The effect of testing conditions on stress corrosion cracking of biodegradable magnesium alloy ZK60

Merson, Evgeniy; Poluyanov, Vitaliy; Myagkikh, Pavel; Мерсон, Д. Л.; Vinogradov, Alexei

doi:10.22226/2410-3535-2022-3-177-183

Cited by 3 publications

(9 citation statements)

References 21 publications

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“…This was explained primarily by a more resistant corrosion products layer. Merson et al examined another popular Mg-Zn-Zr alloy, ZK60, in two similar solutions [ 163 ]. It was found that the difference in the corrosion rate between the two solutions was not very large.…”

Section: Corrosion Properties: Modern Insights and Challengesmentioning

confidence: 99%

“…The pH level can be maintained in different ways. The partial replacement of the medium was used in [ 144 , 163 ]: when a certain pH level was reached, the solution was evacuated from the cell, and the fresh solution was supplied. The procedure was fully automated through the use of a digital pH meter, an electronic controller, and a dual-head peristaltic pump.…”

Section: Corrosion Properties: Modern Insights and Challengesmentioning

confidence: 99%

“…Mg alloys are known to be extremely prone to SCC in various corrosive environments, including distilled water [ 202 , 203 , 204 ], saline solutions [ 205 , 206 ], and all simulated body fluids (SBF) [ 163 , 202 ] commonly used for the examination of the corrosion properties of biomedical Mg alloys. The susceptibility of the alloys to SCC can be characterized by a number of characteristics, including the ultimate tensile stress and elongation to failure in a corrosive medium, the threshold stress (σ SCC ) and threshold stress intensity factor (K 1SCC ), below which SCC does not occur, as well as by a few variations in the SCC susceptibility indexes (I SCC ), which are equal to the loss of the ductility or strength (or both) of an alloy in a corrosive environment with respect to the alloy tested in air.…”

Section: Environmentally Affected Mechanical Responsementioning

confidence: 99%

“…For example, it follows from Figure 8 a,b that the alloy ZX50 exhibiting quite severe strength loss still possesses superior strength in the corrosive solution among all considered alloys. Besides ZX50, the alloys ZK60, AZ31, ZX10, WE43, Mg-Zn-Zr-0.4-0.8Sr (wt.%), and Mg-1Zn have a strength above 200 MPa when SSRT-tested in a corrosion solution [ 163 , 202 , 207 , 208 , 211 , 212 , 213 ]. Among these alloys, the relatively high ductility corresponds to AZ31, ZX10, Mg-4Zn-1Zr-0.4-0.8Sr, and Mg-1Zn.…”

Section: Environmentally Affected Mechanical Responsementioning

confidence: 99%

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Attaining High Functional Performance in Biodegradable Mg-Alloys: An Overview of Challenges and Prospects for the Mg-Zn-Ca System

et al. 2023

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This article presents a concise overview of modern achievements and existing knowledge gaps in the area of biodegradable magnesium alloys. Hundreds of Mg-based alloys have been proposed as candidates for temporary implants, and this number tends to increase day by day. Therefore, while reviewing common aspects of research in this field, we confine ourselves primarily to the popular Mg-Zn-Ca system, taken as a representative example. Over the last decades, research activities in this area have grown enormously and have produced many exciting results. Aiming at highlighting the areas where research efforts are still scarce, we review the state-of-the-art processing techniques and summarize the functional properties attained via a wide variety of processing routes devised towards achieving a desired properties profile, including the mechanical response in terms of strength, ductility, and fatigue resistance paired with biocompatibility and bio-corrosion resistance or controlled degradability. We pay keen attention to a summary of corrosion properties and mechano-chemical interactions between an aggressive environment and loaded Mg-based structures, resulting in stress corrosion cracking and premature corrosion fatigue failures. The polemic issues and challenges practitioners face in their laboratory research are identified and discussed.

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Section: Corrosion Properties: Modern Insights and Challengesmentioning

confidence: 99%

Section: Corrosion Properties: Modern Insights and Challengesmentioning

confidence: 99%

Section: Environmentally Affected Mechanical Responsementioning

confidence: 99%

Section: Environmentally Affected Mechanical Responsementioning

confidence: 99%

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Attaining High Functional Performance in Biodegradable Mg-Alloys: An Overview of Challenges and Prospects for the Mg-Zn-Ca System

et al. 2023

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“…Therefore, it will not be enough to improve the corrosion resistance of magnesium alloys only. [ 11–13 ] It has been stated in the literature that when the stress corrosion crack reaches critical dimensions, the samples may suffer unexpected damage even under a tensile strength of 30%. In several studies in the literature, the effects of different Mg alloys coated with the PEO method on SCC were investigated, and it was stated that the samples coated with the PEO method slightly improved the stress corrosion resistance of the Mg alloys.…”

Section: Introductionmentioning

confidence: 99%

Improvement of corrosion and stress corrosion properties of magnesium alloys by coating aluminum with the electric arc spray method

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Altun

2022

Materials & Corrosion

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In this study, corrosion and stress corrosion behaviors of AZ31, AZ61, and AZ91 magnesium alloys coated with aluminum by the electric arc spray method were investigated in 3.5 wt.% NaCl solution. Structural properties of coated materials were investigated by scanning electron microscopy (SEM), energy dispersive X‐ray analysis, and X‐ray diffraction. Electrochemical properties were determined using the potentiodynamic polarization method in 3.5 wt.% NaCl solution. Potentiodynamic polarization curves showed that corrosion current density values did not change with coating in aluminum‐coated samples by the electric arc spray method. In contrast, corrosion potential value increased toward positive values. Slow strain rate test (SSRT) was used to determine the stress corrosion behavior and stress corrosion indexes (ISCC), ultimate tensile strength (UTS), and elongation of AZ31, AZ61, and AZ91 magnesium (Mg) alloys were determined. As a result of the SSRT, the aluminum coating process decreased significantly the stress corrosion indexes of AZ31, AZ61, and AZ91 Mg alloys. The fracture of surface images was also examined in the SEM, and both intergranular and transgranular stress corrosion cracking were observed in all three alloys.

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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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The effect of testing conditions on stress corrosion cracking of biodegradable magnesium alloy ZK60

Cited by 3 publications

References 21 publications

Attaining High Functional Performance in Biodegradable Mg-Alloys: An Overview of Challenges and Prospects for the Mg-Zn-Ca System

Attaining High Functional Performance in Biodegradable Mg-Alloys: An Overview of Challenges and Prospects for the Mg-Zn-Ca System

Improvement of corrosion and stress corrosion properties of magnesium alloys by coating aluminum with the electric arc spray method

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

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