A chemical-free sealing method for Micro-arc oxidation coatings on AZ31 Mg alloy

Liu, Siqin; Qi, Yuming; Peng, Zenghui; Liang, Jun

doi:10.1016/j.surfcoat.2020.126655

Cited by 48 publications

(16 citation statements)

References 46 publications

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“…They were also spotted by other researchers 19,29 . The capacitive loop is caused by the charge transfer process of the electric double layer formed between substrate and solution, and the inductive loop is attributed to the fact that the pitting corrosion occurred in uncoated Mg alloy 29,34,36 . As shown in Figure 8C, the uncoated Mg alloy has a negative phase angle in the low‐frequency range, which further proves that it has pitting corrosion after immersion into SBF.…”

Section: Resultsmentioning

confidence: 68%

“…The corrosion resistance can also be evaluated from the value of | Z | in the Bode plots (see Figure 8B). The value of | Z | in the low‐frequency range can effectively evaluate the corrosion resistance of the MAO coating 34,37 . In the low‐frequency range, the | Z | value of Si+B sample is significantly higher than the values of Si and Si+P samples, which clearly shows that the corrosion rate of Si+B sample is the lowest.…”

Section: Resultsmentioning

confidence: 98%

“…As shown in Figure 8C, Bode plots with two time constants also demonstrate the impedance behavior characteristics of outer porous layer and inner dense layer/substrate interface. It is generally believed that the dimension of the capacitive loop in the low‐frequency range represents the corrosion resistance of the MAO coating 34 . The larger the dimension of capacitive loop radius is, the more difficult it is for the corrosive medium to penetrate the coating to reach the substrate; thus, the better corrosion resistance coating has 35 .…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Influences of electrolytes on tribocorrosion performance of MAO coating on AZ31B magnesium alloy in simulated body fluid

Liu

Cao

et al. 2021

Int J Applied Ceramic Tech

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In this paper, the effects of electrolytes on the corrosion resistance and tribocorrosion performance of micro‐arc oxidation (MAO) coatings on AZ31B magnesium (Mg) alloys in simulated body fluid (SBF) were studied. Scanning electron microscopy (SEM) and X‐ray diffraction (XRD) were utilized to explore the microstructure, surface morphology, and phase components of the MAO coatings. Corrosion and tribocorrosion performance of MAO coated Mg alloys were evaluated by using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and a ball‐on‐disk tribotester. It was found that MAO coating produced in electrolyte containing both Na2SiO3 and Na2B4O7 exhibited superior corrosion resistance and tribocorrosion performance in the SBF.

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Section: Resultsmentioning

confidence: 68%

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Influences of electrolytes on tribocorrosion performance of MAO coating on AZ31B magnesium alloy in simulated body fluid

Liu

Cao

et al. 2021

Int J Applied Ceramic Tech

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“…For MAO-4 alloy, no inductive reactance appears in the equivalent circuit diagram (Figure 5c), indicating that no pitting occurs in the coating and the coating structure is stable and not damaged. [26] According to Table 1, the sum value of R p and R b of MAO-4 alloy is the largest among the investigated alloys, which reflects that the charge transfer is the toughest to penetrate the MAO coating, indicating that the MAO-4 alloy has the best corrosion resistance in SBF.…”

Section: Corrosion Propertymentioning

confidence: 90%

Roles of the micro‐arc oxidation coating on the corrosion resistance and mechanical properties of extruded Mg–2Zn–0.5Zr–1.5Dy (mass%) alloy

Wen

Jin

et al. 2021

Materials & Corrosion

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Aiming to enhance the biodegradable magnesium alloys' poor mechanical properties and corrosion resistance in aggressive chloride mediums, micro‐arc oxidation coatings with oxidation times range from 3 to 15 min were prepared on the surface of extruded Mg–2Zn–0.5Zr–1.5Dy (mass%) alloy. Assessments were carried out using electrochemical experiments, hydrogen evolution experiments, and tensile tests, respectively. The results show that the micro‐arc oxidation coating is porous and mainly consists of the MgO phase. When the oxidation time increases from 3 to 15 min, the thickness and the pore size of the coating increase, while the coating's porosity decreases. The coating with the oxidation time of 15 min can effectively prevent the formation of pitting holes on the surface of the alloy, which remarkably reduces the decay rate of ultimate tensile strength, yield strength, and elongation of the alloy after immersion in simulated body fluid for 0–28 days, and keep the alloy with higher and more stable corrosion resistance. This increases the application possibility of extruded Mg–2Zn–0.5Zr–1.5Dy alloy as a biodegradable material.

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“…As the lightest metallic structural materials (1.30-1.65 g/cm 3 ), Mg-Li alloys have been widely used in space fields (Wu et al, 2020a;Wu et al, 2020b). In order to satisfy the functional requirements and adapt to the space environment, it needs to take out surface treatment such as plating, oxidation, and coatings for Mg-Li alloys (Xia et al, 2019;Zhang et al, 2019;Liu et al, 2021). However, due to the electrochemical activity of Mg and Li, the alloys have great corrosion risks in the service environment (Prando et al, 2019;Sun et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Corrosion Initiation Behavior of Thermal Control Oxidation Film of LA103Z Alloy

et al. 2021

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The magnesium lithium thermal control oxidation is a commonly used conductive anti-corrosion treatment method for aerospace. The corrosion behaviors of thermal control oxidation films for LA103Z alloys were studied in 3.5% NaCl solution. The corrosion characteristics with different immersion time were characterized by using scanning electron microscopy, energy spectroscopy, and electrochemical methods. The results showed that the corrosion of Mg-Li alloy with chemical oxidation film starts from pitting corrosion, gradually expands in depth in the early stage, forms corrosion holes, and then gradually develops into river-like morphology. In the last stage, the increasing corrosion products slow down the corrosion rate and gradually covers the entire sample surface. The corrosion product mainly consists of MgO, LiF, and MgCl2. Combined with the electrochemical characteristics, the corrosion mechanism was investigated.

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A chemical-free sealing method for Micro-arc oxidation coatings on AZ31 Mg alloy

Cited by 48 publications

References 46 publications

Influences of electrolytes on tribocorrosion performance of MAO coating on AZ31B magnesium alloy in simulated body fluid

Influences of electrolytes on tribocorrosion performance of MAO coating on AZ31B magnesium alloy in simulated body fluid

Roles of the micro‐arc oxidation coating on the corrosion resistance and mechanical properties of extruded Mg–2Zn–0.5Zr–1.5Dy (mass%) alloy

Corrosion Initiation Behavior of Thermal Control Oxidation Film of LA103Z Alloy

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