In retrospect, it is clear that the advent of inorganic zinc silicate coatings some 35 years ago represented a most important advance in the technology of protecting iron and steel structures against corrosion. Prior to the inorganic zinc era, protection of steel structures had relied on paint formulations based on oils and oleo-resinous vehicles. Used often with inhibitive primers, these systems depended on the principles of corrosion inhibition and environmental isolation to give protection. With the arrival of inorganic zincs, the concept of steel protection underwent a fundamental change.

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