Microstructure and wear resistance of micro-arc oxidation ceramic coatings prepared on 2A50 aluminum alloys

Li, Xiaojing; Zhang, Min; Wen, Song; Mao, Xinyu; Huo, W. G.; Guo, Yuanyuan; Wang, Yuxin

doi:10.1016/j.surfcoat.2020.125853

Cited by 57 publications

(37 citation statements)

References 29 publications

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“…It is known that the micro-hardness of the PEO coatings is related to the surface structure and phase composition [ 28 ]. On the basis of the SEM results, the P60 and Al60 coatings are thicker and denser than the P30 and Al30 coatings.…”

Section: Resultsmentioning

confidence: 99%

“…As we can see from the curves, the friction coefficient of the PEO coatings fluctuates with the sliding time. There is a run-in stage in the friction process, which may be concerned with the irregular surface morphology of the coatings [ 28 ]. The run-in stages of all the samples are about 200 s, and the friction coefficient became stable within the range from 0.75 to 0.85, as observed in Figure 7 .…”

Section: Resultsmentioning

confidence: 99%

“…In addition, it can be deduced from Figure 5 that the microhardness of PEO coatings grown in the same electrolyte increases with the increase of the treatment time; that is, the greater the thickness of the PEO coating, the higher the hardness. It is known that the micro-hardness of the PEO coatings is related to the surface structure and phase composition [28]. On the basis of the SEM results, the P60 and Al60 coatings are thicker and denser than the P30 and Al30 coatings.…”

Section: Micro-hardness Of the Coatingsmentioning

confidence: 99%

“…In addition, these PEO coatings still exist after a wear test for 1800 s, indicating that those coatings have excellent wear resistance. It is known that the micro-hardness of the PEO coatings is related to the surface structure and phase composition [28]. On the basis of the SEM results, the P60 and Al60 coatings are thicker and denser than the P30 and Al30 coatings.…”

Section: Friction and Wear Properties Of The Coatingsmentioning

confidence: 99%

“…Obviously, the surface morphology of the P60 and Al60 coatings gradually becomes rough and compact, and the number of micro-cracks also increases accordingly. The formation of micro-cracks could be caused by thermal stress on the solidification process of the molten oxide and the different phase expansion coefficients of the coating [27,28]. In addition, the surface characteristics of PEO coatings also change observably with treating time.…”

Section: Morphologies Of the Coatingsmentioning

confidence: 99%

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Wear and Corrosion Resistance of Plasma Electrolytic Oxidation Coatings on 6061 Al Alloy in Electrolytes with Aluminate and Phosphate

Peng

Liu

et al. 2021

Materials

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Phosphate and aluminate electrolytes were used to prepare plasma electrolytic oxidation (PEO) coatings on 6061 aluminum alloy. The surface and cross-section microstructure, element distribution, and phase composition of the PEO coatings were characterized by SEM, EDS, XPS, and XRD. The friction and wear properties were evaluated by pin-on-disk sliding tests under dry conditions. The corrosion resistance of PEO coatings was investigated by electrochemical corrosion and salt spray tests in acidic environments. It was found that the PEO coatings prepared from both phosphate and aluminate electrolytes were mainly composed of α-Al2O3 and γ-Al2O3. The results demonstrate that a bi-layer coating is formed in the phosphate electrolyte, and a single-layered dense alumina coating with a hardness of 1300 HV is realizable in the aluminate electrolyte. The aluminate PEO coating had a lower wear rate than the phosphate PEO coating. However, the phosphate PEO coating showed a better corrosion resistance in acidic environment, which is mainly attributed to the presence of an amorphous P element at the substrate/coating interface.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Micro-hardness Of the Coatingsmentioning

confidence: 99%

Section: Friction and Wear Properties Of The Coatingsmentioning

confidence: 99%

Section: Morphologies Of the Coatingsmentioning

confidence: 99%

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