The corrosion behavior of AZ31 alloy in chloride and sulfate media – A comparative study through electrochemical investigations

Acharya, M. Gururaj; Shetty, A. Nityananda

doi:10.1016/j.jma.2018.09.003

Cited by 60 publications

(23 citation statements)

References 33 publications

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“…Yao 100 further supported the finding mentioning that magnesium alloys possess a high surface hydrophilic characteristic with a contact angle of less than 90°, allowing the corrosive Cl ions to spread over the alloy surface to accelerate corrosion and eventually corrode the substrate. Furthermore, the activation energy barrier during the corrosion reaction decreases when the salt concentration increases, implying that corrosion is thermodynamically favored in the concentrated media and thus confirming that the corrosion kinetics follow the Arrhenius law 115 . Widodo 117 added that it can be related to the conductivity of the solution, where a high conductivity of NaCl effectively increased the concentration of chloride ions, which in turn provided less resistivity for ion propagation in the solution that leads to the increased rate of oxidation of the metal.…”

Section: Physical Properties Of Nacl As Mafc Electrolyte Influencing Corrosion Behaviorsupporting

confidence: 53%

“…Merino 112 believed that increasing the concentration of chloride ion accelerates the detachment of the partially protective layer by disintegrating the deposited product formed from precipitation reaction, thereby promoting an anodic dissolution. Acharya and Shetty 115 highlighted that the presence of high concentrations of chloride ion in the corrosion medium destabilizes the surface Mg(OH) 2 film by dissolution and thus rejects the partial protection offered by the surface film of the corrosion product. In accordance with the property of chloride ions, Cao 116 explained that the aggressive behavior of chloride ions to metals is attributed to the small radius and high electronegativity, hence enabling these molecules to break through and subsequently tear down the corrosion product film.…”

Section: Physical Properties Of Nacl As Mafc Electrolyte Influencing Corrosion Behaviormentioning

confidence: 99%

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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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Section: Physical Properties Of Nacl As Mafc Electrolyte Influencing Corrosion Behaviorsupporting

confidence: 53%

Section: Physical Properties Of Nacl As Mafc Electrolyte Influencing Corrosion Behaviormentioning

confidence: 99%

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

et al. 2021

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“…However, the oxide film is porous and has a partial protective structure due to the occurrence of breaks and unprotected nature of the film. 49,50 It was observed that the layers have different surface roughness at higher magnification (Figure 10(c) and (d)). It is known that Cl À ions of saline solution enter through the formed cracks and imperfections in the oxide layer and corrode the material surface due to difficult oxygen transfer under the layer.…”

Section: Resultsmentioning

confidence: 94%

“…It is known that Cl À ions of saline solution enter through the formed cracks and imperfections in the oxide layer and corrode the material surface due to difficult oxygen transfer under the layer. 41,49,51 The beginning of the destructive of the oxide layer is shown in Figure 10(e) and (f).…”

Section: Resultsmentioning

confidence: 99%

The effect of graphene nano-sheet (GNS) weight percentage on mechanical and corrosion properties of AZ61 and AZ91 based magnesium matrix composites

Güler

Say

Dikici

2020

Journal of Composite Materials

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In this study, the effect of graphene nano-sheets (GNSs) on mechanical and corrosion properties of AZ61 and AZ91 based composites was investigated, detail. GNSs have been successfully produced by the liquid phase exfoliation (LPE) method and then, added AZ61 and AZ91 matrix with 01, 0.2, and 0.5 wt% GNSs for the production of the composites. The composite compacts were produced by powder metallurgy technique and sintered for 2 h at 500 °C under Ar atmosphere. The composite characterizations were carried out by scanning and transmission electron microscopes (SEM, TEM), electron dispersive spectroscope (EDS), Raman spectroscopy, and X-ray diffraction. The mechanical properties and corrosion behaviors of the composites have been compared with compression tests and potentiodynamic scanning (PDS) techniques, respectively. The results showed that the compressive strength of the composites increased with increasing GNS amount in both the AZ61 and AZ91 matrix alloys. The most susceptible composites to corrosion for both AZ61 and AZ91 matrix were observed in the 0.5 wt% GNS containing structures. However, there is a certain ratio of GNS in the Mg matrix to achieve good corrosion resistance.

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“…In recent years, there has been extensive research on Mg alloys [8,9,10,11,12,13,14,15], especially in wrought Mg alloys [16,17,18,19,20,21]. However, almost no Mg alloys are utilized in the automobile industry other than high pressure die casting (HPDC) Mg alloys.…”

Section: Introductionmentioning

confidence: 99%

Corrosion and Residual Strength Analysis of High Pressure Die Casting AM Series Mg Alloys

Zheng

Meng

et al. 2019

Materials

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Higher pressure die casting (HPDC) AM series (Mg-Al-Mn) Mg alloys have wide application potential in the automobile industry. To promote its application, systematic investigation on the corrosion performance and corrosion residual strength of HPDC AM50+1Ce and AM60 was carried out. The corrosion of HPDC AM50+1Ce was more uniform, while the pitting corrosion of AM60 was more severe, and the mechanical properties of HPDC AM60 was more sensitive to corrosion. The residual strength of AM50+1Ce and AM60 after corrosion of 648 h was 199 MPa and 183 MPa, respectively. The findings can contribute to a better understanding of the corrosion and residual strength of HPDC AM series Mg alloys.

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The corrosion behavior of AZ31 alloy in chloride and sulfate media – A comparative study through electrochemical investigations

Cited by 60 publications

References 33 publications

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

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

The effect of graphene nano-sheet (GNS) weight percentage on mechanical and corrosion properties of AZ61 and AZ91 based magnesium matrix composites

Corrosion and Residual Strength Analysis of High Pressure Die Casting AM Series Mg Alloys

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