Characterization of the corrosion performances of as‐cast Mg–Al and Mg–Zn magnesium alloys with microarc oxidation coatings

Xue, Yuna; Pang, Xin; Jiang, Bailing; Jahed, Hamid; Wang, Di

doi:10.1002/maco.201911384

Cited by 17 publications

(10 citation statements)

References 45 publications

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“…In general, Fe, Ni, and Cu exist as impurities in Mg-based alloys, which act as highly polarized local cathodes with respect to Mg and accelerate the degradation rate [4]. Moreover, a low Pilling-Bedworth (PB) ratio of MgO/Mg (0.81) leads to the formation of a loose oxide/hydroxide film on the surface, which increases the degradation rate [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

[Retracted] Influence of Al Content on Degradation Behavior of Cu‐Doped Mg‐Al Alloys for Drill‐Free Plugging Applications

Kang

Shi

Luo

et al. 2020

Advances in Materials Science and Engineering

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Herein, we report low-cost and rare-earth-free Cu-doped Mg-Al alloys for drill-free plugging applications and present the influence of Al content on degradation behavior. The phase composition and microstructure of fabricated alloys were characterized by using a scanning electron microscope (SEM) and X-ray diffractometer (XRD). Also, degradation properties were investigated using hydrogen evolution tests and the electrochemical measurements. The results reveal that the Al content is directly related to the proportion of secondary phases, such as Mg2Cu, Mg17Al12, and MgAlCu. Moreover, the Mg17Al12 and MgAlCu phases are distributed at α-Mg grain boundaries, whereas the MgAlCu phase is distributed within the Mg matrix. Acceleration of degradation rate is found due to microgalvanic corrosion in Mg-xAl-2Cu (in wt.%, named as ACx2, x = 0, 3, 5, and 9) alloys. In this regard, Mg2Cu, Mg17Al12, and MgAlCu phases act as a microgalvanic cathode against anodic magnesium matrixes. As such, the degradation rate of ACx2 alloys in 3.5% NaCl solution is ranked from AC02, AC32, AC52, to AC92. In this context, the AC02 alloy shows the fastest degradation rate, 46 times higher than the AC92 alloy. This may provide a practical solution to develop good alternatives for drill-free plugging materials.

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Section: Introductionmentioning

confidence: 99%

[Retracted] Influence of Al Content on Degradation Behavior of Cu‐Doped Mg‐Al Alloys for Drill‐Free Plugging Applications

Kang

Shi

Luo

et al. 2020

Advances in Materials Science and Engineering

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“…[3,4] The application of high-quality surface barrier layers can effectively improve the corrosion resistance of magnesium alloys, such as protective layers obtained by chemical conversion treatment, micro-arc oxidation treatment, electroplating, and electroless plating. [5][6][7] Chemical conversion treatment has been widely developed due to the concise preparation process. Rare earth conversion coatings are some of the most promising substitutes for traditional chromate conversion coatings, which is a toxic compound and has been prohibited from being used at present.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and properties of the superhydrophobic ceria‐based composite coating on magnesium alloy

Yuan

et al. 2021

Materials & Corrosion

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A superhydrophobic ceria‐based composite coating is developed to improve anticorrosion properties of AZ61 magnesium alloy, fabricating via chemical conversion method followed by hydrothermal treatment. The cerium conversion coating has a block structure with microcracks. After the hydrothermal treatment, a dense CeO2 layer, porous CeO2 nanorods, and stearic absorbing layers are grown stepwise on the conversion coating. And the composite coating is hydrophobic or even superhydrophobic and has almost no microcracks. As the hydrothermal reaction time increases, the water contact angle of the composite coating first increases and then decreases, and it reaches the maximum value of 152° after hydrothermal treatment for 4 h. Both the dense CeO2 layer and the superhydrophobic stearic absorbing layer can effectively prevent the electrolyte from contacting the substrate; the corrosion current density of the superhydrophobic composite coating is lower than that of the hydrophilic composite coating and the cerium conversion coating, and has the best corrosion resistance.

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“…To protect Mg alloy against corrosion and to maintain their mechanical integrity, various kinds of anti-corrosion techniques have been developed, such as phosphating treatment, microarc oxidation and polymer coating [8][9][10][11][12]. Although these surface modifications are ways of preventing corrosion and maintaining the mechanical strength of Mg alloy to some extent [13], there are a lack of chemical bonding interfaces between Mg alloy substrate and the protective coating.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Treatment Induced Fluoride Conversion Coating without Pores for High Corrosion Resistance of Mg Alloy

Sheng¹,

Yi²,

Zhu³

et al. 2020

Coatings

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Fluoride conversion (MgF2) coating with facile preparation and good adhesion is promising to protect Mg alloy, but defects of pores in the coating lead to limited corrosion resistance. In this study, a compact and dense MgF2 coating was prepared by the combination of fluoride treatment and ultrasonic treatment. The ultrasonically treated MgF2 coating showed a compact and dense structure without pores at the frequency of 28 kHz. The chemical compositions of the coating were mainly composed of F and Mg elements. The corrosion potential of the ultrasonically treated Mg alloy shifted towards the noble direction in the electrochemical tests. The corrosion current density decreased due to the protectiveness of MgF2 coating without defects of pores or cracks. During immersion tests for 24 h, the ultrasonically treated Mg alloy exhibited the lowest H2 evolution (0.32 mL/cm2) and pH value (7.3), which confirmed the enhanced anti-corrosion ability of MgF2 coating. Hence, the ultrasonically treated fluoride coating had great potentials for their use in anti-corrosion applications of Mg alloy.

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Characterization of the corrosion performances of as‐cast Mg–Al and Mg–Zn magnesium alloys with microarc oxidation coatings

Cited by 17 publications

References 45 publications

[Retracted] Influence of Al Content on Degradation Behavior of Cu‐Doped Mg‐Al Alloys for Drill‐Free Plugging Applications

[Retracted] Influence of Al Content on Degradation Behavior of Cu‐Doped Mg‐Al Alloys for Drill‐Free Plugging Applications

Fabrication and properties of the superhydrophobic ceria‐based composite coating on magnesium alloy

Ultrasonic Treatment Induced Fluoride Conversion Coating without Pores for High Corrosion Resistance of Mg Alloy

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