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This document specifies an annual severity classification system for atmospheric corrosion using continuous electrochemical measurements. The continuous atmospheric corrosion measurements include the local environment, single-alloy free corrosion, and galvanic corrosion, as specified in ISO 22858.
It is applicable to the environmental severity and corrosivity of exposure conditions found within laboratory test chambers, outdoor exposure sites, and service environments5. It specifies the classification of an exposure condition based on the local environmental severity (alloy-independent) or corrosivity (alloy-dependent), including an alloy and galvanic couple. The addition of other alloys or galvanic couples for determining annual severity is specified.
This document specifies an annual severity classification system using environmental severity or corrosivity measurements.
This document is not applicable to the severity classification of indoor environments, which is specified in ISO 11844-1, ISO 11844-2, and ISO 11844-3, nor does it address the corrosion management planning of applicable environments, based on the severity classification of an exposure condition.
Electrochemical measurements for atmospheric corrosion have been developed and standardized over the last few decades. The measurement technology has reached maturity where it is a commercial product being used in a wide range of industries including energy, transportation, and infrastructure for assessing corrosion severity. These measurement products address market needs for continuous monitoring of corrosion severity for materials selection, digital engineering, and asset management. These products are important to small and medium sized businesses and the new work item capability for classification of severity is significant to large industry and governmental organizations. The standard will support adoption and market expansion for these innovative technologies and improve international market access for producers. More effective design and maintenance of structures, systems, and assets to resist atmospheric corrosion serves the sustainability development goals for innovations and responsible consumption and production. The intended use of the measurements and classification standard is to assess corrosion severity for geographic locations and for monitoring assets to improve materials selection and maintenance. The metrics for standard impact include sales of measurement systems, number of measurement producers, and number of users and industries adopting the classification system.
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