51315-5775-Performance Evaluation of Corrosion Inhibitors in Chloride and Sulfate Environment

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Product Number: 51315-5775-SG

ISBN: 5775 2015 CP

Author: Mohammed Maslehuddin

Publication Date: 2015

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Performance Evaluation of Corrosion Inhibitors in Chloride and Sulfate EnvironmentProf. Omar S. Baghabra Al-Amoudi*Prof. Mohammed Maslehuddin**[1]Eng. Khaled A. Alawi Al-Sodani**** Dr. Zia Chowdhary**Department of Civil and Environmental Engineering**Center for Engineering Research Research InstituteKing Fahd University of Petroleum and MineralsDhahran 31261 Saudi Arabia*** SABIC Technology; Al-Jubail Saudi ArabiaAbstractDeterioration of concrete structures due to reinforcement corrosion is noted in many industrial and non-industrial structures particularly in the coastal regions or in contaminated soils. The presence of chloride and sulfate salts lead to the deterioration of concrete and corrosion of reinforcing steel. Previous studies conducted by the authors indicated that chloride-induced reinforcement corrosion is accelerated due to the concomitant presence of chloride and sulfate ions. Several protective measures are adopted to minimize reinforcement corrosion in such environments. One such measure is the use of chemical inhibitors. However data are lacking on the usefulness of chemical inhibitors in chloride-sulfate environments.In this study the performance of corrosion inhibitors in chloride plus sulfate environments was investigated. The effect of three various levels of contamination (1000 ppm Cl plus 0 500 or 2000 ppm SO4) on reinforcement corrosion in concrete with inhibitors was investigated. In addition scanning electron microscopy was used to assess morphology of steel exposed to chloride plus sulfate environments.The data developed in the reported study indicated that an increase in the sulfate concentration from 0 to 2000 ppm increased the chloride-induced reinforcement corrosion by almost three times. Further the investigated inhibitors were effective in mitigating reinforcement corrosion in the chloride plus sulfate environments. Recommendations on the type of inhibitor suitable for the chloride plus sulfate environments are provided.[1]Corresponding author E-mail: muddin@kfupm.edu.sa