Galvanized coatings fail by being consumed from the surface through some form of oxidation. In any given environment, this oxidation progresses at a steady rate for the life of the coating. In a stable environment, the rate of corrosion is also stable. By defining the expected rate of corrosion in any given environment, the service life of galvanized (and any zinc-based) coating can be determined. This is the basis of the INGAL Corrosion Mapping System. Extract from INGAL Specifiers
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