Corrosion behaviour of Mg–Cu and Mg–Mo composites in 3.5% NaCl

Abhijeet, S. Budruk; Balasubramaniam, R.; Gupta, Manoj

doi:10.1016/j.corsci.2008.06.043

Cited by 62 publications

(11 citation statements)

References 12 publications

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“…Cor reported that Cu could be a good corrosion accelerator in Mg‐Al alloys if it exceeded the tolerance limits (e.g., 300 pm recommended by ASTM specification B94). Similar results were also reported by other researchers …”

Section: Introductionsupporting

confidence: 93%

Accelerated degradation rate of AZ31 magnesium alloy by copper additions

Zhou

Liu

et al. 2018

Materials & Corrosion

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Corrosion property of AZ31‐xCu (x = 0, 0.5, 1.5, 3 wt%) alloys has been investigated using scanning electron microscope (SEM) equipped with energy dispersive spectroscope (EDS), X‐ray diffractometer (XRD), immersion tests, and electrochemical measurements. The results indicate that the content of AlCuMg phase, main secondary phase in the Cu‐containing alloys, is positively dependent on copper concentration. Acceleration of corrosion rate is found in Cu‐containing alloys due to micro‐galvanic corrosion. AlCuMg phase acts as micro‐galvanic cathode against anodic magnesium matrixes. In this regard, the degradation rate is decreasing in the following order: AZ31‐3Cu > AZ31‐1.5Cu > AZ31‐0.5Cu > AZ31.

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Section: Introductionsupporting

confidence: 93%

Accelerated degradation rate of AZ31 magnesium alloy by copper additions

Zhou

Liu

et al. 2018

Materials & Corrosion

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“…The most intuitive phenomenon is that the XRD pattern of the sintered specimen shows a copper (311) peak, and the corresponding 2θ is 89.245° [15]. tendency decreases.Abhijeet et al [16] proposed that when the reinforcement was more inert than the matrix material, the open circuit potential would move to a positive value. At the same temperature, the increase in Al 2 O 3 whisker content in figures 4(b) and (c) increases the corrosion tendency first and then decreases.Among them, the increase in corrosion tendency is due to the fact that whiskers can cause huge differences in performance in different directions, and are easy to agglomerate and entangle in the matrix, which can increase the heterogeneity of materials in copper matrix alloys.…”

Section: Methodsmentioning

confidence: 99%

Study on corrosion resistance of copper matrix composites reinforced by Al₂O₃ whiskers

Jiang

Xiao

et al. 2020

Mater. Res. Express

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The corrosion behavior of copper matrix composites with different Al 2 O 3 whisker content in NaCl solution (3.6 wt%) at different temperatures was studied by electrochemical test and electron microscope. The results showed that with the increase of Al 2 O 3 whisker content, the corrosion tendency of the composites first increases and then decreases. The charge-transfer resistance (Rct) value and corrosion current density tend to decrease first and then rise slowly. The whiskers can cause huge differences in performance in different directions so that it is easy to agglomerate and entangle in the matrix, which can increase the heterogeneity of materials in copper matrix alloys, hence, the addition of whiskers will cause the increase of corrosion phenomenon. As the whisker content continues to increase, a large number of reinforcing phases will form a natural protective layer when exposed on the metal surface, which will slow down the corrosion situation. As the temperature increases, the corrosion resistance decreases first and then increases. When the temperature increases from 25°C to 50°C, the electrochemical reaction is accelerated, the free electrons between the metal atoms obtain external energy, the ion migration rate is accelerated, and the corrosion reaction is more likely to occur. When the temperature increases from 50°C to 75°C, the corrosion reaction rate is mainly controlled by the diffusion of oxygen. As the temperature increases, the solubility of oxygen decreases and the cathode reaction requires oxygen to participate, consequently, the corrosion rate decreases. For the microstructure of the corrosion specimen, corrosion mainly occurred at or around the reinforcement phase/matrix interface. Intermetallic compound particles often appear near corrosion initiation points along the reinforcement phase/matrix interface, and the corrosion behavior of composites is mainly determined by copper. Copper is used as the anode of the battery, and the corrosion products are mainly copper chloride salts.

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“…In these composites, the interfaces of reinforcement and matrix are especially prone to be attacked by chloride ions, resulting in pitting and crevice corrosion [127]. The existence of SiC [128], Al 2 O 3 [129], Cu [130], and Mo [130] reinforcements can also increase the corrosion rate of Mg-based composites. For the MWCNT-reinforced MMNCs, depending on the process employed for fabricating the composite and nature of the matrix material, the corrosion rate may increase or decrease.…”

Section: Corrosion Propertiesmentioning

confidence: 99%

Carbon Nanotubes (CNTs)-Reinforced Magnesium-Based Matrix Composites: A Comprehensive Review

et al. 2020

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In recent years considerable attention has been attracted to magnesium because of its light weight, high specific strength, and ease of recycling. Because of the growing demand for lightweight materials in aerospace, medical and automotive industries, magnesium-based metal matrix nanocomposites (MMNCs) reinforced with ceramic nanometer-sized particles, graphene nanoplatelets (GNPs) or carbon nanotubes (CNTs) were developed. CNTs have excellent material characteristics like low density, high tensile strength, high ratio of surface-to-volume, and high thermal conductivity that makes them attractive to use as reinforcements to fabricate high-performance, and high-strength metal-matrix composites (MMCs). Reinforcing magnesium (Mg) using small amounts of CNTs can improve the mechanical and physical properties in the fabricated lightweight and high-performance nanocomposite. Nevertheless, the incorporation of CNTs into a Mg-based matrix faces some challenges, and a uniform distribution is dependent on the parameters of the fabricating process. The characteristics of a CNTs reinforced composite are related to the uniform distribution, weight percent, and length of the CNTs, as well as the interfacial bonding and alignment between CNTs reinforcement and the Mg-based matrix. In this review article, the recent findings in the fabricating methods, characterization of the composite’s properties, and application of Mg-based composites reinforced with CNTs are studied. These include the strategies of fabricating CNT-reinforced Mg-based composites, mechanical responses, and corrosion behaviors. The present review aims to investigate and conclude the most relevant studies conducted in the field of Mg/CNTs composites. Strategies to conquer complicated challenges are suggested and potential fields of Mg/CNTs composites as upcoming structural material regarding functional requirements in aerospace, medical and automotive industries are particularly presented.

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Corrosion behaviour of Mg–Cu and Mg–Mo composites in 3.5% NaCl

Cited by 62 publications

References 12 publications

Accelerated degradation rate of AZ31 magnesium alloy by copper additions

Accelerated degradation rate of AZ31 magnesium alloy by copper additions

Study on corrosion resistance of copper matrix composites reinforced by Al₂O₃ whiskers

Carbon Nanotubes (CNTs)-Reinforced Magnesium-Based Matrix Composites: A Comprehensive Review

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Corrosion behaviour of Mg–Cu and Mg–Mo composites in 3.5% NaCl

Cited by 62 publications

References 12 publications

Accelerated degradation rate of AZ31 magnesium alloy by copper additions

Accelerated degradation rate of AZ31 magnesium alloy by copper additions

Study on corrosion resistance of copper matrix composites reinforced by Al2O3 whiskers

Carbon Nanotubes (CNTs)-Reinforced Magnesium-Based Matrix Composites: A Comprehensive Review

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Study on corrosion resistance of copper matrix composites reinforced by Al₂O₃ whiskers