1. 1. 2. 3. 4. 5. © The Isoxazolidines: The Effects Of Steric Factor And Hydrophobic Chain Length On The Corrosion Inhibition Of Mild Steel In Acidic Medium Ali, SA; El-Shareef, AM; Al-Ghamdi, RF; Saeed, MT PERGAMON-ELSEVIER SCIENCE LTD, CORROSION SCIENCE; pp: 2659-2678; Vol: 47 King Fahd University of Petroleum & Minerals http://www.kfupm.edu.sa Summary Several new isoxazolidines having varying degree of steric environment and hydrophobic chain length, prepared efficiently using single-step nitrone cycloaddition reactions, are tested for corrosion inhibition of mild steel in 1 M and 5 M HCl at 50- 70 degrees C range by gravimetric and electrochemical methods. All compounds have shown very good corrosion inhibition efficiency (IE%) in acidic solution. Steric crowding around the nitrogen centres and hydrophobic chain lengths as well as increase in temperature (in the presence of the inhibitor in the higher concentration range 100-400 ppm) are found to increase the inhibition efficiency of the isoxazolidines. Thermodynamic parameters (Delta G degrees(ads), Delta H degrees(ads), Delta S degrees(ads)) for the adsorption process and kinetic parameters for the metal dissolution (or hydrogen evolution) reaction in the presence of one of the isoxazolidines were determined. Experimental results agree with the Temkin adsorption isotherm. The inhibition of corrosion in 1 M HCl, influenced by both physi- and chemi-sorption, was found to be under mixed control, but predominantly under cathodic control. (c) 2004 Elsevier Ltd. All rights reserved. References: AJMAL M, 1999, BRIT CORROS J, V34, P220 ALI SA, 1988, J CHEM SOC P1, P597 ALI SA, 2003, CORROS SCI, V45, P253 ARAMAKI K, 1987, CORROS SCI, V27, P487 BECKMANN E, 1909, LIEBIGS ANN CHEM, V365, P204 Copyright: King Fahd University of Petroleum & Minerals; http://www.kfupm.edu.sa

2. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. © BENTISS F, 2000, CORROS SCI, V42, P127 BISSOT TC, 1957, J AM CHEM SOC, V79, P796 BRANSOI V, 2001, INT C CHEM CHEM ENG CIZEK A, 1994, MATER PERFORMANCE, V33, P56 CONFALONE PN, 1988, ORG REACTIONS, V36, P1 DUAN SZ, 1990, INTERFACE CHEM, P124 DURNIE W, 1999, J ELECTROCHEM SOC, V146, P1751 EBENSO EE, 1998, NIG CORROS J, V1, P29 ELACHOURI M, 1995, CORROS SCI, V37, P381 ELACHOURI M, 2001, PROG ORG COAT, V43, P267 FRENIER WW, 1993, REV CORROSION SCI TE, P11 GROWCOCK FB, 1980, P 6 EUR S CORR IN S7, V7, P1185 HACKERMAN N, 1962, P 1 INT C MET CORR, P166 IDA H, 1983, KAGAKU KYOKAISHI, V41, P652 JAYAPERUMAL D, 1997, ANTI-CORROS METHOD M, V44, P265 KAZARAZI S, 2000, B ELECTROCHEM, V16, P97 KERTIT S, 1996, APPL SURF SCI, V93, P59 KJELLIN C, 1997, BER, V30, P1891 MERNARI B, 1998, CORROS SCI, V40, P391 MERNARI B, 2001, B ELECTROCHEM, V17, P115 MOSENHEIMER J, 1939, LIEBIGS ANN CHEM, V539, P84 MURALIDHARAN S, 1995, J ELECTROCHEM SOC, V142, P1478 RIGGS OL, 1967, CORROSION, V23, P252 SASTRI VS, 1998, CORROSION INHIBITORS SHREIR LL, 1994, CORROSION, V2, P23 STOYANOVA AE, 1997, CORROS SCI, V39, P1595 SULAIMAN QIM, 1990, P 7 SEIC ANN U FER S, V9, P189 TUFARIELLO JJ, 1984, 1 3 DIPOLAR CYCLOADD, V2, P83 UHLIG HH, 1985, CORROSION CORROSION WAZEER MIM, 1995, CAN J APPL SPECTROSC, V40, P53 ZUCCHI F, 1994, CORROS SCI, V36, P1683 For pre-prints please write to: shaikh@kfupm.edu.sa Copyright: King Fahd University of Petroleum & Minerals; http://www.kfupm.edu.sa