The corrosion of the steel in concrete is an electrochemical process. Being different from the mechanism of sulfate attack on concrete [11, 12, 18, 19], the sulfuric acid corrosion mechanism for concrete is the result of a combined action of dissolved corrosion caused by hydrogen ion (H +) and expanded corrosion caused by SO 4 2− (sulfate ion) .

This process is called a Types and Causes of Concrete Deterioration Basically, corrosion of reinforcement is due to the breakdown of its passive layer which is composed of an insoluble thin oxide film. Concrete degradation may have various causes.Concrete can be damaged by fire, aggregate expansion, sea water effects, bacterial corrosion, calcium leaching, physical damage and chemical damage (from carbonatation, chlorides, sulfates and non-distilled water).This process adversely affects concrete exposed to these damaging stimuli.

In the field, however, concrete often has cracks that extend to the reinforcing steel. In new concrete, alkaline (high pH) conditions form a passive film on the surface of the steel rebar rods, thus preventing or minimizing corrosion initially.But eventually, a pH reduction caused by carbonation or by ingress of chlorides (salt) causes the passive film to degrade, allowing the reinforcement to corrode in the presence of oxygen and moisture. Corrosion is an electrochemical process involving the flow of charges (electrons and ions). Corrosion Mechanisms of Reinforcing Steel. CORROSION IN CONCRETE: INHIBITORS AND COATING | The use of corrosion ihnibitors and coatings is investigated to evakuatre the effect on bith initiation and propagation of corrosion. Hotel operators do not want scaffolds, cables and exposed metalwork on display for extended periods of time. Under these conditions the steel Quality Concrete—Concrete Practices The first defense against corrosion of steel in concrete is quality concrete and sufficient concrete cover over the reinforcing bars. Chloride contamination of concrete is by far the most significant cause of reinforced concrete corrosion globally. Corrosion of reinforced concrete structures is nowadays one of the major concerns involving the durability and serviceability of buildings and constructions. Corrosion is an electrochemical process involving the flow of charges (electrons and ions). Corrosion of steel in concrete is studied typically in uncracked concrete. Corrosion of the steel reinforcement bars may occur due to localized failure of the passive film on the steel by chloride ions or a general failure of the passivity by neutralisation of the concrete due to reaction with carbon dioxide from the atmosphere.

RECENT developments in concrete offshore structures have drawn attention to a disturbing ignorance of the mechanism by which steel corrosion is prevented when it is embedded in dense concrete1. What is corrosion of reinforcement in concrete? Electrochemical corrosion testing was performed on cracked concrete of two qualities. 3 shows a corroding steel bar embedded in concrete. At active sites on the bar, called anodes, iron atoms lose electrons and move into the surround-ing concrete as ferrous ions.