Developing a safe and long-lasting protective coating for metal surfaces is crucial for various industrial applications. One solution is to add self-healing mechanisms to the coating, which provides a barrier to harmful environments and releases corrosion inhibitors. In the present study, a new self-healing coating with microcapsules containing honey was examined using scanning electron microscopy and the chemical composition of the microcapsules was analysed via Fourier transform infrared spectroscopy. The coating was made of epoxy resin with microcapsules containing honey. The effect of these microcapsules on the corrosion behaviour of self-healing coatings applied to AZ31 magnesium alloys in a chloride environment was investigated utilizing potentiodynamic polarization and electrochemical impedance spectroscopy. A scratch test was performed to evaluate the self-healing capability of the coating. After four days, the coating showed complete healing, with no corrosion detected, indicating the effective action of honey both during the healing process and as a corrosion inhibitor. The potentiodynamic polarization results demonstrated that honey improved the corrosion inhibition efficiency to nearly 100% and reduced the corrosion current density by 99.7%, indicating active corrosion protection by honey. Thus, the excellent self-healing capability and high corrosion resistance of the self-healing coating with honey make it a promising and reliable long-term protective solution for magnesium alloys.

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Corrosion Resistance of Honey-Containing Microcapsules in Self-healing Epoxy-Coated AZ31 Magnesium Alloys

  • Juliawati Alias,
  • Nurul Amiratul Johari,
  • Muhammad Hafizuddin Alias,
  • Nasrul Azuan Alang,
  • Mas Ayu Hassan

摘要

Developing a safe and long-lasting protective coating for metal surfaces is crucial for various industrial applications. One solution is to add self-healing mechanisms to the coating, which provides a barrier to harmful environments and releases corrosion inhibitors. In the present study, a new self-healing coating with microcapsules containing honey was examined using scanning electron microscopy and the chemical composition of the microcapsules was analysed via Fourier transform infrared spectroscopy. The coating was made of epoxy resin with microcapsules containing honey. The effect of these microcapsules on the corrosion behaviour of self-healing coatings applied to AZ31 magnesium alloys in a chloride environment was investigated utilizing potentiodynamic polarization and electrochemical impedance spectroscopy. A scratch test was performed to evaluate the self-healing capability of the coating. After four days, the coating showed complete healing, with no corrosion detected, indicating the effective action of honey both during the healing process and as a corrosion inhibitor. The potentiodynamic polarization results demonstrated that honey improved the corrosion inhibition efficiency to nearly 100% and reduced the corrosion current density by 99.7%, indicating active corrosion protection by honey. Thus, the excellent self-healing capability and high corrosion resistance of the self-healing coating with honey make it a promising and reliable long-term protective solution for magnesium alloys.