EN ISO 9223:2012

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
5 Category of corrosivity of the atmosphere
6 Classification of corrosivity of the atmosphere
7 Corrosivity determination based on corrosion
  rate measurement of standard specimens
8 Corrosivity estimation based on environmental information
Annex A (informative) - Sources of uncertainty associated
        with the determination and estimation of
        atmospheric corrosivity
Annex B (informative) - Characterization of the atmosphere
        in relation to its corrosivity
Annex C (informative) - Description of typical atmospheric
        environments related to the estimation of
        corrosivity categories
Bibliography

ISO 9223:2012 establishes a classification system for the corrosivity of atmospheric environments. Itdefines 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, andmakes 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.