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According to different standards, the corrosion grade have different classification, such as according to the long-term corrosion of various media on building materials, can be divided into strong corrosion, medium corrosion, weak corrosion, no corrosion four grades, of which a variety of media at the same time, the corrosion grade should be the highest. According to the “ISO12944 corrosion environment criteria”, the corrosion degree of the atmospheric environment on the exposed steel plate can be divided into the following five levels – C1, C2, C3, C4, C5-I, C5-M, of which C1, C2, C3 are light corrosion protection, and the corrosion protection requirements are low.
The anti-corrosion level above C4 is higher, and it is generally has a high salinity and humidity environment, which in paper mills, chemical plants, power plants and other commonly used C4 grade anti-corrosion, C5 is commonly used in marine areas and other high-corrosion environment, such as offshore drilling platforms. Refrigeration equipment used in such environments requires special equipment to ensure its normal operation.
