Effect of Anode Pulse-Width on the Microstructure and Wear Resistance of Microarc Oxidation Coatings

Li, Zhenwei; Di, Shichun

doi:10.3390/met7070243

Cited by 6 publications

(5 citation statements)

References 28 publications

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“…In addition, in the process of plasma electrolytic oxidation, the expansion coefficients and directions of each oxide phase are different, and the melting and solidification of the sample surface is usually accompanied by a certain volume change, which results in the generation of thermal stress and cracks. Since the micropore is the center of stress concentration, the crack usually passes through the micropores [21][22][23]. Figure 2b,c depict the surface morphology of the Cr layer and ZrO2/Cr bilayer coating, showing similar morphology and indicating that a smooth and dense Cr layer was deposited on the surface of the original and ZrO2-coated Zr-4 alloy, while some small particles were observed on the surface.…”

Section: Morphologymentioning

confidence: 95%

Corrosion and Wear Properties of Cr Coating and ZrO2/Cr Bilayer Coating on Zr-4 Alloy

Pan

Qiu

et al. 2022

Coatings

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In this study, duplex surface treatments were used to prepare a ZrO2/Cr bilayer coating on zirconium alloy cladding for enhancing the wear and corrosion behaviors. The surface and cross-section morphology of coated Zr-4 alloy was characterized; the results show that the Cr- and ZrO2/Cr-coated samples had similar morphology, and more obvious surface undulates could be observed on the ZrO2/Cr coating than the pure Cr coating owing to the rough surface of the plasma electrolytic oxidation coating. Wear and electrochemical behavior in 1200 mg/L H3BO3 and 2.2 mg/L LiOH solutions of original and coated Zr-4 alloy were investigated. The electrochemical corrosion test indicated the coated Zr-4 alloy exhibited better corrosion resistance behavior than the original Zr-4 alloy. The potentiodynamic polarization curves and corrosion morphology suggest the pitting corrosion occurred on the surface of the original and coated Zr-4 alloy. The ZrO2/Cr-coated Zr-4 alloy had better corrosion resistance due to the dual protection of the PEO layer and Cr coating. The wear behavior of the original and coated Zr-4 alloy was also investigated under a constant load of 5 N. The results reveal that the coated Zr-4 alloy had better wear resistance, and the PEO layer was found to significantly enhance the wear resistance of the Zr-4 alloy.

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Section: Morphologymentioning

confidence: 95%

Corrosion and Wear Properties of Cr Coating and ZrO2/Cr Bilayer Coating on Zr-4 Alloy

Pan

Qiu

et al. 2022

Coatings

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“…This is related to the content of the rutile phase with higher hardness in the film layer and the density of the film layer. The higher the rutile content, the higher the overall hardness, the smaller the mass loss during the wear process, and the better the wear resistance [21]. The higher the density, the fewer holes and cracks, and the better the wear resistance.…”

Section: Wear Resistancementioning

confidence: 99%

Study on Preparation of Micro-Arc Oxidation Film on TC4 Alloy with Titanium Dioxide Colloid in Electrolyte

Lü

Chen

et al. 2022

Coatings

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The micro-arc oxidation film on TC4 alloy was prepared using a multifunctional micro-arc oxidation (MAO) power source. The effect of nano-titania colloid addition on the growth process, microstructure, and comprehensive mechanical properties of titanium alloy micro-arc oxidation films was studied by gradient concentration. The results show that, with the increase in titanium dioxide colloid content, the intensity of the discharge phenomenon during the MAO process increases, and the average current density gradually increases. The film thickness is gradually increased from 111.06 μm to 159.8 μm, and the roughness first decreases and then increases. The XRD results show that the rutile content in the film layer is increased with titanium dioxide colloid in the electrolyte. This resulted in an increase in the density of the film, and lead to the corrosion resistance of film improved. When the concentration of titanium dioxide colloid is 1.5 g/L, the comprehensive performance of the film is the best.

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“…In addition, the composition, structure, and properties of coatings produced by the MAO process depend on various parameters, among which chemical composition and electrolyte concentration are the most important [24][25][26]. The microstructures and properties of diverse composites have also been extensively investigated in plenty of reviews and books [27][28][29][30].Generally, composites are added into the electrolyte to improve the tribological performances of aluminum alloys, since they are able to compact the coating by filling in the microcracks and micropores of the MAO coating [31,32], sealing the surface or reacting with the aluminum ion as the coating forming matter [33,34].However, these techniques are linked with certain shortcomings [35,36]:…”

mentioning

confidence: 99%

mentioning

confidence: 99%

“…The microstructures and properties of diverse composites have also been extensively investigated in plenty of reviews and books [27][28][29][30]. Generally, composites are added into the electrolyte to improve the tribological performances of aluminum alloys, since they are able to compact the coating by filling in the microcracks and micropores of the MAO coating [31,32], sealing the surface or reacting with the aluminum ion as the coating forming matter [33,34].…”

mentioning

confidence: 99%

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

Song

Jiang

2019

Materials

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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.

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Effect of Anode Pulse-Width on the Microstructure and Wear Resistance of Microarc Oxidation Coatings

Cited by 6 publications

References 28 publications

Corrosion and Wear Properties of Cr Coating and ZrO2/Cr Bilayer Coating on Zr-4 Alloy

Corrosion and Wear Properties of Cr Coating and ZrO2/Cr Bilayer Coating on Zr-4 Alloy

Study on Preparation of Micro-Arc Oxidation Film on TC4 Alloy with Titanium Dioxide Colloid in Electrolyte

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

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