Zinc as a material and element is used in the construction. Corrosion of steel reinforced concrete affects everyone, leading to expensive repairs and intensive maintenance programs. Budgeting of repairs and maintenance programs becomes difficult when structures do not meet their intended life cycle requirements. Corrosion of reinforcing steel in concrete structures leads to concrete failure, impacting the public with delays and detours.

Zinc coatings passivate very quickly when exposed to fresh concrete, which enhances the long-term corrosion protection of the galvanized reinforcements during years of service. The initial passivation of a zinc coating, when embedded in concrete, occurs within hours and is affected by the chemistry of the surface layer. The relationship between cement alkali content and zinc corrosion rate is important to understanding the initial passivation of galvanized coatings in concrete. The pH of cement in contact with the galvanized coating controls the formation of a compact and adherent layer of calcium hydroxyzincate (CHZ), a compound that passivates the surface of the zinc coating from further reaction with the concrete.

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