The performance of ethylenediamine tetramethylene phosphonic sodium (EDTMPS) in combination with zinc gluconate (ZnGL) for corrosion inhibition on X65MS pipeline steel in H 2 S corrosion simulation environments was thoroughly examined using both experimental and theoretical methods. Various techniques, including weight loss measurements, electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP), and surface characterization methods like scanning electron microscopy (SEM), X-ray diffraction (XRD), and energy-dispersive spectroscopy (EDS), demonstrated that the combination of ZnGL and EDTMPS displayed a notable synergistic effect on inhibition. The analysis of polarization curves showed a considerable decrease in corrosion current density ( i corr ) from 3.948 μA/cm 2 to 0.307 μA/cm 2 , resulting in an impressive inhibition efficiency of 92.22%. Additionally, the corrosion potential ( E corr ) shifted from -750.25 mV to -769.60 mV, indicative of a mixed-type inhibition mechanism. Further electrochemical findings revealed a significant increase in charge transfer resistance ( R ct ) from 260 Ω cm 2 to 3445 Ω cm 2 , along with a reduction in double-layer capacitance, implying the development of a robust protective film. Surface analysis supported the identification of Zn(OH) 2 and Fe-Zn-EDTMPS complexes, while quantum chemical computations and molecular dynamics (MD) simulations clarified the adsorption mechanism, emphasizing the significance of nitrogen and phosphonic acid groups in establishing stable coordination bonds. This research positions ZnGL-EDTMPS as a viable environmentally friendly inhibitor for pipeline steel in H 2 S conditions, providing valuable insights into its dual physical-chemical adsorption mechanism and practical utility.
Yang et al. (Mon,) studied this question.
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