Influence of Intermetallic Particles on the Corrosion Properties of Extruded ZK60 Mg Alloy Containing Cu

Baek, Soo-Min; Kim, Peter Beomcheol

doi:10.3390/met8050323

Cited by 10 publications

(4 citation statements)

References 31 publications

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“…However, the effect of the second phase in ZK60 alloys on their corrosion behaviors is barely reported. Some researchers tried to enhance the corrosion resistance of ZK60 alloys by modifying their microstructure through heat treatment [ 30 , 31 ], deformation processing [ 32 ], and alloying [ 33 , 34 , 35 , 36 ]. Even so, the relationship between the microstructure and corrosion behavior of ZK60 alloys needs more studies for it to be investigated.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Corrosion of Cast Magnesium Alloy ZK60 in NaCl Solution

Peng

et al. 2020

Materials

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In this work, the effects of the microstructure and phase constitution of cast magnesium alloy ZK60 (Mg-5.8Zn-0.57Zr, element concentration in wt.%) on the corrosion behavior in aqueous NaCl (0.1 mol dm−3) were investigated by weight-loss measurements, hydrogen evolution tests, and electrochemical techniques. The alloy was found to be composed of α-Mg matrix, with large second-phase particles of MgZn2 deposited along grain boundaries and a Zr-rich region in the central area of the grains. The large second-phase particles and the Zr-rich regions were more stable than the Mg matrix, resulting in a strong micro-galvanic effect. A filiform corrosion was found. It originated from the second-phase particles in the grain boundary regions in the early corrosion period. The filaments gradually occupied most areas of the alloy surface, and the general corrosion rate decreased significantly. Corrosion pits were developed under filaments. The pit growth rate decreased over time; however, it was about eight times larger than the general corrosion rate. A schematic model is presented to illustrate the corrosion mechanism.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Corrosion of Cast Magnesium Alloy ZK60 in NaCl Solution

Peng

et al. 2020

Materials

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“…Additionally, due to the high intrinsic reactivity of Mg, the potential difference between the second phases and α-Mg matrix will cause galvanic corrosion. These second phases formed in ZWCK6100 alloy with combined addition of Cu and Y, such as CuMgZn and I (Mg 3 Zn 6 Y) phases, are nobler than α-Mg matrix [16] and will act as cathodes and accelerate the corrosion rate. The volume fraction of CuMnZn phase is very low, because the addition amount of Cu is 0.5 wt-%, combustion loss is inevitable in the smelting process, and some Cu atoms replace Mg atoms in I phase [25].…”

Section: Discussionmentioning

confidence: 99%

“…Numerous studies have suggested that Cu is one of the most important alloying elements for Mg alloys. On the one hand, Cu can improve the age hardening ability of Mg–Zn-based alloy by promoting the precipitation of MgZn 2 phases, and the mechanical properties of Mg–Zn, Mg–Zn–Al and Mg–Zn–Zr alloys have been significantly elevated by Cu addition [9,16-18]. On the other hand, the eutectic temperature of Mg–Zn alloys can be enhanced by Cu, permitting the use of a higher solution treatment temperature [19].…”

Section: Introductionmentioning

confidence: 99%

The corrosion behaviour of a novel Mg–Zn–Zr–Y–Cu alloy

Jia

Wang

Luo

2023

Materials Science and Technology

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A novel Mg–Zn–Zr–Y–Cu alloy was fabricated, and its corrosion behaviour was investigated in the present work. The results showed that, compared with Mg–6Zn–0.5Zr (ZK60) alloy, Mg–6Zn–1Y–0.5Cu–0.5Zr (ZWCK6100) alloy exhibited finer recrystallised (DRXed) and unDRXed grains, more homogeneous microstructure, and contained CuMgZn and I phase (Mg3Zn6Y) in addition to α-Mg, Zn2Zr, MgZn2 precipitates. As a result, ZWCK6100 alloy had a lower corrosion rate and higher corrosion resistance, underwent slightly localised corrosion in 3.5 wt-% NaCl solution, implying that the combined addition of Y and Cu was conducive to improving the corrosion resistance of Mg alloys.

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“…A strong micro-galvanic effect was observed between the Mg-α and MgZn 2 second-phase particles precipitated at grain boundaries. Baek et al [9] have also observed that intermetallic particles played a major role in the corrosion behavior of the ZK60 alloy in sodium chloride solution due to microgalvanic effects between the anodic Mg-α matrix and precipitates containing zinc and zirconium.…”

Section: Introductionmentioning

confidence: 97%

Effect of Graphene Oxide as an Anodizing Additive for the ZK60A Magnesium Alloy: Correlating Corrosion Resistance, Surface Chemistry and Film Morphology

Braga,

de Souza,

de Oliveira

et al. 2024

Metals

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The aim of the present work was to study the effect of graphene oxide as an additive in the anodization bath of the ZK60A magnesium alloy on the corrosion resistance, film morphology and surface chemical composition. The anodizing process was conducted at a constant current density of 30 mA.cm−2 in an electrolyte consisting of 3 M de KOH, 0.15 M de Na2SiO3 and 0.1 M Na2B4O7.10H2O. Graphene oxide was added to this bath at three different concentrations: 0.5 g.L−1, 1.0 g.L−1 and 3.0 g.L−1. The ability of the graphene oxide nanofiller to enhance the corrosion resistance of the ZK60A alloy was evaluated by electrochemical impedance spectroscopy and potentiodynamic polarization tests in 3.5 wt.% NaCl solution. The surface chemical composition was assessed by X-ray photoelectron spectroscopy (XPS). Scanning electron microscopy (SEM) coupled with EDS analysis was employed to examine the anodized layer morphology and thickness. The results pointed to a beneficial effect of graphene oxide addition on the corrosion resistance of the anodized ZK60A which was dependent on the concentration of the nanofiller in the anodizing electrolyte.

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Influence of Intermetallic Particles on the Corrosion Properties of Extruded ZK60 Mg Alloy Containing Cu

Cited by 10 publications

References 31 publications

Microstructure and Corrosion of Cast Magnesium Alloy ZK60 in NaCl Solution

Microstructure and Corrosion of Cast Magnesium Alloy ZK60 in NaCl Solution

The corrosion behaviour of a novel Mg–Zn–Zr–Y–Cu alloy

Effect of Graphene Oxide as an Anodizing Additive for the ZK60A Magnesium Alloy: Correlating Corrosion Resistance, Surface Chemistry and Film Morphology

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