Corrosion Inhibitors Behaviour on Reinforced Concrete—A Review

Corrosion is one of the major deterioration problems in the reinforced concrete industry. Approximately, more than 18 billion dollars per year is incurred on the repair and rehabilitation of corroded structures throughout the world. The occurrence of corrosion is because of chloride particles present in the atmosphere and carbonation process in concrete. Reinforcement corrosion is an electrochemical process that defines the concentrations between variations of dissolved ions in the concrete. This paper focuses on the corrosion inhibitors which are used as migration corrosion inhibitors (applied on the surface) of the concrete specimen and admixed into the concretes. An in-depth study on the mechanism of corrosion and the effect of migrated, cathodic and anodic on reinforced concrete has been performed. A critical review of the causes of the corrosion as well as preventions by using organic, inorganic and natural inhibitors is carried out.