Protection of Corrosion of Carbon Steel by Inhibitors in Chloride Containing Solutions

In the first part of this study, the inhibitor effect of single, binary and   ternary mixture of chromate, molybdate, nitrite, tetraborate, ortophosphate, benzoate, acetate, ascorbic acid on   the corrosion of carbon steel was investigated. Experiments were carried out in   neutral aqueous solution containing 100 ppm Cl- at room temperature. The current-potential curves were obtained by potentiostatic insert ignore into journalissuearticles values(1mV/s); method and the corrosion rates were determined by the extrapolation of the Tafel slope of the cathodic polarization curves method and linear polarization method. In the second part, the inhibitor effect of some one component, binary and ternary inhibitor blends was investigated depending on the temperature insert ignore into journalissuearticles values(30, 40, 50 o C); and pH insert ignore into journalissuearticles values(5, 7, 9);. The inhibitor effects were found to be %95 for solutions containing 50 ppm nitrite. Of all inhibitor systems tried, chromate-molibdate and chromate- nitrite- molibdate was found to be the most effective binary and ternary inhibitor blends, the effectiveness of which is   equal to that of sodium chromate, sodium nitrite, sodium molibdate that alone and used at a high level.   Key Words: Corrosion, Inhibitor, Carbon Steel