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Propoxylated Fatty Esters as Safe Inhibitors for Corrosion of Zinc in Hydrochloric Acid

  • PHYSICOCHEMICAL PROBLEMS OF MATERIALS PROTECTION
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Abstract

The inhibiting action of nonionic surfactants, namely, propoxylated fatty esters (PFE) with different number of propylene oxide toward the corrosion of Zn in 0.1 M HCl solutions was investigated. Four techniques were used in this study such as weight loss, galvanostatic polarization, potentiodynamic anodic polarization and electrochemical impedance spectroscopy. The inhibition efficiency of PFE compounds increases by increasing the concentrations of PFE, number of propylene oxide unit and with lowering temperature. The inhibition was interpreted by adsorption of PFE molecules on the Zn surface according Temkin’s isotherm. Galvanstatic polarization indicated that the PFE acts as a mixed type inhibitor. PFE molecules inhibit the pitting corrosion of Zn in a solution containing Cl– ions by moving the pitting potentials into a more noble direction. The activation thermodynamic parameters such as \(E_{{\text{a}}}^{*}\), ΔH* and ΔS* are calculated and explained.

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Funding

This research was funded by the Environmental Pollution Research Chair at Princes Noura bint Abdulrahman University (grant no. Ep-06).

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Princess Nourah bint Abdulrahman University Riyadh, Riyadh, Saudi Arabia

    M. Alfakeer

  2. Department of Chemistry, Faculty of Science, Benha University, Benha, Egypt

    M. Abdallah

  3. Department of Chemistry, Faculty of Applied Sciences, Umm Al-Qura University, Makkah, Saudi Arabia

    M. Abdallah

  4. Department of Chemistry, Faculty of Science, Al-Azhar University, 11884, Cairo, Egypt

    R. S. Abdel Hameed

  5. Department of Basic Science, Preparatory Year, Hail University, 1560, Hail, Saudi Arabia

    R. S. Abdel Hameed

Authors
  1. M. Alfakeer
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  2. M. Abdallah
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  3. R. S. Abdel Hameed
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Correspondence to M. Alfakeer.

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Alfakeer, M., Abdallah, M. & Abdel Hameed, R.S. Propoxylated Fatty Esters as Safe Inhibitors for Corrosion of Zinc in Hydrochloric Acid. Prot Met Phys Chem Surf 56, 225–232 (2020). https://doi.org/10.1134/S2070205120010025

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  • DOI: https://doi.org/10.1134/S2070205120010025

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