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. 2019 Dec 16;12(24):4226.
doi: 10.3390/ma12244226.

Improving the Tribological Performance of MAO Coatings by Using a Stable Sol Electrolyte Mixed with Cellulose Additive

Wei Song  1   2 , Bailing Jiang  1 , Dongdong Ji  1
Affiliations

Improving the Tribological Performance of MAO Coatings by Using a Stable Sol Electrolyte Mixed with Cellulose Additive

Wei Song et al. Materials (Basel). .

Abstract

In this study, micro-arc oxidation (MAO) of aluminum 6061 alloy was carried out within a silicate base electrolyte containing 0.75 g/L of cellulose, and the tribological properties of the coating were investigated. The as-prepared coating was detected by Fourier Transform Infrared Spectroscopy (FTIR), X-ray diffraction (XRD), a scanning electron microscope (SEM) and an energy-dispersive spectrometer (EDS), respectively. The results suggested that cellulose filled in the microcracks and micropores, or it existed by cross-linking with Al3+. In addition, it was found that the cellulose had little effect on the coating hardness. However, the thickness and roughness of the coating were improved with the increase in cellulose concentration. Moreover, the ball-on-disk test showed that the friction coefficient, weight loss and wear rate of the MAO coating decreased with the increase in cellulose concentration. Further, the performances of the coatings obtained in the same electrolyte, under different preserved storage periods, were compared, revealing that the cellulose was uniformly dispersed in the electrolyte and improved the tribological properties of the MAO coating within 30 days.

Keywords: MAO (micro-arc oxidation) coating; cellulose; self-lubricating; stability; tribological performance.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
The anti-friction mechanism of cellulose improves the micro-arc oxidation (MAO) coating.
Figure 2
Figure 2
Effects of cellulose content on the thickness and roughness of the MAO coating.
Figure 3
Figure 3
Microsurface of the MAO coating at cellulose concentrations of (a) 0 g/L, (b) 0.25 g/L, (c) 0.50 g/L, and (d) 0.75 g/L.
Figure 4
Figure 4
Cross-section of the MAO coating at cellulose concentrations of (a) 0 g/L, (b) 0.25 g/L, (c) 0.50 g/L, and (d) 0.75 g/L.
Figure 5
Figure 5
Micrograph illustrating the zone of energy-dispersive spectrometer (EDS) analysis.
Figure 6
Figure 6
Fourier transform infrared (FT-IR) spectra of the MAO coatings obtained at different cellulose contents.
Figure 7
Figure 7
X-ray diffraction (XRD) spectra of the MAO coatings obtained at different cellulose contents.
Figure 8
Figure 8
Friction coefficients of the MAO coatings obtained at different cellulose contents.
Figure 9
Figure 9
Friction coefficients of the MAO coatings under different storage periods.
See this image and copyright information in PMC

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