Around the world, researchers have found out a lot of chemical compounds inhibit corrosion, but in fact for the concrete, only a handful of which are used effectively and can use. Based on the characteristics and effects of each type of inhibitors, corrosion inhibitors are classified in several different ways based on the nature, composition, the ability to apply ... Based on the nature of the corrosive environment, it is divided into 3 types: + Corrosion inhibitor in water and salt solution. + Corrosion inhibitor in the air. + Corrosion inhibitors in alkaline. Based on the nature of use, it is divided into two categories: corrosion inhibitor + Mixing corrosion inhibitor directly into the concrete, mortar mixture. + Osmotic corrosion inhibitor used to scan external coating when the concrete has cured. Component-based inhibitor of one subdivided into two types: + Inorganic corrosion inhibitor. + Organic corrosion inhibitors. If as part of organic corrosion inhibitor containing the atoms are polar as S and N, then it may be cleaning up side on metal surfaces. In fact the most common classification is now according to the mechanism of action of each type of inhibitor for corrosion processes: + Anốt corrosion inhibitor (also known as passive corrosion inhibitor). + Cathode corrosion inhibitor.
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