Fig. 1. Polarization curves of the mild steel in 1N HCl solution without and with different concentration (1÷4 g/L) of OPEO and 3.5 g/L URO
Fig. 2. The inhibition efficiency of OPEO and URO for the mild steel in the 1N HCl acid after different immersion times
Fig. 3. SEM images of the mild steel surface before and after 1h of exposure in 1N HCl acid at 25 °C: (A) before; (B) after corrosion in the blank solution; (C) after corrosion in the presence of 3 g/L OPEO; and (D) after corrosion in the presence of 3.5 g/L URO
Fig. 5. Dependence of surface coverage of the mild steel on the concentration of OPEO added in the test solutions.
Fig. 6. Isotherm adsorption of inhibitor on the surface of the mild steel in 1N HCl at different temperatures: (A) Langmuir isotherm; (B) Temkin isotherm and (C) Frumkin isotherm
Fig. 7. SEM images of the mild steel surface before and after 1h of exposure in acid 1N HCl with and without 3 g/L OPEO at 25°C: (A) pristine; (B) after corrosion in the blank solution; (C) and (D) after corrosion in the blank solution followed by rinsing; (E) after corrosion in the presence of OPEO; and (F) after corrosion in the presence of OPEO followed by rinsing
Fig. 8. FTIR spectrum in the region of 400-4000 cm-1 of the film formed on the mild steel surface after 24 hour immersed in 1N HCl solution with 3 g/L OPEO at 25°C
Fig. 9. The adsorption model of OPEO on the mild steel surface
Fig. 4. (A) Nyquist plots of the mild steel in 1N HCl solutions in the absence and presence of OPEO with various concentrations (1÷4 g/L); (B) Relevant equivalent circuit model used for fitting measured impedance data. Rs is solution resistance; Rct is charge transfer resistance; CPE is the constant phase element; RL and L are inductive parameters
Table 1. The composition of OPEO analyzed by GCMS method
Table 2. Potentiodynamic polarization parameters for the mild steel in 1N HCl solution with and without inhibitors.
Table 3. EIS parameters for the mild steel in 1N HCl solution in the absence and presence of OPEO fitted by the equivalent circuit
Table 4. The adsorption-desorption equilibrium constant K (M-1) and adsorption free energy ΔGads calculated Langmuir and Temkin models
Table 5. The compositions of the mild steel surface before and after corrosion in the test solutions in the absence andpresence of 3 g/L OPEO inhibitor.
Table 6. Data analysis of FTIR spectrum of the absorption film formed on the steel surface
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