Corrosion properties of Co-based cemented carbides in acidic solutions

Sutthiruangwong, Sutha; Mori, Gregor

doi:10.1016/s0263-4368(03)00027-1

Cited by 119 publications

(71 citation statements)

References 9 publications

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“…Samples with η-phase were selected in order to investigate the influence of η-phase on the electrochemical properties of WC-Co cemented carbides. Some investigations indicate that η-phase could improve the corrosion resistance of cemented carbides [10][11][12] size of the starting powder. The achieved densities of all samples sintered in hydrogen are lower than the theoretical density.…”

Section: Resultsmentioning

confidence: 99%

“…Samples with η-phase were selected in order to investigate the influence of η-phase on the electrochemical properties of WC-Co cemented carbides. Some investigations indicate that η-phase could improve the corrosion resistance of cemented carbides [10][11][12]. Samples WC-9Co/1S, WC-6Co/4V and WC-6Co/4S with a WC grain size dWC <200 nm can be classified as nanostructured WC-Co cemented carbides while all other samples with a WC grain size dWC > 200, near 200 nm, can be classified as near-nano cemented carbides.…”

Section: Resultsmentioning

confidence: 99%

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Electrochemical Corrosion Behavior of Near-Nano and Nanostructured WC-Co Cemented Carbides

Alar

Fabijanić

2017

Metals

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Abstract:In this paper, the electrochemical corrosion resistance of near-nano and nanostructured WC-Co cemented carbides was investigated. WC powders with an average grain size d BET in the range from 95 nm to 150 nm and with an addition of vanadium carbide (VC) and chromium carbide Cr 3 C 2 as grain growth inhibitors were used as starting powders. The mixtures with 6 wt. % and 9 wt. % Co were consolidated by two different processes; sintering in hydrogen atmosphere and the sinter-HIP process. WC-Co samples were researched by direct current and alternating current techniques in the solution of 3.5% NaCl at room temperature. Corrosion parameters such as corrosion potential (E corr ), corrosion current density (j corr ) and polarization resistance (R p ) were determined by electrochemical techniques. From the conducted research, it was found that the consolidation processes and microstructural characteristics-grain growth inhibitors, grain size of the starting WC powders and η-phase-influenced the electrochemical corrosion resistance. η-phase enhanced the formation of a passive layer on the samples' surfaces, thereby reducing the tendency of the sample dissolution and increasing the stability of oxides forming therewith a passive layer on the sample surface.

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Section: Resultsmentioning

confidence: 99%

“…Samples with η-phase were selected in order to investigate the influence of η-phase on the electrochemical properties of WC-Co cemented carbides. Some investigations indicate that η-phase could improve the corrosion resistance of cemented carbides [10][11][12]. Samples WC-9Co/1S, WC-6Co/4V and WC-6Co/4S with a WC grain size dWC <200 nm can be classified as nanostructured WC-Co cemented carbides while all other samples with a WC grain size dWC > 200, near 200 nm, can be classified as near-nano cemented carbides.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Corrosion Behavior of Near-Nano and Nanostructured WC-Co Cemented Carbides

Alar

Fabijanić

2017

Metals

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“…The polarization behavior of our samples agrees well with earlier potentiodynamic measurements on WC-Co-based hardmetals shown in Refs. [6,7,10,13,14]. The potentiodynamic curve can be described by an exponential increase in the cathodic current density as a function of the polarization.…”

Section: Typical Hardmetal Potential-current Density Curvesmentioning

confidence: 99%

“…At higher potentials usually a pseudopassive region exists in the potentiodynamic curve of WC-Co/Ni hardmetals [7,14]. Human and Exner [13] attributed pseudopassivity to the formation of an anodic film e.g.…”

Section: Pseudopassivitymentioning

confidence: 99%

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Influence of binder metal and surface treatment on the corrosion resistance of (W,Ti)C-based hardmetals

Barbatti

Sket

García³

et al. 2006

Surface and Coatings Technology

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The effect of a nitridation surface treatment on the microstructure and corrosion resistance of Co and Ni-binder (W,Ti)C-based hardmetals with additions of (Ta,Nb)C was investigated. Nitridation treatment produces a surface layer with a higher hard phase (Ti,Ta,Nb,W)(C,N) content. The near-surface layer thickness and microstructure are affected by the choice of binder (Co respectively Ni). The corrosion resistance of the hardmetals was characterized using linear sweep voltammetry. The microstructure of the hardmetals was determined before and after corrosive attack by optical microscopy and SEM. The results of the corrosion tests and microstructure analyses are interpreted in terms of the correlation between the hardmetal morphology and porosity and ion transport through the interface binder-electrolyte. The nitridation treatment of the hardmetals strongly increases the resistance to aggressive corrosion media for hardmetals both with Co and Ni-binder phase and thus may positively influence the hardmetal lifetime in cutting applications in chemically aggressive environments.

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Metal Carbides

Lee

2010

Encyclopedia of Catalysis

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Transition metal carbides of early transition metals attracted considerable attention as catalysts because of their availability with high specific areas and surface cleanness. Their refractory properties render them resistance against attrition and sintering under reaction conditions. They are catalytically active in many reactions, particularly those involving hydrogen transfer such as hydrotreating (hydrodesulfurization, hydrodenitrogenation, and hydrodeoxygenation), hydrogenation, dehydrogenation, isomerization, hydrogenolysis, reforming, and aromatization. Recently, they are also receiving attention as electrocatalysis. In many of these reactions, metal carbides behave like group 8–10 metals (Pt, Pd, Rh, Ru, etc) of high cost and limited supply and have potential to replace them. Structure, bonding, synthesis, and surface reactivity of transition metal carbides are discussed.

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Corrosion properties of Co-based cemented carbides in acidic solutions

Cited by 119 publications

References 9 publications

Electrochemical Corrosion Behavior of Near-Nano and Nanostructured WC-Co Cemented Carbides

Electrochemical Corrosion Behavior of Near-Nano and Nanostructured WC-Co Cemented Carbides

Influence of binder metal and surface treatment on the corrosion resistance of (W,Ti)C-based hardmetals

Metal Carbides

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