Effect of Microstructure Refinement on the Corrosion Behavior of the Bioresorbable Mg-1Zn-0.2Ca and Mg-1Ca Alloys

Kulyasova, Olya B.; Khudododova, Ganjina D.; D’yakonov, G. S.; Zheng, Yufeng; Valiev, Ruslan Z.

doi:10.3390/ma15196749

Cited by 6 publications

(3 citation statements)

References 36 publications

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“…The positive effect of grain refinement on the corrosion resistance of Mg alloys has already been reported in the literature [ 30 , 31 , 32 ] and related to more uniform distribution of surface defects such as dislocations and grain boundaries. In the case of the Mg-Sr system, an additional factor to increase the corrosion resistance in the deformed states can be attributed to the fragmentation and partial dissolution of the second phases due to SPD, which is consistent with the findings reported in [ 18 ].…”

Section: Resultsmentioning

confidence: 83%

Microstructural Assessment, Mechanical and Corrosion Properties of a Mg-Sr Alloy Processed by Combined Severe Plastic Deformation

et al. 2023

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The development of high-performance biodegradable alloys with controllable corrosion rates to be used for manufacturing advanced implants is a hot topic of modern materials science and biomedicine. This work features the changes in microstructure, corrosion behavior and mechanical properties of the Mg-2 wt.%Sr alloy progressively induced by equal-channel angular pressing, high-pressure torsion and annealing. We show that such processing leads to significant microstructure refinement including diminishing grain size, defect accumulation and fragmentation of the initial eutectics. We demonstrate that the application of severe plastic deformation and heat treatment is capable of considerably enhancing the mechanical and corrosion performance of a biodegradable alloy of the Mg-Sr system. The best trade-off between strength, plasticity and the corrosion resistance has been achieved by annealing of the Mg-Sr alloy subjected to combined severe plastic deformation processing.

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Section: Resultsmentioning

confidence: 83%

Microstructural Assessment, Mechanical and Corrosion Properties of a Mg-Sr Alloy Processed by Combined Severe Plastic Deformation

et al. 2023

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“…It was concluded that HPT encourages the formation of special structures in Mg-1Zn-0.2Ca and Mg-1Ca alloys, thus decreasing the potential difference between the anode ( Mg 2 Ca) and the cathode ( α − Mg) by controlling the dispersion of eutectics region and avoiding the dissolution of large regions of the anode that cause surface pitting and corrosion propagation. Post-HPT annealing resulted in a conversion of [49].…”

Section: Magnesium and Magnesium Based Alloysmentioning

confidence: 99%

Influence of Metal Processing on Microstructure and Properties: Implications for Biodegradable Metals—A Mini Review

Jaraba,

Mahapatro

2023

Metals

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Biodegradable metallic alloys are currently being explored extensively for use in temporary implant applications, since the prolonged existence of implants within the body has been linked with health complications and metal toxicity. There are many metal alloy fabrication methods available in the industrial, aerospace, and biomedical fields; some of them have more advanced techniques and specialized equipment than others. Past studies have shown that the performances of materials is greatly affected by the concentration of alloying elements and the metal processing techniques used. However, the impact each fabrication method has on the chemical and mechanical properties of the material is not fully understood; this lack of knowledge limits the advancement of the field of biodegradable metals. This review provides a general introduction to biodegradable metals and their applications and then aims to give a broad overview of the influence of metal processing on the microstructure and properties of metal alloys. The possible implications of these fabrication methods for the biodegradable metals are discussed.

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“…The design of the microstructure through alloying, heat treatment, and thermomechanical processing, on the one hand, and the protection of the surface using coatings and surface modification techniques, on the other, represent the two main approaches for enhancing the corrosion performance of biomedical Mg alloys. The optimization of the alloying content aims at controlling the number and composition of secondary phase particles or reducing the electrode potential difference between them and the Mg matrix [9][10][11][12][13][14][15] as well as selection of the optimal parameters of the heat treatments and thermomechanical processes, including extrusion, hot-rolling, equal channel angular pressing, and other severe plastic deformation techniques [16][17][18][19][20][21][22][23]. Various methods for protecting the Mg surface from corrosion, including conversion [24][25][26] and organic coatings [27,28], anodizing and plasma electrolytic oxidation [29,30], surface heat treatment, and plastic deformation [9,31,32], have been proposed so far.…”

Section: Introductionmentioning

confidence: 99%

Improving Corrosion and Stress Corrosion Cracking Performance of Machined Biodegradable Alloy ZX20 by HF-Treatment

Merson,

Poluyanov,

Myagkikh

et al. 2023

Metals

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The treatment with hydrofluoric acid (HF-treatment) was suggested to be an effective way of improving the corrosion resistance of Mg alloys, including Mg-Zn-Ca (ZX) ones used for biodegradable implants. However, the effect of the HF-treatment on the stress corrosion cracking (SCC) susceptibility of ZX alloys has not been reported yet, although this phenomenon can induce premature brittle failures of the metallic medical devices, and thus, it is critical for their in-service structural integrity. In the present study, the effect of the HF-treatment on the microstructure, cytotoxicity, corrosion rate, mechanical properties, and fracture and side surface characteristics of the as-cast ZX20 alloy were investigated with the use of scanning electron microscopy, immersion, and slow-strain rate tensile testing in Hanks’ solution and indirect cell viability tests. It is found that the HF-treatment exerts no cytotoxic effect and results in a significant reduction in corrosion rate (up to 6 times of magnitude) and SCC susceptibility indexes (up to 1.5 times of magnitude). The observed improvement of corrosion and SCC performance of the alloy by the HF-treatment is found to be attributed to three effects, including (i) formation of the protective surface film of MgF2, (ii) removal of surficial contaminations originating from sample preparation procedures, and (iii) dissolution of surficial secondary phase particles. The mechanism of corrosion and SCC in the specimens before and after the HF-treatment are discussed.

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Effect of Microstructure Refinement on the Corrosion Behavior of the Bioresorbable Mg-1Zn-0.2Ca and Mg-1Ca Alloys

Cited by 6 publications

References 36 publications

Microstructural Assessment, Mechanical and Corrosion Properties of a Mg-Sr Alloy Processed by Combined Severe Plastic Deformation

Microstructural Assessment, Mechanical and Corrosion Properties of a Mg-Sr Alloy Processed by Combined Severe Plastic Deformation

Influence of Metal Processing on Microstructure and Properties: Implications for Biodegradable Metals—A Mini Review

Improving Corrosion and Stress Corrosion Cracking Performance of Machined Biodegradable Alloy ZX20 by HF-Treatment

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