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Research Article

Hydrothermal synthesis of Zn-Mg based layered double hydroxide coating over copper for its corrosion prevention in both chloride and hydroxide media

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  • Received: 3 March 2020Revised: 4 June 2020Accepted: 18 June 2020Available online: 21 June 2020
  • Layered double hydroxides (LDHs) can be very interesting materials in corrosion inhibition applications as LDHs stops the corrosive elements by its ability of double layer formation and locking them between its layers. In this work, Zn-Mg based LDHs are grown over copper substrate by hydrothermal method. Two types of Zn-Mg based LDHs have been prepared based on hydrothermal reaction time. Both LDHs have been characterized by Fourier transform infrared spectroscopy, Raman spectroscopy, high resolution scanning electron microscopy, energy dispersive X-ray analysis, atomic force microscopy and X-ray diffraction patterns. The results show that LDHs are successfully grown on copper; however, they are found different in terms of thickness and structural configuration. Corrosion testing of LDHs has been executed both in 0.1 M NaCl and 0.1 M NaOH by ac impedance measurements and Tafel polarization curves. The results show that L48 gives more than 90% protection to copper, which is higher than protection provided by L24. However, it is evident that both LDH (L24 and L48) is more effective in NaCl, in terms of reduction of corrosion. This information indicates that LDH is more efficient to exchange Cl- ions than OH- ions.
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Hydrothermal synthesis of Zn-Mg based layered double hydroxide coating over copper for its corrosion prevention in both chloride and hydroxide media

  • Corresponding author:

    Gopal Ji    E-mail: gopal.ji.ji@gmail.com;gopalji@cas.res.in

  • 1. School of Materials Science and Technology, Indian Institute of Technology (BHU) Varanasi, Varanasi-221005, Uttar Pradesh, India
  • 2. Centre for advanced studies, APJAKTU Lucknow, U.P. -226031, India

Abstract: Layered double hydroxides (LDHs) can be very interesting materials in corrosion inhibition applications as LDHs stops the corrosive elements by its ability of double layer formation and locking them between its layers. In this work, Zn-Mg based LDHs are grown over copper substrate by hydrothermal method. Two types of Zn-Mg based LDHs have been prepared based on hydrothermal reaction time. Both LDHs have been characterized by Fourier transform infrared spectroscopy, Raman spectroscopy, high resolution scanning electron microscopy, energy dispersive X-ray analysis, atomic force microscopy and X-ray diffraction patterns. The results show that LDHs are successfully grown on copper; however, they are found different in terms of thickness and structural configuration. Corrosion testing of LDHs has been executed both in 0.1 M NaCl and 0.1 M NaOH by ac impedance measurements and Tafel polarization curves. The results show that L48 gives more than 90% protection to copper, which is higher than protection provided by L24. However, it is evident that both LDH (L24 and L48) is more effective in NaCl, in terms of reduction of corrosion. This information indicates that LDH is more efficient to exchange Cl- ions than OH- ions.

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