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. 2023 Nov 15;9(11):e22435.
doi: 10.1016/j.heliyon.2023.e22435. eCollection 2023 Nov.

The effect of silica NPs incorporation on protective properties of oxide layers formed by PEO on Mg97Y2Zn1 alloy with LPSO-phase

M M Krishtal  1 , A V Katsman  1   2 , A V Polunin  1 , A O Cheretaeva  1
Affiliations

The effect of silica NPs incorporation on protective properties of oxide layers formed by PEO on Mg97Y2Zn1 alloy with LPSO-phase

M M Krishtal et al. Heliyon. .

Abstract

The inherited chemical inhomogeneity in oxide layers obtained by plasma electrolytic oxidation (PEO) on the magnesium alloy Mg97Y2Zn1 is associated to long-period stacking-ordered (LPSO) phase present in the treated alloy. This heterogeneity results in decrease of corrosion resistance and adhesion strength. The problem was solved by adding silica nanoparticles (NPs) into the electrolyte under PEO. According to the model developed, NPs which are harder than the oxide layer and being electrically charged, can be accelerated by an electric field and penetrate deep into the layer. The near-surface incorporation of NPs results in branching of the local breakdowns of vapor-gas bubbles that leads to an increase of the volumes of oxide layer and improvement of its properties.

Keywords: Coating; Colliding interaction; Nanoparticles; Plasma electrolytic oxidation.

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Conflict of interest statement

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Figures

Fig. 1
Fig. 1
Time dependencies of anodic (Ua) and cathodic (Uc) forming voltages under PEO treatment of Mg97Y2Zn1 alloy in the case of base electrolyte (without n-SiO2) and with addition of SiO2 NPs.
Fig. 2
Fig. 2
Cross-section structure (a, b) and morphology of the surface (SEM, BSE) (c, d) of the layers obtained by PEO without (a, c) and with (b, d) n-SiO2 addition.
Fig. 3
Fig. 3
The distribution maps of the main elements over the cross-sections (a, b) and on the surfaces (c, d) of the specimens obtained by PEO without (a, с) and with (b, d) n-SiO2 addition.
Fig. 3
Fig. 3
The distribution maps of the main elements over the cross-sections (a, b) and on the surfaces (c, d) of the specimens obtained by PEO without (a, с) and with (b, d) n-SiO2 addition.
Fig. 4
Fig. 4
XRD patterns of the Mg97Y2Zn1 magnesium alloy samples with the oxide layers obtained by PEO in the base electrolyte (without silica NPs) and with n-SiO2 additions to the electrolyte (a) and corresponding pattern's zones with broad peak (amorphous halos marked by grey) (b).
Fig. 5
Fig. 5
Tafel plots (a), Nyquist plots (b), Bode plots (c) and phase angle plots (d) of the obtained specimens.
See this image and copyright information in PMC

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