Insight into the corrosion inhibition and adsorption behavior of synthetic pyrazole surfactants as an efficient inhibitor for carbon steel in 1.0 mol/L HCl solutions

• M. Alfakeer¹, Tasnem Al-Habal², Refat El-Sayed^3,4, Reda Abdel-Hameed^5,6 and M. Abdallah^2,3

¹ Chemistry Department, Faculty of Science, Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia
² Chemistry Department, Faculty of Applied Science, Umm Al-Qura University, Makkah, Saudi Arabia
³ Chemistry Department, Faculty of Science, Benha University, Benha, Egypt
⁴ Chemistry Department University College in Al-Jamoum, Umm Al-Qura University, Makkah, Saudi Arabia
⁵ Chemistry Department, Faculty of Science, Al-Azhar Univ., 11884 Egypt
⁶ Basic Science Department, Preparatory Year, University of Hail, Hail, 1560, Saudi Arabia

Abstract: Two nonionic surfactants (NI Surf.) compounds derived from pyrazole were synthesized and inspected as inhibitors for corrosion of C-steel (CSt) in 1 mol/L HCl solution utilizing weight reduction (WR), potentiodynamic polarization (PDP) and electrochemical impedance spectroscopic (EIS) methods. The chemical compositions of the synthetic NI Surf. were proven by IR, ¹H and ¹³C NMR. The corrosion and surface properties confirm the inhibitory effect of the NI Surf. compounds. The percentage of inhibitory efficacy (%) increases with increasing NI Surf concentration, and with decreasing temperature. PDP method has proven that the NI Surf. I and II act as mixed inhibitors. The maximum %η was found to be 90.41% for the compound I and 91.45% for compound II at a concentration of 500 ppm at 292 K temperature using PDP measurements. The higher %η of compound II is related to its chemical structure and the presence of more adsorption centers. The inhibition was demonstrated by its spontaneous adsorption on the CSt surface owing to the Freundlich isotherms. There is a clear agreement between the % values that were assigned from the different techniques.

Keywords: C-steel, nonionic surfactant, corrosion, inhibitors, adsorption, surface activity

Int. J. Corros. Scale Inhib., 2023, 12, no. 4, 2024-2045
doi: 10.17675/2305-6894-2023-12-4-31

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