Characterization of Micro-arc Oxidation Coatings on 6N01 Aluminum Alloy Under Different Electrolyte Temperature Control Modes

Wang, Xuefei; Zhu, Zhiwu; Li, Yuanxing; Chen, Hui

doi:10.1007/s11665-018-3313-y

Cited by 6 publications

(5 citation statements)

References 16 publications

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“…Figure 2(f) illustrates that the SiC coating is the thickest (8.83–10.20 μm) and the MAO coating in Figure 2(e) is the thinnest (7.11–8.20 μm), which indicates that the addition of nano-SiC could thicken the coating. During the MAO process, micro-arc plasma discharge generated high temperature and pressure, which caused chemical oxidation, electrochemical oxidation and plasma oxidation to occur simultaneously on the surface of the alloy (Wang et al , 2018). The coating grew directly on the substrate, so that it could be closely bonded with the substrate.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 2 shows the micromorphology and the element composition of the two coatings. The different cooling rates of the molten oxide and the different gas escape rates during the MAO reaction make both coatings have microporous oxidation and plasma oxidation to occur simultaneously on the surface of the alloy (Wang et al, 2018). The coating grew directly on the substrate, so that it could be closely bonded with the substrate.…”

Section: Characteristics Of Mao Coatingsmentioning

confidence: 99%

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Local electrochemical corrosion performance of nano-SiC/MAO composite coating on 6061-Al alloy

Liu

Jie²,

Yang³

et al. 2022

ACMM

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Purpose The purpose of this paper is to improve the corrosion resistance of the 6061-Al alloy as the battery pack material for electric vehicles, and the nano-SiC/MAO composite coating was prepared. Design/methodology/approach The corrosion resistance of coatings was evaluated by the global electrochemical test, and the local electrochemical impedance spectroscopy (LEIS) was used to study the local corrosion mechanism. The laser confocal microscope, scanning electron microscope and X-ray diffractometer (XRD) were used to characterise coatings. Findings Results showed that the impedance of nano-SiC/MAO coating was 1–2 times higher than MAO coating, and the main corrosion product was Al(OH)3. LEIS results showed that the impedance of the nano-SiC/MAO coating was two times higher than the MAO coating. The defective SiC/Micro-arc oxidation coating still had high corrosion resistance compared to the MAO coating. Originality/value The physical model of the local corrosion mechanism for SiC/MAO composite coating in “cavity-fracture collapse” mode was proposed.

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Section: Resultsmentioning

confidence: 99%

Section: Characteristics Of Mao Coatingsmentioning

confidence: 99%

Local electrochemical corrosion performance of nano-SiC/MAO composite coating on 6061-Al alloy

Liu

Jie²,

Yang³

et al. 2022

ACMM

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“…Until the electrolyte was boiling, the noise suddenly decreased. The properties of the coatings were also different compared to those formed under conventional control mode of the electrolyte temperature [9].…”

Section: Micro-arc Oxidation (Mao) Has Been An Attractive Electrochem...mentioning

confidence: 90%

Discharge Characteristic of Micro-Arc Oxidation on Aluminum Alloy under the Changing Electrolyte Temperature

Yang¹,

Wang²,

Zhu³

et al. 2022

MSCE

Self Cite

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The electrolyte temperature has a great influence on the performance of the coating prepared by micro-arc oxidation (MAO). The behavior of MAO discharge in the changing electrolyte temperature has been investigated. Compared to constant electrolyte temperature in conventional MAO process, the process has different discharge characteristics under the changing electrolyte temperature. The amplitude of pulse voltage was detected to study the change of discharge characteristic under the constant-current control of MAO power supply. Three successive discharge stages were differentiated by the variable the pulse voltage versus process time. Since there were significant changes in the sound, the sound signals were acquired and the audio analysis was used to describe the changing of the MAO discharge at different stages. Optical emission spectroscopy (OES) was employed in situ to unveil how the micro-discharge changed with the temperature increasing. Scanning electron microscopy (SEM) was used to characterize the morphology of the coatings on 6N01 aluminum alloy prepared by normal process with the constant-temperature control of the MAO electrolyte and by the process under the changing electrolyte temperature. A mode of film growth and microdischarge was given to describe the effects of the changing electrolyte temperature in the whole MAO process.

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“…During the MAO process, with continuously applied electric field, the plasma micro-area arc discharge continues to occur randomly. Finally, an oxide ceramic coating is in-situ formed on the surface of the anode sample [34][35][36]. In this study, the hot-dipped Al-Si alloy layer (anode) of the outer layer of a TA2 substrate was in-situ oxidized to form an oxide ceramic coating through an MAO process.…”

Section: Discussionmentioning

confidence: 99%

Micrographic Properties of Composite Coatings Prepared on TA2 Substrate by Hot-Dipping in Al–Si Alloy and Using Micro-Arc Oxidation Technologies (MAO)

Wang

Zhou

et al. 2020

Coatings

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A composite coating composed of intermetallic compounds, Al–Si alloys, and an oxide ceramic layer was prepared on TA2 substrate by hot-dipping Al–Si alloy and micro-arc oxidation (MAO) methods. The microstructure and composition distribution of the resulting hot-dipped Al–Si alloy layer and MAO-caused ceramic layer were studied by scanning electron microscope (SEM) and energy dispersive spectrum (EDS). In addition, the phase composition of the diffusion layer obtained by the Al–Si alloy hot-dipping procedure was investigated by electron backscattered diffraction (EBSD), and the phase structure of the MAO-treated layer was studied by X-ray diffraction (XRD) analysis and X-ray photoelectron spectroscopy (XPS). The MAO method can make the hot-dipped Al–Si alloy layer in-situ oxidized to form a ceramic layer. Finally, a three-layer composite coating composed of a diffusion layer formed by the Ti–Al–Si interdiffusion, an Al–Si alloy layer and a ceramic layer was prepared on TA2 substrate. Compared with TA2 substrate, the TA2 sample with a three-layer composite coating has larger friction coefficient and less abrasion loss. The three-layer composite coating can significantly improve the wear resistance of TA2. A technical composite method was developed to the low cost in-situ growth of alumina-based ceramic wear-resistant coatings on TA2 substrate.

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Characterization of Micro-arc Oxidation Coatings on 6N01 Aluminum Alloy Under Different Electrolyte Temperature Control Modes

Cited by 6 publications

References 16 publications

Local electrochemical corrosion performance of nano-SiC/MAO composite coating on 6061-Al alloy

Local electrochemical corrosion performance of nano-SiC/MAO composite coating on 6061-Al alloy

Discharge Characteristic of Micro-Arc Oxidation on Aluminum Alloy under the Changing Electrolyte Temperature

Micrographic Properties of Composite Coatings Prepared on TA2 Substrate by Hot-Dipping in Al–Si Alloy and Using Micro-Arc Oxidation Technologies (MAO)

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