Note: the above is an excellent guide for a majority of paint systems, but does not take into account specific chemical, temperature or mechanical needs.Ī separate set of risk categories are given for exposure to water or soil. The ISO 12944:2018 (Part 2) standard broadly splits environmental corrosion risk into six categories, based on the time needed for untreated zinc or carbon steel to corrode under various atmospheric conditions: To cover those variations, the International Organisation for Standardisation (ISO) define standards governing corrosion resistant paint systems.Ĭorrosion Risk From Environmental Exposure The location of steelwork above or below ground, the pH level of the surrounding environment and the presence of microorganisms also affect susceptibility to corrosion. This means environmental conditions have an important effect on your plant/steelwork. Corrosion occurs when moisture, oxygen, and ferrous steel combine to cause oxidation – a process accelerated by surface pollutants. Your steel plant and structures are only as durable as they are corrosion resistant, but corrosion prevention is no simple task.
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