Analytical characterization of the corrosion mechanisms of WC–Co by electrochemical methods and inductively coupled plasma mass spectroscopy

Hochstrasser, S.; Mueller, Yves; Latkoczy, Christopher; Virtanen, Sannakaisa; Schmutz, Patrik

doi:10.1016/j.corsci.2006.08.022

Cited by 138 publications

(73 citation statements)

References 29 publications

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“…For instance the presence of carbides in a metallic surface, typically formed for improved wear resistance, establishes a micro-corrosion cell as the carbide is likely to be cathodic with respect to the surrounding metallic matrix. This can result in preferential anodic dissolution of the metallic matrix close to or at the matrix/carbide interface and thereby accelerate carbide removal from surfaces and reduce the antiwear properties of the surface, [3].…”

Section: Additional Factors Associated With Coatingsmentioning

confidence: 99%

Tribo-corrosion of coatings: a review

Wood¹

2007

J. Phys. D: Appl. Phys.

227

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This paper reviews the available literature relating to the emerging research into the performance of coatings under combined wear and corrosion conditions. Understanding how coatings perform under these tribo-corrosion conditions is essential if the service life of equipment is to be predicted and to allow service life to be extended. Therefore, the tribo-corrosion performance of coatings deposited by a variety of techniques is discussed and the main mechanisms associated with their degradation under combined wear and corrosion highlighted. Coating composition, microstructure, defect level, adhesion, cohesion and substrate properties are seen as some of the critical elements in coating performance when subjected to tribo-corrosion contacts. The importance of post-coating deposition treatments such as laser resurfacing and sealing are also discussed. Interactions between wear and corrosion mechanisms are identified along with some models and mapping techniques that aim to inform coating selection and predict performance. Recent investigations into mono-layer as well as multilayered and functionally graded coatings are reviewed as candidates for wear-corrosion resistant surfaces. The review reveals the need for a more considered approach to tribo-corrosion testing and the way in which the results are analysed and presented. For example, the test conditions should be appropriate to the coating system under test; the level of in situ instrumentation deployed and the post-test analysis of in situ electrochemical data should be carefully selected as well as details given of the composition of any surface tribofilms formed and the identification of the degradation mechanisms.

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Section: Additional Factors Associated With Coatingsmentioning

confidence: 99%

Tribo-corrosion of coatings: a review

Wood¹

2007

J. Phys. D: Appl. Phys.

227

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“…Many authors have shown that the rate of corrosion depends on the concentration and temperature of corrosive fluids, exposure time, and most of all, on the pH of the fluid [2]. Conventional WC-Co cemented carbides are characterized by poor corrosion resistance in acid or neutral aqueous solutions for pH ≤7 due to the susceptibility of Co to wet corrosion [3].…”

Section: Introductionmentioning

confidence: 99%

“…Corrosion resistance and electrochemical properties are not a prime requirement of cemented carbides, nevertheless, these properties are very important in industrial use since the application area of cemented carbides is rapidly growing due to their superior mechanical properties, high hardness and high toughness, and good wear resistance [1][2][3][4]. Cemented carbides are used in the chemical and petroleum industry for applications such as flow control components, oil and gas inserts such as drill bits, drilling rigs, brag bit profiles, chisel buttons and metal forming tools where they are exposed to an aggressive environment which requires erosion and corrosion resistance [3,5].…”

Section: Introductionmentioning

confidence: 99%

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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“…The X-ray results suggest that the boron atoms diffuse into the cemented carbides reacting with Co and WC [9]. It is assumed that the following reactions would take place simultaneously:…”

Section: Resultsmentioning

confidence: 99%

Boride coating on the surface of WC–Co-based cemented carbide

Márquez-Herrera

Bermúdez-Rodríguez

Hernández-Rodríguez

et al. 2016

International Journal of Materials Research

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In this study, the structural properties and enhancement in the hardness of commercial WC-Co-based cemented carbide inserts are reported after the formation of a boronised layer on the surface. A boronising thermochemical treatment was given at 900 8C for 4 h. X-ray diffraction analysis verified the treatment in the presence of peaks associated with the Co 2 B and W 2 CoB 2 phases. The hardness of the samples used in the boronising process increased from 1492 HV up to 2000 HV. The typical values of the thickness of the boronised layer were measured to be around 28 lm. The results of a tool-life test suggest that boride coating effectively enhances the cutting performance of the samples.

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Analytical characterization of the corrosion mechanisms of WC–Co by electrochemical methods and inductively coupled plasma mass spectroscopy

Cited by 138 publications

References 29 publications

Tribo-corrosion of coatings: a review

Tribo-corrosion of coatings: a review

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

Boride coating on the surface of WC–Co-based cemented carbide

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