Improved electrochemical and mechanical performance of WC-Co cemented carbide by replacing a part of Co with Al2O3

Fazili, Ali; Derakhshandeh, Mohammad Reza; Nejadshamsi, Shayan; Nikzad, Leila; Razavi, Mansour; Ghasali, Ehsan

doi:10.1016/j.jallcom.2020.153857

Cited by 39 publications

(12 citation statements)

References 55 publications

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“…The pseudo-passivation behaviors occurred when the pseudo-passivation current density of the composite at higher potential was several orders of magnitude higher than the passivation current density. The pseudo-passivation observed here for WC-Co carbide alloy is consistent with other reported study [32]. On one hand, Co binder has a low corrosion potential compared with WC phase [32], so it can be said that Co binder has the priority of dissolution, and WC phase is protected by the cathode.…”

Section: Ocp Monitoringsupporting

confidence: 91%

“…The pseudo-passivation observed here for WC-Co carbide alloy is consistent with other reported study [32]. On one hand, Co binder has a low corrosion potential compared with WC phase [32], so it can be said that Co binder has the priority of dissolution, and WC phase is protected by the cathode. On the other hand, WC phase could be oxidized at anodic potential.…”

Section: Ocp Monitoringsupporting

confidence: 91%

“…It also can be inferred that cobalt is far more corrosive than tungsten in NaCl solution. Ali Fazili et al [36] has reported that Co binder was preferentially dissolved, subsequently a part of WC particles was corroded in NaCl solution.…”

Section: Tafel Curvesmentioning

confidence: 99%

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Comparison On The Immersion Corrosion and Electrochemical Performance of WC-Al2O3 Composites and WC-Co Hard Metal in NaCl Solution

Han

Dong

Fan

et al. 2021

Preprint

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WC-15wt.%Al2O3 composites was prepared via hot pressing sintering technology. The corrosion behaviors of WC-Al2O3 composites and traditional WC-Co hard alloy in NaCl solution were studied by immersion corrosion and electrochemical technique. The impedance value of WC-Al2O3 composite increased more rapidly than WC-Co hard metal during the 24 hours, which indicated that WC-Al2O3 composites has more compact passivation film than WC-Co hard metal. The results confirmed that the corrosion performance of WC-Al2O3 composites was higher than WC-Co cemented carbide in NaCl solution. The corrosion mechanism of WC-Al2O3 composites and WC-Co hard alloy in NaCl solution were also revealed by SEM, EDS, XPS and Raman. The corrosion products of WC-Al2O3 composites mainly contain WO3, while for WC-Co hard alloy are Co (OH)2, Co3O4 and WO3. The different corrosion mechanism of the two materials is attributed to the Al2O3 phase instead of the Co binder, which avoids the galvanic corrosion between WC phase and Co binder.

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Section: Ocp Monitoringsupporting

confidence: 91%

Section: Ocp Monitoringsupporting

confidence: 91%

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Comparison On The Immersion Corrosion and Electrochemical Performance of WC-Al2O3 Composites and WC-Co Hard Metal in NaCl Solution

Han

Dong

Fan

et al. 2021

Preprint

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show abstract

“…It can also be observed that the semi-circle radius in the Nyquist plot of this sample was decreased after 24 h, indicating a decrease in corrosion resistance during this period. This can be due to the destruction of the non-dense oxide film on the surface of the sample that could be occurred in corrosive environments, especially Cl − containing media [33][34][35][36]. The impedance of the specimen increased after 48 h of immersion and decreased again after 72 h, suggesting a re-formation and destruction of the non-dense oxide film in surface of the sample.…”

Section: Effect Of Hpt Process On Electrochemical Properties Of Austenitic Niti Alloymentioning

confidence: 99%

Effects of high-pressure torsion treatment on the microstructural aspects and electrochemical behaviour of austenitic NiTi shape memory alloy

Derakhshandeh

Farvizi

Javaheri

2020

J Solid State Electrochem

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In this study, microstructural aspects and electrochemical properties of high-pressure torsion (HPT)-treated austenitic NiTi alloy were investigated. Microstructural characterizations were performed by high-resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD) analysis. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests were used to evaluate the electrochemical properties in simulated body fluid (SBF) solution. It was found that HPT process increased the martensitic phase from 8.22 to 71.31 wt%. HRTEM results revealed a combination of amorphous/ nanocrystalline austenitic and martensitic phases of NiTi after HPT. The lower value of corrosion current density of HPTtreated NiTi (2.5 × 10 −6 A/cm 2 ) was observed compared with the untreated sample (7.6 × 10 −6 A/cm 2 ). EIS tests confirmed higher corrosion resistance of the HPT-treated sample. EIS analysis showed a decrease and increase in the impedance value of the specimens at different immersion times indicating the formation and degradation of oxide films over time on the specimens' surface. However, the impedance value of the HPT-treated sample was more than that of the untreated sample. Localized corrosion is observed at the surface of the untreated specimen due to the absence of a dense oxide protective film but no evidence of localized and pitting corrosion on the surface of HPT-treated sample was observed.

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“…It also can be inferred that cobalt is far more corrosive than tungsten in NaCl solution. Ali Fazili et al37 has reported that Co binder was preferentially dissolved, subsequently a part of WC particles was…”

mentioning

confidence: 99%

Comparison on the immersion corrosion and electrochemical corrosion resistance of WC–Al₂O₃ composites and WC–Co cemented carbide in NaCl solution

et al. 2021

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Improved electrochemical and mechanical performance of WC-Co cemented carbide by replacing a part of Co with Al2O3

Cited by 39 publications

References 55 publications

Comparison On The Immersion Corrosion and Electrochemical Performance of WC-Al2O3 Composites and WC-Co Hard Metal in NaCl Solution

Comparison On The Immersion Corrosion and Electrochemical Performance of WC-Al2O3 Composites and WC-Co Hard Metal in NaCl Solution

Effects of high-pressure torsion treatment on the microstructural aspects and electrochemical behaviour of austenitic NiTi shape memory alloy

Comparison on the immersion corrosion and electrochemical corrosion resistance of WC–Al₂O₃ composites and WC–Co cemented carbide in NaCl solution

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Improved electrochemical and mechanical performance of WC-Co cemented carbide by replacing a part of Co with Al2O3

Cited by 39 publications

References 55 publications

Comparison On The Immersion Corrosion and Electrochemical Performance of WC-Al2O3 Composites and WC-Co Hard Metal in NaCl Solution

Comparison On The Immersion Corrosion and Electrochemical Performance of WC-Al2O3 Composites and WC-Co Hard Metal in NaCl Solution

Effects of high-pressure torsion treatment on the microstructural aspects and electrochemical behaviour of austenitic NiTi shape memory alloy

Comparison on the immersion corrosion and electrochemical corrosion resistance of WC–Al2O3 composites and WC–Co cemented carbide in NaCl solution

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Comparison on the immersion corrosion and electrochemical corrosion resistance of WC–Al₂O₃ composites and WC–Co cemented carbide in NaCl solution