Protection of metallic structures from corrosion has always been a challenging task for designers and coating technologists. Inadequately protected structures are prone to severe damages, leading to expensive repairs and high maintenance costs. Application of paint systems has remained most economical method for corrosion protection since ages. Environmental and health concerns have increased restrictions on use of solvent-based coatings as these release the volatile organic compounds (VOC) during drying / curing into the atmosphere, contributing significantly to the air pollution.. This has led to changes in paint compositions, surface preparation procedures, and application techniques. Traditional solvent-borne coatings, such as alkyds and epoxies, have been reformulated to meet the VOC regulations by using binders with lower viscosities. Continued research and development activities have produced zero or low VOC paint compositions, such as water-based paints, high- solids paints, solvent-free paints, radiation cured coatings, powder coatings and thermally sprayable coatings.
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