Microgalvanic Corrosion of Mg–Ca and Mg–Al–Ca Alloys in NaCl and Na2SO4 Solutions

Yang, Peixu; Ye, Songbo; Feng, Baojing; Liu, Jinhui; Huang, Sensen; Liu, Guonan; Zhang, Weidong; Tang, Wei; Zhu, Shijie; Zhang, Shaojun

doi:10.3390/ma14237140

Cited by 7 publications

(3 citation statements)

References 35 publications

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“…A 3% NaCl solution was used, and the specimens were completely immersed in the solution for 1 week (168 h). This is a widely used test used to assess corrosion performance in the absence of dedicated salt spray testing equipment, and similar methods are reported by several researchers [33][34][35]. The specimens were scratchmarked in an X shape, and the Mg alloy substrate was exposed to assess the direction of the corrosion and self-healing ability of the coating in the event of coating damage.…”

Section: Methodsmentioning

confidence: 94%

Combined PEO and Spray Pyrolysis Coatings of Phosphate and ZnO for Enhancing Corrosion Resistance in AZ31 Mg Alloy

Singh,

Drunka,

Iesalniece

et al. 2023

Surfaces

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Oxide films produced from plasma electrolytic oxidation are porous in structure. While they have some passivating effect in Mg alloys, the pores still lead to corrosion over long periods of exposure. In this study, spray pyrolysis was used to seal the porous oxide layer developed through the plasma electrolytic oxidation method on Mg alloy AZ31. The PEO coating acted as a good base for the application of spray pyrolysis due to its morphology. Three different kinds of coatings were obtained using different precursors: zinc acetate for ZnO, phosphoric acid for phosphate (P), and a mixture of zinc acetate and sodium phosphate for ZnO+P. The corrosion performance of all three coatings was studied by performing electrochemical impedance and polarization tests on the samples. Mass loss over a duration of 1 week was measured in 3% NaCl solution using immersion gravimetry. The coating with only phosphate (P) was found to be most corrosion-resistant with 52 times lower rate of corrosion and 50 times more polarization potential. The chemical composition of the corrosion products was studied using XRD and SEM-EDS analysis. Mass loss in ZnO+P was the highest, at up to 1.4 and 5.1 times higher than ZnO and P, respectively.

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Section: Methodsmentioning

confidence: 94%

Combined PEO and Spray Pyrolysis Coatings of Phosphate and ZnO for Enhancing Corrosion Resistance in AZ31 Mg Alloy

Singh,

Drunka,

Iesalniece

et al. 2023

Surfaces

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“…The NaCl solution is another important testing medium because it facilitates the degradation of Mg-based alloys, so mechanical properties and hydrogen emissions can be investigated based on an accelerated model. Yang et al [ 16 ] analyzed the micro galvanic corrosion of Mg–Ca and Mg–Al–Ca alloys in NaCl and Na 2 SO 4 solutions. It was reported that rapid corrosion of the secondary phases existent in the above-mentioned alloys occurred in the case of NaCl medium.…”

Section: Introductionmentioning

confidence: 99%

Effect of Fluoride Coatings on the Corrosion Behavior of Mg–Zn–Ca–Mn Alloys for Medical Application

Bita,

Antoniac,

Ciuca

et al. 2023

Materials

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The most critical shortcoming of magnesium alloys from the point of view of medical devices is the high corrosion rate, which is not well-correlated with clinical needs. It is well- known that rapid degradation occurs when an implant made of Mg-based alloys is placed inside the human body. Consequently, the implant loses its mechanical properties and failure can occur even if it is not completely degraded. The corrosion products that appear after Mg-based alloy degradation, such as H2 and OH− can have an essential role in decreasing biocompatibility due to the H2 accumulation process in the tissues near the implant. In order to control the degradation process of the Mg-based alloys, different coatings could be applied. The aim of the current paper is to evaluate the effect of fluoride coatings on the corrosion behavior of magnesium alloys from the system Mg–Zn–Ca–Mn potentially used for orthopedic trauma implants. The main functional properties required for the magnesium alloys to be used as implant materials, such as surface properties and corrosion behavior, were studied before and after surface modifications by fluoride conversion, with and without preliminary sandblasting, of two magnesium alloys from the system Mg–Zn–Ca–Mn. The experimental results showed that chemical conversion treatment with hydrofluoric acid is useful as a method of increasing corrosion resistance for the experimental magnesium alloys from the Mg–Zn–Ca–Mn system. Also, high surface free energy values obtained for the alloys treated with hydrofluoric acid correlated with wettability lead to the conclusion that there is an increased chance for biological factor adsorption and cell proliferation. Chemical conversion treatment with hydrofluoric acid is useful as a method of increasing corrosion resistance for the experimental Mg–Zn–Ca–Mn alloys.

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“…Magnesium (Mg) and Mg alloys have been attractive engineering materials for lightweight structural applications in the fields of aerospace, automotive, and electronics due to the combination of their high strength, low density, thermal conductivity, and electromagnetic shield ability [ 1 , 2 ]. At the same time, Mg alloys have been considered as a potential candidate for biodegradable cardiovascular and orthopedic implants due to their low density (1.7–2.0 g/cm 3 ), relatively high stiffness, good biocompatibility, and similar elastic modulus (41–45 GPa) as the human bone [ 3 , 4 , 5 , 6 ]. In addition, in the field of energy, magnesium alloys are used as anode materials for high-power seawater activated batteries [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Corrosion Performance of Extruded and Forged WE43 Mg Alloy

Liu

Feng

et al. 2022

Materials

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Adjusting the microstructure through the deformation process is one of the ways to improve the properties of Mg alloys. Most studies have focused on the influence of the microstructure after deformation treatment on the mechanical properties of Mg alloys. In this paper, extruded and forged Mg-Gd-Y-Nd-Zr alloys were selected to investigate the corrosion performance of two deformed magnesium alloys immersed in 0.6 M NaCl solution using a hydrogen evolution test, a weight loss test, an immersion experiment, and an electrochemical test. The results showed that WE43 alloys undergoing different deformation treatments presented different microstructures, which led to different corrosion behaviors and corrosion resistance. The extruded WE43 alloy showed uniform corrosion, while the forged WE43 alloy suffered severe local galvanic corrosion. Meanwhile, the corrosion rate of the forged WE43 alloy was about four times faster than that of the extruded WE43 alloy.

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Microgalvanic Corrosion of Mg–Ca and Mg–Al–Ca Alloys in NaCl and Na2SO4 Solutions

Cited by 7 publications

References 35 publications

Combined PEO and Spray Pyrolysis Coatings of Phosphate and ZnO for Enhancing Corrosion Resistance in AZ31 Mg Alloy

Combined PEO and Spray Pyrolysis Coatings of Phosphate and ZnO for Enhancing Corrosion Resistance in AZ31 Mg Alloy

Effect of Fluoride Coatings on the Corrosion Behavior of Mg–Zn–Ca–Mn Alloys for Medical Application

Comparison of Corrosion Performance of Extruded and Forged WE43 Mg Alloy

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