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Novel classes of organic corrosion inhibitors

Explore the applications, factors, and new classes of organic corrosion inhibitors for diverse industrial uses like water treatment, automotive coolants, and oil production. Discover their inhibition performance and future research directions.

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Novel classes of organic corrosion inhibitors

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  1. Novel classes of organic corrosion inhibitors Dr. S. U. Rahman Associate Professor, Chemical Engineering Department King Fahd University of Petroleum & Minerals, Dhahran-31261, Saudi Arabia

  2. Applications of Corrosion Inhibitors • Water • Potable Water • Silicates, Popyphosphates, CaCO3 • Cooling Water • Chromate, Nitrate, Polyphosphates, • Automotive Coolants • Nitrite, Benzoate, Borax, • Steam Condensates • Mophines, cyclohexamine, Long chain aliphatic amines • Brine and Seawater • Nitrite, Chromates, Phosphates • Acid Pickling • Sulfur and nitrogen containing organic compounds • Oil Production and Refining • Sulfur and nitrogen containing organic compounds

  3. Factors Affecting Inhibition of Cooling Systems • Oxygen saturation • Water soluble gases • pH • TDS • Silt and Solids • Sulfate bearing Bacteria

  4. Requirements of Inhibitors • Surface coverage • Low concentration • Wide range of conditions (T, pH and water quality) • Should not produce solid deposits • Low/nil toxicity • Antiscaling properties

  5. New Classes of Inhibitors • Isoxazolidines1 • Cyclic Hydroxylamines2 • Cyclic Nitrones3 1 Ali, A. A., Saeed, M. T., Rahman, S. U., Corrosion Science, 45 (2003) 253-266. 2 Saeed, M. T., Ali, A. A., Rahman, S. U., Anti-Corrosion Methods and Materials, 50 (2003) 201-207. 3 Rahman, S. U., Saeed, M. T., Ali, S. A, Anti-Corrosion Methods and Materials (Accepted).

  6. Isoxazolidines1 Nitrone isoxazoidines Diadducts Cycloadducts 1 Ali, A. A., Saeed, M. T., Rahman, S. U., Corrosion Science, 45 (2003) 253-266.

  7. Quaternary Ammonium Salts1 Quaternary Amm. Salt Isoxazolidine Quaternary Amm. Salt 1 Ali, A. A., Saeed, M. T., Rahman, S. U., Corrosion Science, 45 (2003) 253-266.

  8. Summary of all isoxazolidines isoxazoidines Cycloadducts Quaternary Ammonium Salts Diadducts 1 Ali, A. A., Saeed, M. T., Rahman, S. U., Corrosion Science, 45 (2003) 253-266.

  9. Gravimetric Tests (Inhibition Efficiencies) Substrate metal : Mild steel, Temperature : 60 C, Exposure : 6 hrs, Base solution : 1 N HCl asoluble in 10% acetone in 1N HCl b%IE for 10 and 25 ppm were 87.2 and 91.8, respectively.

  10. Tafel Tests Substrate metal : Mild steel, Temperature : 60 C, Exposure : 20 minutes, Base solution : 1 N HCl, Inhibitor Concentration : 400 ppm 1 Ali, A. A., Saeed, M. T., Rahman, S. U., Corrosion Science, 45 (2003) 253-266.

  11. Cyclic Hydroxylamines2 Hydroxylamines Nitrone Hydroxypyrrolidine Cyclic Nitrones Hydroxylamines Hydroxylamines 1 Saeed, M. T., Ali, A. A., Rahman, S. U., Anti-Corrosion Methods and Materials, 50 (2003) 201-207.

  12. Hydroxylamines 1 Saeed, M. T., Ali, A. A., Rahman, S. U., Anti-Corrosion Methods and Materials, 50 (2003) 201-207.

  13. Gravimetric Tests (Inhibition Efficiencies) Substrate metal : Mild steel, Temperature : 60 C, Exposure : 6 hrs, Base solution : 1 N HCl asoluble in 10% acetone in 1 N HCl; d %IE for inhibitor concentration of 10 and 25 ppm was determined to be 26.7 and 62.5, respectively.

  14. Tafel Tests Substrate metal : Mild steel, Temperature : 60 C, Exposure : 20 minutes, Base solution : 1 N HCl, Inhibitor Concentration : 400 ppm 1 Saeed, M. T., Ali, A. A., Rahman, S. U., Anti-Corrosion Methods and Materials, 50 (2003) 201-207.

  15. Cyclic Nitrones3 1 Rahman, S. U., Saeed, M. T., Ali, S. A, Anti-Corrosion Methods and Materials (Accepted).

  16. Gravimetric Tests (Inhibition Efficiencies) Substrate metal : Mild steel, Temperature : 60 C, Exposure : 6 hrs, Base solution : 1 N HCl asoluble in 10% acetone in 1N HCl

  17. Tafel Tests1 1 Rahman, S. U., Saeed, M. T., Ali, S. A, Anti-Corrosion Methods and Materials (Accepted).

  18. Conclusions • Following new compound exhibited excellent corrosion inhibition of mild steel in hot acidic medium: Polar compounds with substantially bulky non-polar chains were better inhibitors. Isoxazolidines Cyclic Hydroxylamines Cyclic Nitrones

  19. Future work • Gather more data in different corrosive environments. • Use mixtures of these compounds. Statistical experimental design will be beneficial • Perform toxicity studies • Study their anti-scalent properties. • Study their synergy with commercial anti-scalents.

  20. Acknowledgement • Prof. S. A. Ali, • Dr. M. T. Saeed,

  21. Thank you…

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