Zinc coatings have a higher chloride (Cl -) corrosion threshold (2-4 times) than that of uncoated steel, significantly extending the time until corrosion initiation. Once corrosion of the zinc coating does occur, the properties of the corrosion products and their ability to migrate into the concrete matrix reduces stress generation in the surrounding concrete, further extending the life of the reinforced concrete structure. Black and galvanized rebar corrosion performance in concrete can be shown graphically as :
Source: http://www.galvanizedrebar.com/corrosion_model.htm
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