Investigation of the electrochemical behaviour of WC–Co hardmetal with electrochemical and surface analytical methods

Schnyder, B.; Stössel-Sittig, Caroline; Kötz, R.; Hochstrasser-Kurz, Sabine; Virtanen, Sannakaisa; Jaeggi, Christian; Eichenberger, Nicolas; Siegenthaler, H.

doi:10.1016/j.susc.2004.06.102

Cited by 37 publications

(18 citation statements)

References 5 publications

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“…After corrosion test in alkaline 0.5 M NaOH electrolyte (Fig. 4c), dissolution of binder and carbide is seen which is similarly found by Schnyder et al [15] who studied on WC-Co and single element of WC and Co electrochemical behaviour in alkaline solution. They found that in alkaline solution without chlorine, WC-Co behave in between WC and Co and concluded as both element dissolve in the solution which in contrast with Hochstrasser et al [10] conclusion which suggest cobalt passivation and WC dissolution in alkaline electrolyte.…”

Section: Resultssupporting

confidence: 83%

Corrosion Behavior of WC-Co Cermet Coatings

Kamdi

Phang

Ahmad

2015

MSF

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Abstract. Metal-ceramic composite or cermet coatings have become popular due to their enhanced wear and corrosion resistance properties. Cermet consists of ceramic particulate embedded in a metallic binder. WC-Co coatings are often used in applications that require wear resistance, but there are many applications in which thermally sprayed coatings have been deposited on components that operate under both abrasive and corrosive condition. Thus, in this study, the corrosion behavior of WC-12wt%Co in different electrolyte has been evaluated. Electrochemical test has been done in three electrolytes namely 0.5 M hydrochloric acid, HCl, 0.5 M sulfuric acid, H 2 SO 4 and 0.5 M sodium hydroxide, NaOH. It is found that corrosion potential of this coating in acidic environment is more positive compares to in alkaline environment. Both in acid and alkaline electrolyte, binder dissolution were preferential. It may be concluded that this coating have higher corrosion resistance in alkaline electrolyte than in acid electrolyte.

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Section: Resultssupporting

confidence: 83%

Corrosion Behavior of WC-Co Cermet Coatings

Kamdi

Phang

Ahmad

2015

MSF

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“…e pseudopassive behavior observed for WC-10Co hardmetal in the NaCl test solution is in contrast with other literatures [27] where dilute (0.1 M) NaCl solutions were used. is is because the higher Cl − anion concentration used in this study compared to literature favours passivation [28].…”

Section: Potentiodynamic Polarisation Behaviourcontrasting

confidence: 87%

Corrosion of WC-VC-Co Hardmetal in Neutral Chloride Containing Media

et al. 2013

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The effect of varying VC content on the corrosion behavior of WC-10 wt% Co hardmetals in sodium chloride (NaCl) and synthetic mine water (SMW) solutions has been investigated using anodic polarization scans and surface analytical methods. It is shown that the polarization behavior is active-pseudopassive in NaCl and active in SMW regardless of the VC content, while the corrosion resistance is poorer and independent of VC content in NaCl but better at high VC contents in SMW. The corrosion behavior of samples is explained using the effect of VC on the chemical composition of the binder.

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“…They indicated that the major controlling factor is the solution pH and concluded that in neutral and acidic solutions, the corrosion process of WC-Co consists mainly of Co dissolution, whereas for an alkaline pH value the WC dissolution becomes more significant. Similar results were presented by Schneider et al 6 who indicated that the electrochemical behaviour of the WC-Co hardmetal resembles strongly the behaviour of pure Co and that the galvanic coupling with the WC component of the material may enhance the dissolution rate of the Co binder in the hardmetal, leading to a rough appearance of the surface and to a loss of the WC particles, which can fall out.…”

Section: Introductionsupporting

confidence: 86%

Effect of TiAlN PVD coatings on corrosion performance of WC–6%Co

Gil

Liscano

Goudeau

et al. 2010

Surface Engineering

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The present study has been carried out to evaluate the corrosion performance of three different (Ti12xAlx)N/TiN multilayers coatings commercially deposited on WC-Co inserts. Two of these coatings were nanostructured, and all of them presented different Ti/Al atomic ratios varying from 2 : 3 up to 7 : 3 and were deposited by employing a commercial physical vapour deposition cathodic arc process. X-ray diffraction analysis indicated that the grain size for both the TiAlN and TiN layers in the coatings architecture, varied between approximately 9 to 14 nm. The corrosion performance was evaluated in a 3 wt-%NaCl solution using both open circuit potential and potentiodynamic polarisation measurements. Scanning electron microscopy and energy dispersive spectroscopy surface characterisation before and after corrosion testing allowed the determination that all the coatings under study show a corrosion current density of approximately one order of magnitude smaller than the uncoated substrate, indicating thus their beneficial effect from the corrosion protection viewpoint.

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Investigation of the electrochemical behaviour of WC–Co hardmetal with electrochemical and surface analytical methods

Cited by 37 publications

References 5 publications

Corrosion Behavior of WC-Co Cermet Coatings

Corrosion Behavior of WC-Co Cermet Coatings

Corrosion of WC-VC-Co Hardmetal in Neutral Chloride Containing Media

Effect of TiAlN PVD coatings on corrosion performance of WC–6%Co

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