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    Improvement of the ISO classification system based on dose-response functions describing the corrosivity of outdoor atmospheres

    Published: 01 January 2002

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    The investigation on the effects of environmental parameters on the atmospheric corrosion of technical metals performed in several field and laboratory exposures starting from the 1930's have created a basis for classification of the corrosivity of atmospheres. The present ISO 9223 “Corrosion of metals and alloys — Corrosivity of atmospheres — Classification” standard was at the time of its development in the 1970–80's a big step forward as it was the first classification system describing the corrosivity categories in a quantitative way. The standard has found a broad application and has been adopted in other national and international standards. It was mainly based on data from the temperate regions of Europe and Northern America, which were available at that time. Since the publication of the standard certain limitations have become obvious and many remarks concern limitations with respect to covering climatic influences. This paper will focus on the development of dose-response functions describing the corrosivity of outdoor atmospheres and the possible improvements that can be made of the standard using the developed functions.


    atmospheric corrosion, dry deposition, modelling, SO, 2, chloride, time of wetness, temperature

    Author Information:

    Tidblad, J
    Swedish Corrosion Institute, Stockholm,

    Kucera, V
    Swedish Corrosion Institute, Stockholm,

    Mikhailov, AA
    Institute of Physical Chemistry, Russian Academy of Sciences, Moscow,

    Knotkova, D
    SVUOM Praha a. s., CZ

    Committee/Subcommittee: G01.04

    DOI: 10.1520/STP10884S