De-alloying Behavior of Mg–Al alloy in Sulphuric Acid and Acetic Acid Aqueous Solutions

Li, Yonggang; Wei, Yinghui; Yang, Shengqiang

doi:10.3390/ma12132046

Cited by 7 publications

(4 citation statements)

References 47 publications

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“…When an electrochemical reaction between magnesium alloys and water occurs, the Mg matrix dissolves during the corrosion process, and a layer of hydroxide film is formed on the surface, accompanied by the generation of hydrogen gas [14]. The process of general corrosion is uniform and normally occurs on the surface of the material.…”

Section: General Corrosionmentioning

confidence: 99%

Corrosion and Protection of Magnesium Alloys: Recent Advances and Future Perspectives

Wu,

Zhang

2023

Coatings

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Magnesium alloys are of significant importance for lightweight manufacturing and weight-saving applications due to their high weight-to-strength ratio and good mechanical properties. However, the poor corrosion resistance of Mg alloys limits their large-scale practical application. An essential theoretical foundation for the development of corrosion-resistant magnesium alloys and their surface protection technologies can be elucidated via the investigation of the corrosion mechanism of the magnesium surface and the alteration of the corrosion rate after surface conversion and coating. This paper discusses some typical corrosion behaviors by originally describing the corrosion mechanism of magnesium alloys with and without different coatings and surface treatments. In order to predict the future theoretical investigation and research directions for the surface protection of magnesium alloys, some techniques and preventative measures to enhance the corrosion resistance of magnesium alloys are reviewed, and these protection techniques are intercompared for better understanding.

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Section: General Corrosionmentioning

confidence: 99%

Corrosion and Protection of Magnesium Alloys: Recent Advances and Future Perspectives

Wu,

Zhang

2023

Coatings

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“…The hydrogenation rate of the crystalline Mg was much higher than for the small amount of Li present in the disordered solid solution, and hence peaks originating from the β-Li(Mg) phase appeared due to Mg dealloying. The susceptibility of Mg alloys to selective corrosion is a well-known phenomenon [39], hence the possibility of local Mg loss during hydrogenation, which caused the chemical composition to shift towards the eutectic composition.…”

Section: Phase Structure and Hydrogenation Properties Of The Alloys Wmentioning

confidence: 99%

Hydrogenation Ability of Mg-Li Alloys

2020

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The Mg-Li binary system is characterized by the presence of α-Mg(Li) and β-Li(Mg) phases, where magnesium exists in ordered and disordered forms that may affect the hydrogenation properties of magnesium. Therefore, the hydrogenation properties of an AZ31 alloy modified by the addition of 4.0 wt.%, 7.5 wt.% and 15.0 wt.% lithium were studied. The morphology (scanning electron microscopy (SEM)), structure, phase composition (X-ray diffraction (XRD)) and hydrogenation properties (differential scanning calorimetry (DSC)) of AZ31 with various lithium contents were investigated. It was found that the susceptibility of magnesium in the form of α-Mg(Li) to hydrogenation was higher than that for the magnesium occupying a disordered position in β-Li(Mg) solid solutions. Magnesium hydride was obtained as a result of hydrogenation of the AZ31 alloy that was modified with 4.0 wt.%, 7.5 wt.% and 15.0 wt.% additions of lithium, and was characterized by high hydrogen desorption activation energies of 250, 187 and 224 kJ/mol, respectively.

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“…On the other hand, the morphology and distribution of the β phase can modulate the corrosion propagation because it can act as a corrosion barrier [6,15,16]. In a microstructure where the β phase forms a network structure, corrosion is slowed down thanks to its barrier effect, whereas the corrosion is accelerated by coarse and isolated β phase in the α-Mg matrix [17,18]. Lastly, grain size affects the corrosion properties.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behaviour of High-Pressure Die-Cast AZ91 Alloy in NaCl Solution: Effects of Friction Stir Process at High Rotational Speed

Ghio,

Cerri

2023

Materials

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The AZ series of Mg alloys have become promising in several industrial fields thanks to its potential microstructure refinement and the β-Mg17Al12 eutectic that controls the mechanical behaviour. Simultaneously, the rapid degradation characterizing Mg alloys makes the investigation of their corrosion behaviour necessary. The present work considers high-pressure die cast (HPDC) AZ91 alloy to evaluate its corrosion behaviour in 1M NaCl solution and investigates how different friction stir process parameters can affect the corrosion responses. No studies analyse the effects induced by the friction stir processed zone, reached using high rotational speeds (>2000 rpm), on the unprocessed HPDC AZ91 alloy. In addition, the morphological analysis of the corroded surfaces having a friction stir processed zone, in which the grain refinement was not obtained, is not present in the literature yet. Microstructural features were investigated by optical microscope and X-ray diffraction analysis before and after the friction stir process. These were subsequently correlated to the corrosion responses after the immersion tests. The results show that HPDC samples with a very smooth surface have the best corrosion resistance with a corrosion rate lower than 3 mm/year, evaluated through the weight loss, compared to the rougher ones. Both the amount of β-Mg17Al12 eutectic and the wt.% Al in the α-Mg matrix, as well as the surface roughness, influence the corrosion behaviour of friction stir processed samples. The best corrosion resistance was obtained with an HPDC alloy processed at 2500 rpm and 50 mm/min.

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De-alloying Behavior of Mg–Al alloy in Sulphuric Acid and Acetic Acid Aqueous Solutions

Cited by 7 publications

References 47 publications

Corrosion and Protection of Magnesium Alloys: Recent Advances and Future Perspectives

Corrosion and Protection of Magnesium Alloys: Recent Advances and Future Perspectives

Hydrogenation Ability of Mg-Li Alloys

Corrosion Behaviour of High-Pressure Die-Cast AZ91 Alloy in NaCl Solution: Effects of Friction Stir Process at High Rotational Speed

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