Novel calixarene derivatives as inhibitors of mild C-38 steel corrosion in 1 M HCl
Calixarenes CA1–CA4 containing one to four 4-imidazolylethylamidocarbonyl groups were synthesized and tested as inhibitors for the corrosion of mild steel in 1 M HCl at 308 K. The study was made using Tafel polarisation and weight-loss methods. In contrast to CA1, calixarenes CA2–CA4 were good inhibitors, reaching inhibition efficiencies (E%) of 94 to 100% at 10−4 M. The values of the inhibition efficiency calculated by the two techniques were in acceptable agreement. E% increased with the number of 4-imidazolylethylamidocarbonyl groups attached to the calixarene. Polarisation curves showed that CA2–CA4 act as mixed-type inhibitors. Their adsorption on the steel surface followed a Langmuir isotherm. Thermodynamic parameters of adsorption were also deduced.
KeywordsCorrosion Steel Calixarene Inhibition Hydrochloric acid Chemisorption
- 16.Gutsche J Am Chem Soc 1996 118:12840Google Scholar
- 17.Evans (2005) Sensors Actuators B105: 204; Lucke A, Stirling CJM, Böhmer V (2001) Calixarenes (2001) In: Asfari Z, Böhmer V, Harrowfield, J, Vicens J (eds) Kluwer Academic Publishers, p 612Google Scholar
- 20.Bockris JO’M, Reddy AKN, Gamboa-Aldeco M (2002) Modern electrochemistry, fundamentals of electrodics, 2nd. Kluwer Academic Publishers, p 1025Google Scholar
- 21.Landolt D (1993) Corrosion et Chimie de Surface des Métaux, 1st edn. Alden Press, Oxford, p 495Google Scholar
- 26.Gomma GK, Wahdan MH (1995) Ind J Chem Technol 2:107Google Scholar