The Effect of Temperature on the Corrosion of Mild Steel in H3PO4 Containing Halides and Sulfate Ions

  • Chandrasekaran, V. (Department of Chemistry, Government College of engineering) ;
  • Kannan, K. (Department of Chemistry, Government College of engineering) ;
  • Natesan, M. (Department of Chemistry, Government College of engineering)
  • 발행 : 2005.02.01

초록

The corrosion behaviour of mild steel in phosphoric acid solution in the presence and absence of pollutants viz. Chloride, Fluoride and Sulfate ions at 302K-333K was studied using mass loss and potentiostatic polarization methods. The addition of chloride and sulfate ions inhibits the mild steel corrosion in phosphoric acid while fluoride ions stimulate it. The effect of temperature on the corrosion behaviour of mild steel indicated that inhibition of chloride and sulfate ions decreased with increasing temperature. The adsorption of these ions (Chloride and sulfate) on the mild steel surface in acid has been found to obey Langmuir adsorption isotherm. The values of activation energy (Ea) and free energy of adsorption ($\Delta$) indicated physical adsorption of these ions (chloride and sulfate) on the mild steel surface. The plot of $logW_{f}$ against time (days) at 302K gives a straight line, which suggested that it obeys first order kinetics and also calculate the rate constant k and half-life time $t_{1/2}$.

키워드

참고문헌

  1. A. C. Hart, Br. Corros. J., 6, 205 (1971)
  2. A. C. Hart, Br. Corros. J., 8, 66 (1973)
  3. R. M. Saleh, M. M. Badran, A. A. Alhosary, and H. A. El Dahan, Br. Corros. J., 3, 105 (1988)
  4. P. Barrco, G. Chairo and A. C. Farina, Proc of the 11th International Corrosion Congress Florence, and Italy, 2(2), 539 (1990)
  5. F Smith and N H Van Droffelaar, Br. Corrs. J., 26, 265 (1991)
  6. Mars.G.Fontana, Corrosion Engineering 3rd Edn, p.357
  7. A Alon, J Yahalon and M Schorr, Corrosion, 31, 315 (1978)
  8. T. Sydberger and S. Nordin, Corrosion, 34, 16 (1978)
  9. J. P. Audourand, D. Catelin and P. Soulignac, Corros. Prevo Process Ind., Proc, NACE 1st Int. Symp., 1988 (1990) p.71
  10. A Guenbour, J Faucheu, and A Ben-Bachir, Corrosion, 44, 214 (1988)
  11. M S Abdel-Aal and A A Hermas, Appl. Electrochem., 30, 339 (2000)
  12. L. Dc Michelli, A. H. P. Andrea, C. A. Barbosa, and S. M. L. Agostinho, Br. Corros. J., 34, 67 (1999)
  13. H. Williams and R. A. Hamson, Surf Tech., 4, 465 (1976)
  14. K. E. Heusler, J. Electrochem. Soc., 62, 529 (1958)
  15. J. O. M. Bockris, B. Drazic, and A R Despic, Electrochem Acta, 4, 325 (1961)
  16. A. J. Ariva and J. J. Podesta, Corros. Sci., 8, 203 (1968)
  17. R. M. Hudson G. J. Warning, Mat. Prot., 6, 52 (1967)
  18. R. M. Hudson G. J. Waming Corros. Sci., 10, 12 (1970)
  19. K. F. Hager and M. Rosenthal, Corrosion, 6, 344 (1950)
  20. N. Hackermann, E. S. Snevel, and J. S. Pag-ne, J. Electrochem. Soc., 113, 677 (1966)
  21. N. C. Subramaniam, B. S. Sheshadri, and S. M. Mayanna, J. Electrochem. Soc. India, 42, 95 (1993)
  22. M. Natesan, G. Venkatachari, and S. Venkatakrishna Iyer, Bull. Electrochem., 9, 403 (1993)
  23. P. B. Mathur and T. Vasudevan, Corrosion, 38, 17 (1982)
  24. ASTM G 13-72, 'Standard practice for Laboratory Immersion Corrosion Testing of Metals' (West Conshohocken, PA: ASTM,1990)
  25. M. Ajmal, A. S. Mideen, and M. A. Quraishi, Corros Sci., 36, 79 (1994) https://doi.org/10.1016/0010-938X(94)90110-4
  26. Mohamed Samir S Morad, Abo El-Hagag, A. Hermas and Mohamed, S. Abdel Aal, J Chem. Technol. Biotechnol., 77, 186 (2002)
  27. E. E. Ebenso, Bull. Electrochem.,19(5), 209 (2003)
  28. R. Saratha, C. Markkannu, and S. Sivakumar-Sundari, Bull. Electrochem., 18(3), 141 (2002)
  29. H. M. Bhajiwala and R. T. Vashi, Bull. Electrochem., 18(6), 261 (2002)
  30. M. A. Quraishi and H. K. Sharma, Bull. Electrochem., 19(12), 535 (2003)
  31. P. C. Okafor, E. E. Ebenso, U. J. Ibok, U. J. Ekpe, and M. J. Ikpi, Trans. SAEST, 38, 91 (2003)
  32. M. A. Quaraishi and D. Jamal, Bull. Electrochem., 18(7), 289 (2002)
  33. M. S. Abdel-Aal and A. A. Hormas, Appl. Electrochem., 30, 339 (2000)
  34. E. E. Ebenson, P. C. Okafor, O. E. Offiong BI Ifa, U. T. Ibok, and U. T. Ekpe, Bull. Electrochem., 17(10), 459 (2001)
  35. G. K. Gomma, Mater Chem Phys, 55, 241 (1998)
  36. K. Snyder, I. N. Holt, R., Winston (Eds), Chem Struct React, 56, (1978)
  37. J. E. Huheey, Inorganic Chemistry. 3rd Edn., p.46 (1998)