Piles are structures used to transfer loads from superstructure to the sub surface strata. When the subsurface stratum is water based or if we deal with a hydraulic structure, the piles are to be driven into water and under water strata. Piles used in underwater structures are often subjected to corrosion. There is no absolute way to eliminate all corrosion; but corrosion protection measures are employed to control the effect of corrosion. Corrosion protection can be in different ways according to the environment and other factors. Forms of corrosion protection include the use of inhibitors, surface treatments, coatings and sealants, cathodic protection and anodic protection. The control measures explained in this are Protective coatings, cathodic treatment and application of Fibre Re-inforced Polymer (FRP) Composites.

Corrosionis the destruction of metals and alloys by the chemical reaction with theenvironment. During corrosion the metals are converted to metallic compounds atthe surface and these compounds wears away as corrosion product. Hencecorrosion may be regarded as the reverse process of extraction of metals fromore.

Corrosionand in particular corrosion of metal structures, is a problem that mustregularly be addressed in a wide  variety of areas, for example, inthe automotive industry, metal parts are often plated or coated to protect themfrom road salt and moisture in hopes of increasing their longevity. Indeed,many traditional metal parts are currently being used with polymericcomponents, which are not only lighter but also more cost effective to produce.But these are generally impervious to electrochemical corrosion oftenexperienced by metals. Even with the proper selection of base metals and well-designedsystems or structures, there is no absolute way to eliminate all corrosion.Therefore, corrosion protection methods are used to additionally mitigate andcontrol the effects of corrosion. Corrosion protection can be in a number ofdifferent forms/strategies with perhaps multiple methods applied in severeenvironments. Forms of corrosion protection include the use of inhibitors,surface treatments, coatings and sealants, cathodic protection and anodicprotection.