • Annexe C (informative) Prédiction de l'attaque par corrosion des aciers en fonction de leur composition
    11
  • Bibliographie
    13
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