Shortcomings of International Standard ISO 9223 for the Classification, Determination, and Estimation of Atmosphere Corrosivities in Subtropical Archipelagic Conditions—The Case of the Canary Islands (Spain)

• Main Authors: Juan J. Santana, Alejandro Ramos, Alejandro Rodriguez-Gonzalez, Helena C. Vasconcelos, Vicente Mena, Bibiana M. Fernández-Pérez, Ricardo M. Souto
• Format: Article
• Language: English
• Published: MDPI AG 2019-10-01
• Series: Metals
• Subjects: atmospheric corrosion; iso 9223; corrosivity categories; predictive models; archipelagic regions; canary islands
• Online Access: https://www.mdpi.com/2075-4701/9/10/1105
• ISSN: 2075-4701

The classification, assessment, and estimation of the atmospheric corrosivity are fixed by the ISO 9223 standard. Its recent second edition introduced a new corrosivity category for extreme environments CX, and defined mathematical models that contain dose−response functions for normative corrosivity estimations. It is shown here that application of the ISO 9223 standard to archipelagic subtropical areas exhibits major shortcomings. Firstly, the corrosion rates of zinc and copper exceed the range employed to define the CX category. Secondly, normative corrosivity estimation would require the mathematical models to be redefined introducing the time of wetness and a new set of operation constants.