It is always a challenge to designer and coating formulator to select most suitable, correct and efficient methods for metal protection. Selection of correct method for metal protection involves various factors viz. environmental conditions, structure dimensions, working parameters, financial considerations etc. Use of non-corrosive metals such as stainless steel, aluminium or other noble metals sometime finds limitations due to process parameters and other working conditions of the equipment. Similarly it is not practically possible to provide a corrosion free environment to entire infrastructure during entire service span. Galvanic protection also suffers from some limitations as it requires different galvanic series for different environments.