Effects of Al<sup>3+</sup> concentration in hydrothermal solution on the microstructural and corrosion resistance properties of fabricated MgO ceramic layer on AZ31 magnesium alloy

Zhi-hu, Wang; Zhang, Jumei; Bai, Liang; Zhang, Guojun

doi:10.1002/maco.202011948

Cited by 6 publications

(1 citation statement)

References 47 publications

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“…According to the recent study by Wang et al [ 91 ], Mg–Al–Zn LDH films were successfully deposited on the PEO-coated AZ31 Mg alloy through a hydrothermal treatment in a solution of 0.05 M of Zn(NO 3 ) 2 ·6H 2 O without and with 0.01 and 0.05 M Al(NO 3 ) 3 ·9H 2 O solution. The results revealed that the MgO which is the main component of PEO coating tended to dissolve partially under the hydrothermal treatment, liberating Mg 2+ ions, which combined with Al 3+ , Zn 2+ , and OH − ions, forming Mg–Al–Zn LDH films, which in turn act as a sealing agent to the porous morphology of PEO coating.…”

Section: Corrosion Performance Of Ldh/anodic Film Compositesmentioning

confidence: 99%

A Review on LDH-Smart Functionalization of Anodic Films of Mg Alloys

Kaseem

Ramachandraiah

Hossain³

et al. 2021

Nanomaterials

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This review presents an overview of the recent developments in the synthesis of layered double hydroxide (LDH) on the anodized films of Mg alloys prepared by either conventional anodizing or plasma electrolytic oxidation (PEO) and the applications of the formed composite ceramics as smart chloride traps in corrosive environments. In this work, the main fabrication approaches including co-precipitation, in situ hydrothermal, and an anion exchange reaction are outlined. The unique structure of LDH nanocontainers enables them to intercalate several corrosion inhibitors and release them when required under the action of corrosion-relevant triggers. The influences of different variables, such as type of cations, the concentration of salts, pH, and temperature, immersion time during the formation of LDH/anodic film composites, on the electrochemical response are also highlighted. The correlation between the dissolution rate of PEO coating and the growth rate of the LDH film was discussed. The challenges and future development strategies of LDH/anodic films are also highlighted in terms of industrial applications of these materials.

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Section: Corrosion Performance Of Ldh/anodic Film Compositesmentioning

confidence: 99%

A Review on LDH-Smart Functionalization of Anodic Films of Mg Alloys

Kaseem

Ramachandraiah

Hossain³

et al. 2021

Nanomaterials

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In situ growth process and corrosion resistance of a layered double‐hydroxide film on an LA103Z magnesium–lithium alloy

Zhang

Duan

Hou

et al. 2022

Materials & Corrosion

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A layered double‐hydroxide (Mg–Al LDH) film was grown in situ on an LA103Z magnesium alloy in an aluminum nitrate solution at 90°C by adjusting the hydrothermal reaction time. The Mg–Al LDH film comprised Mg–Al LDH and Mg(OH)2, which was obtained after hydrothermal treatment for 24 h, and was thick and dense, with a uniform and compact LDH sheet growing perpendicular to the surface. The LDH sheet showed the best corrosion resistance, and both the Rp and icorr values were two orders of magnitude higher than those of the LA103Z substrate. Nevertheless, the corrosion resistances of the LDH films obtained after treatment for 12 and 30 h were poor owing to the small film thickness and the loose film structure, respectively. Therefore, an appropriate extension of the hydrothermal reaction time can promote the nucleation and growth of LDH and improve the corrosion resistance of the film. When the hydrothermal reaction time exceeded 24 h, the LDH began to dissolve, and the corrosion resistance of the film decreased.

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A comparative study and optimization of corrosion resistance of Mg–Al layered double hydroxides films at different hydrothermal temperatures on LA103Z Mg–Li alloy

Zhang

Hou

et al. 2022

Materials & Corrosion

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In this study, to improve the corrosion protection system of Mg-Li alloy, Magnesia-alumina Layered double hydroxide (Mg-Al LDH) films were prepared on the LA103Z magnesium-lithium (Mg-Li) alloy by the in situ hydrothermal method. Subsequently, the microstructure of the Mg-Al LDH films was characterized by scanning electron microscope, X-ray spectrometer, X-ray diffraction, Fourier-transform infrared spectroscopy, and the effect of different hydrothermal temperatures on the growth of the film was studied.Electrochemical impedance spectroscopy (EIS) and hydrogen evolution test were used to study the corrosion behavior of the films, revealing the anticorrosion mechanism of the films. The results show that the LDH film is in the form of a sheet-like structure that crosses vertically on the LA103Z substrate. With the increase of the hydrothermal temperature, the size of the Mg-Al LDH sheet increases, and the distribution is denser. Electrochemical tests showed that the coated samples had significantly improved impedance modulus (|Z|) and charge transfer resistance (R t ) compared to bare samples. The potentiodynamic polarization curves demonstrated that the Mg-Al LDH film can effectively improve the corrosion resistance of the LA103Z magnesium alloy substrate.corrosion mechanism, corrosion resistance, in situ hydrothermal method, LDH film, Mg-Li alloy | INTRODUCTIONRecently, magnesium (Mg) and its alloys have attracted much attention due to their high specific strength, excellent electromagnetic shielding properties, good casting properties, vibration-damping properties, good biocompatibility, and easy recycling. [1][2][3] These properties have good application prospects in the automotive, aerospace, communication electronics, and biomedical fields. [4,5] However, due to their high electrochemical activity, particularly in environments and solutions containing Cl − , where they are vulnerable to the aggression of Cl − , magnesium alloys have poor corrosion resistance, which severely restricts their use and

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Effects of Al³⁺ concentration in hydrothermal solution on the microstructural and corrosion resistance properties of fabricated MgO ceramic layer on AZ31 magnesium alloy

Cited by 6 publications

References 47 publications

A Review on LDH-Smart Functionalization of Anodic Films of Mg Alloys

A Review on LDH-Smart Functionalization of Anodic Films of Mg Alloys

In situ growth process and corrosion resistance of a layered double‐hydroxide film on an LA103Z magnesium–lithium alloy

A comparative study and optimization of corrosion resistance of Mg–Al layered double hydroxides films at different hydrothermal temperatures on LA103Z Mg–Li alloy

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Effects of Al3+ concentration in hydrothermal solution on the microstructural and corrosion resistance properties of fabricated MgO ceramic layer on AZ31 magnesium alloy

Cited by 6 publications

References 47 publications

A Review on LDH-Smart Functionalization of Anodic Films of Mg Alloys

A Review on LDH-Smart Functionalization of Anodic Films of Mg Alloys

In situ growth process and corrosion resistance of a layered double‐hydroxide film on an LA103Z magnesium–lithium alloy

A comparative study and optimization of corrosion resistance of Mg–Al layered double hydroxides films at different hydrothermal temperatures on LA103Z Mg–Li alloy

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Effects of Al³⁺ concentration in hydrothermal solution on the microstructural and corrosion resistance properties of fabricated MgO ceramic layer on AZ31 magnesium alloy