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<p>The isostructural hybrid phosphites (C<sub>2</sub>H<sub>10</sub>N<sub>2</sub>)[Mn(H<sub>2</sub>PO<sub>3</sub>)<sub>2</sub>Cl<sub>2</sub>] and (C<sub>2</sub>H<sub>10</sub>N<sub>2</sub>)[Ni(H<sub>2</sub>PO<sub>3</sub>)<sub>2</sub>Cl<sub>2</sub>] were synthesized as corrosion inhibitors using wet chemical methods and characterized through single-crystal X-ray diffraction, infrared spectroscopy, and thermal stability analysis via TGA-DTA. Their corrosion inhibition performance for C38 in 1 M HCl solution was assessed using electrochemical impedance spectroscopy (EIS) and the potentiodynamic polarization technique. Both isostructural hybrids revealed significant anti-corrosion activity with inhibition efficiencies of 84 and 73% at 10<sup>–3</sup> M for (C<sub>2</sub>H<sub>10</sub>N<sub>2</sub>)[Mn(H<sub>2</sub>PO<sub>3</sub>)<sub>2</sub>Cl<sub>2</sub>] and (C<sub>2</sub>H<sub>10</sub>N<sub>2</sub>)[Ni(H<sub>2</sub>PO<sub>3</sub>)<sub>2</sub>Cl<sub>2</sub>], respectively. The results showed that as the inhibitor concentration increased, the corrosion rate of C38 steel decreased, leading to higher inhibition efficiencies. Polarization curves further confirmed that hybrid phosphites act as mixed-type inhibitors. Besides that, the DTF studies demonstrated that (C<sub>2</sub>H<sub>10</sub>N<sub>2</sub>)[Mn(H<sub>2</sub>PO<sub>3</sub>)<sub>2</sub>Cl<sub>2</sub>] exhibits higher reactivity, as supported by the electron transfer fraction and anti-corrosion performance results.</p>

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Organic–inorganic hybrid phosphites (C2H10N2)[M(H2PO3)2Cl2] (M = Ni, Mn) for corrosion protection: Experimental and computational approaches

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • Mohammed Zerrouk,
  • Mohammed Er-Rajy,
  • Elhachmia Ech-Chihbi,
  • Asmae Ben Abdelhadi,
  • Rinad Hamed,
  • Belkheir Hammouti,
  • Shehdeh Jodeh,
  • Khalil Azzaoui,
  • Rachid Ouarsal,
  • Mohammed Lachkar

摘要

The isostructural hybrid phosphites (C2H10N2)[Mn(H2PO3)2Cl2] and (C2H10N2)[Ni(H2PO3)2Cl2] were synthesized as corrosion inhibitors using wet chemical methods and characterized through single-crystal X-ray diffraction, infrared spectroscopy, and thermal stability analysis via TGA-DTA. Their corrosion inhibition performance for C38 in 1 M HCl solution was assessed using electrochemical impedance spectroscopy (EIS) and the potentiodynamic polarization technique. Both isostructural hybrids revealed significant anti-corrosion activity with inhibition efficiencies of 84 and 73% at 10–3 M for (C2H10N2)[Mn(H2PO3)2Cl2] and (C2H10N2)[Ni(H2PO3)2Cl2], respectively. The results showed that as the inhibitor concentration increased, the corrosion rate of C38 steel decreased, leading to higher inhibition efficiencies. Polarization curves further confirmed that hybrid phosphites act as mixed-type inhibitors. Besides that, the DTF studies demonstrated that (C2H10N2)[Mn(H2PO3)2Cl2] exhibits higher reactivity, as supported by the electron transfer fraction and anti-corrosion performance results.