Corrosion behavior and prevention strategies for magnesium (Mg) alloys

Song, Guang‐Ling

doi:10.1533/9780857098962.1.3

Cited by 43 publications

(59 citation statements)

References 108 publications

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“…15,[18][19][20] Conversion coatings are another effective method to improve the corrosion resistance of Mg alloys.…”

Section: 12mentioning

confidence: 99%

“…Many corrosion mitigation methods have been reported, including alloying, surface modification, coatings, and inhibitors. [13][14][15] Birbilis et al studied the effect of numerous alloying elements on the corrosion kinetics of Mg, graphically presenting the effect of anodic and cathodic kinetics on over 30 alloying elements. 16,17 These detailed studies of alloying elements provided beneficial information for the fabrication, modification and development of corrosion-resistant Mg alloys.…”

mentioning

confidence: 99%

“…Surface modification of Mg alloys includes anodizing, 18 hot diffusion, 19 laser treatment 20 and other treatments that affect the surface, but do not change the original mechanical properties of the alloy. 15 Surface modification can increase polarization resistance and reduce the localized galvanic interactions that arise from the heterogeneous structure found in these alloys. 15,[18][19][20] Conversion coatings are another effective method to improve the corrosion resistance of Mg alloys.…”

mentioning

confidence: 99%

“…15 Surface modification can increase polarization resistance and reduce the localized galvanic interactions that arise from the heterogeneous structure found in these alloys. 15,[18][19][20] Conversion coatings are another effective method to improve the corrosion resistance of Mg alloys. 21 These coatings can provide excellent protection of the substrate.…”

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confidence: 99%

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Corrosion Inhibition Study of Aqueous Vanadate on Mg Alloy AZ31

Feng

Hurley

et al. 2018

J. Electrochem. Soc.

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Corrosion inhibition of AZ31 Mg alloy with aqueous vanadate was studied and has been attributed to the pH dependence of vanadate speciation. Immersion in tetrahedral coordinated vanadate species, present in neutral and alkaline solution, was shown to decrease corrosion current density and increase the breakdown potential, both of which were enhanced with longer immersion times. Exposure to octahedral coordinated vanadate, predominant in acidic solution, only slightly decreased corrosion current density. An acidic solution was adjusted to alkaline conditions and samples were immersed in the adjusted alkaline solution. Inhibition of these samples was weaker than that of samples immersed in initially alkaline solutions. Anodic inhibition was observed on samples treated in solutions containing tetrahedral species. SEM images showed that vanadate formed a film across secondary particles and the Mg matrix, and provided qualitative evidence that inhibition efficiency increased as the pH increased. XPS results indicated that film formation was associated with the reductive adsorption of vanadium oxoions. Exposure at pH 5.0 produced a film predominated by V 4+ . Exposure at pH values of 7.7 and higher, however, produced a film containing predominantly V 3+ . Mg alloys have attracted great attention due to their high strength/weight ratio, good thermal conductivity and other physical properties.1-3 They have been widely used in the automotive industry, as aerospace components, and in the field of electronics.4-9 However, Mg alloys have high chemical activities, and are susceptible to corrosion, especially galvanic corrosion arising from interactions with more noble materials such as steel.10 Their active corrosion behavior is a barrier to wider applications. Therefore, protection under various application conditions is a critical issue strongly worthy of investigation. 11,12Extensive research has been conducted with the goal of inhibiting corrosion and improving the corrosion resistance of Mg alloys. Many corrosion mitigation methods have been reported, including alloying, surface modification, coatings, and inhibitors.13-15 Birbilis et al. studied the effect of numerous alloying elements on the corrosion kinetics of Mg, graphically presenting the effect of anodic and cathodic kinetics on over 30 alloying elements. 16,17 These detailed studies of alloying elements provided beneficial information for the fabrication, modification and development of corrosion-resistant Mg alloys. Surface modification of Mg alloys includes anodizing, 18 hot diffusion, 19 laser treatment 20 and other treatments that affect the surface, but do not change the original mechanical properties of the alloy.15 Surface modification can increase polarization resistance and reduce the localized galvanic interactions that arise from the heterogeneous structure found in these alloys. 15,[18][19][20] Conversion coatings are another effective method to improve the corrosion resistance of Mg alloys.21 These coatings can provide excellent protection of the s...

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“…15,[18][19][20] Conversion coatings are another effective method to improve the corrosion resistance of Mg alloys.…”

Section: 12mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Corrosion Inhibition Study of Aqueous Vanadate on Mg Alloy AZ31

Feng

Hurley

et al. 2018

J. Electrochem. Soc.

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“…One of the main challenges in the use of Mg alloys, particularly for outdoor applications, is its poor corrosion resistance [1,2]. There are two main methods to improve the corrosion resistance of Mg alloys.…”

Section: Introductionmentioning

confidence: 99%

Electrophoretic painting on AZ31 Mg alloy pretreated in cerium conversion coating solutions prepared in ethanol-water mixtures

2017

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Electrophoretic painting (E-paint) was prepared on AZ31 Mg alloy samples pretreated in cerium conversion coating (CeCC) solutions with various ratios of ethanol and water mixture and its characteristics, adhesion and corrosion resistance were investigated. It was found that CeCC formed on AZ31 Mg alloy in a CeCC solution without ethanol was partly cracked structure and mainly consisted of Mg(OH)2/MgO, which exhibited weak adhesion with E-painting layer after water immersion test, and low corrosion resistance, as indicated by rapid formation of blisters and paint delamination during salt spray test. The addition of ethanol promoted the growth of a fine nano-crystalline CeO2 layer over the entire substrate surface. The E-paint on AZ31 pretreated in the CeCC solutions with addition of ethanol showed also improved corrosion resistance, as represented by the delayed time for paint delamination and blister formation. The E-paint layers on the CeCC layers formed in solutions containing 50-80 vol% ethanol showed stronger adhesion and better corrosion resistance than those formed on the samples treated in a non-ethanol containing CeCC solution.

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Critical review on development of magnesium alloy as anode inMg‐Airfuel cell and additives in electrolyte

et al. 2021

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Summary This study aimed to provide a critical review of the magnesium‐air fuel cell (MAFC) system to provide readers with an overall comprehension of MAFC, which focuses on the modification of the magnesium anode and properties of saltwater as an electrolyte. Although MAFC is benign to the environment, it is well‐known for its challenging corrosion issue and by‐product deposition that affect its durability for commercialization and long‐term application. Since that MAFC is able to use seawater as electrolyte, it has great potential to be used as an alternative energy option for the marine sector. This journal will dissect the ability of MAFC to be used as a competitive alternative energy. Over the years, researchers have adopted several approaches, such as experimenting with different types of magnesium alloy and anode fabrication techniques, to tackle corrosion problems to alter the microstructure and mechanical properties of the anode in addition to applying a coating protection and using Mg‐based composite material. Furthermore, studies intriguingly and gradually focused on electrolyte formulation with different types of additives to address the debilitating precipitation issue and improve the discharge performance. Given the problems that arise in the system, currently, MAFC commercial products are only suitable as emergency back‐up power. In future work, an improved storage system for MAFC should be built to accommodate the precipitation products while maintaining the desired cell performance.

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Corrosion behavior and prevention strategies for magnesium (Mg) alloys

Cited by 43 publications

References 108 publications

Corrosion Inhibition Study of Aqueous Vanadate on Mg Alloy AZ31

Corrosion Inhibition Study of Aqueous Vanadate on Mg Alloy AZ31

Electrophoretic painting on AZ31 Mg alloy pretreated in cerium conversion coating solutions prepared in ethanol-water mixtures

Critical review on development of magnesium alloy as anode inMg‐Airfuel cell and additives in electrolyte

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