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MWCNTs and Al2O3 nanoparticles assembled into silane sol-gel ceramic multi-layer coating to improve surface performance of the magnesium alloy

  • Original Paper: Functional coatings, thin films and membranes (including deposition techniques)
  • Published:
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Abstract

This paper reports the successful deposition of mono- and double-layer coatings of silane-Al2O3/multi-walled carbon nanotube (MWCNT) nanocomposites on magnesium alloy (AZ91) by sol-gel dip coating technique to improve the corrosion behavior. Scanning electron microscopy, atomic force microscopy, electrochemical impedance spectroscopy, and potentiodynamic polarization techniques were utilized to assess the protective performance of the coatings with various MWCNT contents (0.02, 0.05, 0.1, and 0.15 wt.%) and constant Al2O3 concentration (2 wt.%). The incorporation of an optimal amount of MWCNTs (0.1 wt.%) into the mono-layer coating led to corrosion resistance with polarization resistance and roughness of 183.4 kΩcm2 and 23.97 nm, respectively. In the case of the double-layer coatings, 0.15 wt.% MWCNT was the optimal value as it significantly increased the polarization resistance (349.6 kΩcm2) and reduced the roughness (5.58 nm), and cracking. The mentioned coating system can be a promising candidate to protect AZ91 magnesium alloy against corrosion.

Graphical Abstract

Image (a) shows the cross-sectional FE-SEM micrograph of the double-layer coating at the magnification of 1000×. Image (b) depicts a region zoomed in image (a) with magnification of 10000×. Image (c) illustrates a coating surface as a zoom in image of (b) with magnification of 25000×.

Highlights

  • Using the 0.1 wt.% MWCNTs into monolayer coating led to improve corrosion behavior.

  • Using the 0.15 wt.% MWCNTs into double-layer coating improved the corrosion conduct.

  • Roughness of the double-layer coatings was reduced by increasing the MWCNTs.

  • Roughness of the mono-layer coatings raised up to 0.1 wt.% followed by a decrement.

  • Double layer coating containing 0.15 wt.% MWCNTs could be more protective system.

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Correspondence to Mohammad Reza Tohidifar.

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Koozegari, M.S., Tohidifar, M.R. MWCNTs and Al2O3 nanoparticles assembled into silane sol-gel ceramic multi-layer coating to improve surface performance of the magnesium alloy. J Sol-Gel Sci Technol 107, 569–585 (2023). https://doi.org/10.1007/s10971-023-06181-z

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  • DOI: https://doi.org/10.1007/s10971-023-06181-z

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