Concrete structures in coastal areas can be distinguished vis-à-vis corrosion: The submerged zone (under seawater), the splash and tide zone (intermittently wet and dry) and the atmospheric zone (well above the high tide level). Each of the above zones has very different corrosion characteristics. Corrosion below the water level is limited by low oxygen availability and conversely lowers chloride and moisture content limit the corrosion rate above high tide level. Corrosion is most severe within the splash and tidal zones where alternate wetting and drying result in high chloride and oxygen content. Atmospherically exposed structures (buildings) are subjected to corrosion from airborne salts and moisture from atmosphere. The quality of the concrete and the depth of cover play a major role in the ingress of chloride Hence it becomes very important to protect new and old structure with proper coatings inhancing durability of such structures