NF EN ISO 9223

NF EN ISO 9223

March 2012
Standard Current

Corrosion of metals and alloys - Corrosivity of atmospheres - Classification, determination and estimation

ISO 9223:2012 establishes a classification system for the corrosivity of atmospheric environments. It defines corrosivity categories for the atmospheric environments by the first-year corrosion rate of standard specimens, gives dose-response functions for normative estimation of the corrosivity category based on the calculated first-year corrosion loss of standard metals, and makes possible an informative estimation of the corrosivity category based on knowledge of the local environmental situation. ISO 9223:2012 specifies the key factors in the atmospheric corrosion of metals and alloys. These are the temperature-humidity complex, pollution by sulfur dioxide and airborne salinity. The temperature-humidity complex can be evaluated in terms of time of wetness. Corrosion effects of other pollutants (ozone, nitrogen oxides, particulates) are not considered decisive in the assessment of corrosivity according to ISO 9223:2012. ISO 9223:2012 does not characterize the corrosivity of specific service atmospheres, e.g. atmospheres in chemical or metallurgical industries.

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Main informations

Collections

National standards and national normative documents

Publication date

March 2012

Number of pages

23 p.

Reference

NF EN ISO 9223

ICS Codes

77.060   Corrosion of metals

Classification index

A05-210

Print number

1 - 07/03/2012

International kinship

ISO 9223:2012

European kinship

EN ISO 9223:2012
Sumary
Corrosion of metals and alloys - Corrosivity of atmospheres - Classification, determination and estimation

ISO 9223:2012 establishes a classification system for the corrosivity of atmospheric environments. It

  • defines corrosivity categories for the atmospheric environments by the first-year corrosion rate of standard specimens,
  • gives dose-response functions for normative estimation of the corrosivity category based on the calculated first-year corrosion loss of standard metals, and
  • makes possible an informative estimation of the corrosivity category based on knowledge of the local environmental situation.

ISO 9223:2012 specifies the key factors in the atmospheric corrosion of metals and alloys. These are the temperature-humidity complex, pollution by sulfur dioxide and airborne salinity.

The temperature-humidity complex can be evaluated in terms of time of wetness. Corrosion effects of other pollutants (ozone, nitrogen oxides, particulates) are not considered decisive in the assessment of corrosivity according to ISO 9223:2012.

ISO 9223:2012 does not characterize the corrosivity of specific service atmospheres, e.g. atmospheres in chemical or metallurgical industries.

Replaced standards (2)
NF ISO 9223
June 2002
Standard Cancelled
Corrosion of metals and alloys - Corrosivity of atmospheres - Classification

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
    2
  • 4 Symboles et termes abrégés
    3
  • 4.1 Symboles
    3
  • 4.2 Termes abrégés
    3
  • 5 Classe de corrosivité de l'atmosphère
    3
  • 6 Classification de la corrosivité de l'atmosphère
    3
  • 7 Détermination de la corrosivité en fonction des mesurages de vitesse de corrosion sur des éprouvettes de référence
    4
  • 8 Estimation de la corrosivité basée sur des informations sur le milieu environnant
    5
  • 8.1 Estimation de la corrosivité - Généralités
    5
  • 8.2 Estimation normative de la corrosivité basée sur les pertes par corrosion calculées sur la première année
    5
  • 8.3 Estimation informative de la corrosivité basée sur la description des conditions d'exposition
    6
  • Annexe A (informative) Sources d'incertitude associées à la détermination et à l'estimation de la corrosivité des atmosphères
    7
  • Annexe B (informative) Caractérisation de l'atmosphère en fonction de sa corrosivité
    9
  • Annexe C (informative) Description d'environnements atmosphériques types liés à l'estimation des classes de corrosivité
    13
  • Bibliographie
    15
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