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. 2023 Dec 15;16(24):7673.
doi: 10.3390/ma16247673.

Corrosion-Resistive ZrO2 Barrier Films on Selected Zn-Based Alloys

Irina Stambolova  1 , Daniela Stoyanova  1 , Maria Shipochka  1 , Nelly Boshkova  2 , Silviya Simeonova  3 , Nikolay Grozev  3 , Georgi Avdeev  2 , Ognian Dimitrov  4 , Nikolai Boshkov  2
Affiliations

Corrosion-Resistive ZrO2 Barrier Films on Selected Zn-Based Alloys

Irina Stambolova et al. Materials (Basel). .

Abstract

This work presents the enhanced corrosion resistance of newly developed two-layer composite coatings deposited on low-carbon steel: electrodeposited zinc alloy coatings (Zn-Ni with 10 wt.% Ni (ZN) or Zn-Co with 3 wt.% Co (ZC), respectively) and a top ZrO2 sol-gel layer. Surface morphology peculiarities and anti-corrosion characteristics were examined using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDX), atomic force microscopy (AFM), water contact angle (WCA) measurements, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) analyses, potentiodynamic polarization (PDP) curves, corrosion potential (Ecorr), polarization resistance (Rp) measurements (for a prolonged period of 25 days) and open-circuit potential (OCP). The results were compared with the corrosion peculiarities of usual zinc coating. The zirconia top coatings in both systems were amorphous and dense, possessing hydrophobic nature. The experimental data revealed an increased corrosion resistance and protective ability of the ZC system in comparison to that of ZN due to its smooth, homogeneous surface and the presence of poorly crystallized oxides (ZnO and Co3O4), both later playing the role of a barrier for corrosive agents.

Keywords: corrosion resistance; structure; surface morphology; zinc alloy coatings; zirconium oxide films.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
SEM analyses of the (a) Zn–Ni and (b) Zn–Co sub-layers (magnification 1000).
Figure 2
Figure 2
EDX/SEM analyses of the System ZN (magnification 1000).
Figure 3
Figure 3
EDX/SEM analyses of the System ZC (magnification 1000).
Figure 4
Figure 4
AFM 2D and 3D images of LCS (left); LCS/Zn (right).
Figure 5
Figure 5
AFM (2D and 3D) images of Zn–Ni substrate.
Figure 6
Figure 6
AFM images (2D and 3D) of System ZN and hydrophobicity of the surface.
Figure 7
Figure 7
AFM images (2D and 3D) of Zn–Co substrate.
Figure 8
Figure 8
AFM images (2D and 3D) of System ZC and hydrophobicity of the surface.
Figure 9
Figure 9
XRD of System ZN.
Figure 10
Figure 10
XRD of System ZC.
Figure 11
Figure 11
Deconvolution of Zr3d (a) ZN sample and (b) ZC sample and (c) Zn2p core level spectra of the systems.
Figure 12
Figure 12
Deconvolution of O1s core level spectra of (a) ZN and (b) ZC systems.
Figure 13
Figure 13
Polarization resistance of the investigated samples in 5% NaCl solution.
Figure 14
Figure 14
Potentiodynamic polarization curves of the fresh samples in 5% NaCl solution (vs. SCE).
Figure 15
Figure 15
Potentiodynamic polarization curves of the investigated samples after 25 days of continuous immersion in 5% NaCl solution (vs. SCE).
Figure 16
Figure 16
Open-circuit potential (OCP) values of the investigated samples after 25 days of immersion in 5% NaCl solution (vs. SCE).
See this image and copyright information in PMC

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