Electrochemical behavior of a magnesium ZK60 alloy processed by high-pressure torsion

Torbati-Sarraf, Hamidreza; Torbati-Sarraf, Seyed Alireza; Poursaee, Amir; Langdon, Terence G.

doi:10.1016/j.corsci.2019.04.006

Cited by 54 publications

(15 citation statements)

References 92 publications

(174 reference statements)

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“…Fabricate ultrafine-grained materials using severe plastic deformation (SPD) such as equal channel angular pressing (ECAP), high pressure torsion (HPT) and groove pressing (GP) have proven their effectiveness to improve the homogeneity of the microstructure of Mg alloys as well as their corrosion resistance by dissolution of impurities and accelerating passivity of Mg-based alloys [15][16][17][18][19]. However, the existing literature on the impact of the microstructure and the deformation processing on the corrosion behaviour is often contradictory [18].…”

Section: Introductionmentioning

confidence: 99%

Impact of rare-earth elements on the corrosion performance of binary magnesium alloys

Azzeddine

Hanna

Dakhouche

et al. 2020

Journal of Alloys and Compounds

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The corrosion behaviour of Mg-0.3Ce, Mg-0.41Dy, Mg-0.63Gd, Mg-1.44Nd and Mg-1.43La (wt.%) alloys in 3.5 wt.% NaCl solution was investigated using electrochemical tests. The ascast microstructures of the Mg-RE alloys were characterized by the presence of second phases (MgxCe, Mg41Dy5, Mg12Gd, Mg12Nd, Mg41Nd5, Mg24Nd and Mg12La) with different volume fraction and distribution. Results show that the corrosion mechanism was altered from uniform to localized corrosion mechanism depending on the specific RE alloying elements.The corrosion resistance of the Mg-RE alloys is increasing in the following order: Mg-1.43La, Mg-1.44Nd, Mg-0.3Ce, Mg-0.63Gd and Mg-0.41Dy. Accordingly, the corrosion morphology in the best resistant Mg-0.41Dy alloy and the worst Mg-1.43La alloy were observed and compared after 2h and 24 h of immersion using SEM-EDS, XPS and XRD analysis. The formation of the Dy2O3 oxide prevents the Mg-0.41Dy alloy from pitting corrosion and lead to an excellent corrosion surface even after 24 h of immersion. Meanwhile, the presence of a high fraction of the Mg12La phase along the grains boundaries in the Mg-1.43La alloy causes severe pitting corrosion by acting as anodic phase.

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Section: Introductionmentioning

confidence: 99%

Impact of rare-earth elements on the corrosion performance of binary magnesium alloys

Azzeddine

Hanna

Dakhouche

et al. 2020

Journal of Alloys and Compounds

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“…However, the coarser grains are not completely covered by this passivation layer (Figure 4). These quasi-adherent layers then become the centre of corrosion due to their anodic nature [68]. This metal oxide layer, however, can easily break down when attacked by chloride ions, causing pitting corrosion [69].…”

Section: Discussionmentioning

confidence: 99%

Compositional Tailoring of Mg–2Zn–1Ca Alloy Using Manganese to Enhance Compression Response and In-Vitro Degradation

et al. 2022

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The present study investigates Mg–2Zn–1Ca/XMn alloys as biodegradable implants for orthopedic fracture fixation applications. The effect of the presence and progressive addition of manganese (X = 0.3, 0.5, and 0.7 wt.%) on the degradation, and post-corrosion compressive response were investigated. Results suggest that the addition of manganese at 0.5 wt.% improved the corrosion resistance of Mg–2Zn–1Ca alloys. The pH values stabilized for the 0.5Mn-containing alloy and displayed a lower corrosion rate when compared to other Mg–2Zn–1Ca/Mn alloys. Mg–2Zn–1Ca showed a progressive reduction in the compressive strength properties at the end of day 21 whereas Mg–2Zn–1Ca/0.3Mn and Mg–2Zn–1Ca/0.5Mn samples showed a decrease until day 14 and stabilized around the same strength range after day 21. The ability of Mg–2Zn–1Ca/0.5Mn alloy to develop a network of protective hydroxide and phosphate layers has resulted in the corrosion control of the alloy. Mg–2Zn–1Ca/0.7Mn displays segregation of Mn particles at the grain boundaries resulting in decreased corrosion protection. The mechanism behind the corrosion protection of Mg–2Zn–1Ca alloys was discussed.

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“…A higher corrosion rate was reported in a sample in which the grain size distribution was less homogeneous [ 55 ]. A deteriorated corrosion resistance was reported in a ZK60 magnesium alloy processed by a few turns of HPT and was also attributed to heterogeneous grain size distribution [ 93 ]. However, further processing of this alloy to a larger number of turns caused homogenization of the grain structure and improved the corrosion resistance [ 93 ].…”

Section: Corrosion Behaviormentioning

confidence: 99%

“…A deteriorated corrosion resistance was reported in a ZK60 magnesium alloy processed by a few turns of HPT and was also attributed to heterogeneous grain size distribution [ 93 ]. However, further processing of this alloy to a larger number of turns caused homogenization of the grain structure and improved the corrosion resistance [ 93 ]. A recent paper showed that localized corrosion can develop in areas in which deformation heterogeneity takes place during HPT processing.…”

Section: Corrosion Behaviormentioning

confidence: 99%

“… Corrosion rate reported in samples of magnesium processed via ECAP [ 52 , 55 , 56 , 57 , 58 , 59 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 69 , 71 , 73 , 74 , 75 , 76 , 77 , 78 , 79 , 80 , 82 , 83 , 84 , 85 , 86 , 87 ] and HPT [ 19 , 88 , 90 , 91 , 92 , 93 , 94 , 95 , 97 , 98 , 99 , 100 ] plotted as a function of the grain size. …”

Section: Figurementioning

confidence: 99%

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An Overview on the Effect of Severe Plastic Deformation on the Performance of Magnesium for Biomedical Applications

et al. 2023

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There has been a great interest in evaluating the potential of severe plastic deformation (SPD) to improve the performance of magnesium for biological applications. However, different properties and trends, including some contradictions, have been reported. The present study critically reviews the structural features, mechanical properties, corrosion behavior and biological response of magnesium and its alloys processed by SPD, with an emphasis on equal-channel angular pressing (ECAP) and high-pressure torsion (HPT). The unique mechanism of grain refinement in magnesium processed via ECAP causes a large scatter in the final structure, and these microstructural differences can affect the properties and produce difficulties in establishing trends. However, the recent advances in ECAP processing and the increased availability of data from samples produced via HPT clarify that grain refinement can indeed improve the mechanical properties and corrosion resistance without compromising the biological response. It is shown that processing via SPD has great potential for improving the performance of magnesium for biological applications.

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Electrochemical behavior of a magnesium ZK60 alloy processed by high-pressure torsion

Cited by 54 publications

References 92 publications

Impact of rare-earth elements on the corrosion performance of binary magnesium alloys

Impact of rare-earth elements on the corrosion performance of binary magnesium alloys

Compositional Tailoring of Mg–2Zn–1Ca Alloy Using Manganese to Enhance Compression Response and In-Vitro Degradation

An Overview on the Effect of Severe Plastic Deformation on the Performance of Magnesium for Biomedical Applications

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