Influence of Ru additions on the corrosion behaviour of WC-Co cemented carbide alloys in sulphuric acid

J. H. Potgieter; N. Thanjekwayo; P. Olubambi; N. Maledi; S. S. Potgieter-Vermaak

doi:10.1016/j.ijrmhm.2011.02.007

Influence of Ru additions on the corrosion behaviour of WC-Co cemented carbide alloys in sulphuric acid

J. H. Potgieter, N. Thanjekwayo, P. Olubambi, N. Maledi, S. S. Potgieter-Vermaak

Research output: Contribution to journal › Article › peer-review

58 Citations (Scopus)

Abstract

The aim of the study is to investigate the influence of ruthenium (Ru) additions on the corrosion behaviour of WC-Co cemented carbides when exposed in a reducing acid medium. The study involved the characterization of the microstructures, morphologies and phases present by using the optical microscopy, SEM, XRD and Raman spectroscopy before and after corrosion. The corrosion behaviour was investigated using the electrochemical polarization tests and chronoamperometry. Ruthenium affects the cathodic Tafel constant (β_c) in 1 M H₂SO₄, which indicates that it influences the cathodic part of the corrosion reaction. It also appears that Ru is more effective in improving corrosion resistance than a small vanadium carbide addition. Therefore, ruthenium additions of up to 3 wt.% Ru increased the corrosion resistance of the WC-Co alloys.

Original language	English
Pages (from-to)	478-487
Number of pages	10
Journal	International Journal of Refractory Metals and Hard Materials
Volume	29
Issue number	4
DOIs	https://doi.org/10.1016/j.ijrmhm.2011.02.007
Publication status	Published - Jul 2011
Externally published	Yes

Keywords

Corrosion
Ruthenium
Sulphuric acid
Surface films
Tungsten carbides

ASJC Scopus subject areas

Ceramics and Composites
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.ijrmhm.2011.02.007

Cite this

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title = "Influence of Ru additions on the corrosion behaviour of WC-Co cemented carbide alloys in sulphuric acid",

abstract = "The aim of the study is to investigate the influence of ruthenium (Ru) additions on the corrosion behaviour of WC-Co cemented carbides when exposed in a reducing acid medium. The study involved the characterization of the microstructures, morphologies and phases present by using the optical microscopy, SEM, XRD and Raman spectroscopy before and after corrosion. The corrosion behaviour was investigated using the electrochemical polarization tests and chronoamperometry. Ruthenium affects the cathodic Tafel constant (βc) in 1 M H2SO4, which indicates that it influences the cathodic part of the corrosion reaction. It also appears that Ru is more effective in improving corrosion resistance than a small vanadium carbide addition. Therefore, ruthenium additions of up to 3 wt.% Ru increased the corrosion resistance of the WC-Co alloys.",

keywords = "Corrosion, Ruthenium, Sulphuric acid, Surface films, Tungsten carbides",

author = "Potgieter, {J. H.} and N. Thanjekwayo and P. Olubambi and N. Maledi and Potgieter-Vermaak, {S. S.}",

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AU - Potgieter, J. H.

AU - Thanjekwayo, N.

AU - Olubambi, P.

AU - Maledi, N.

AU - Potgieter-Vermaak, S. S.

PY - 2011/7

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N2 - The aim of the study is to investigate the influence of ruthenium (Ru) additions on the corrosion behaviour of WC-Co cemented carbides when exposed in a reducing acid medium. The study involved the characterization of the microstructures, morphologies and phases present by using the optical microscopy, SEM, XRD and Raman spectroscopy before and after corrosion. The corrosion behaviour was investigated using the electrochemical polarization tests and chronoamperometry. Ruthenium affects the cathodic Tafel constant (βc) in 1 M H2SO4, which indicates that it influences the cathodic part of the corrosion reaction. It also appears that Ru is more effective in improving corrosion resistance than a small vanadium carbide addition. Therefore, ruthenium additions of up to 3 wt.% Ru increased the corrosion resistance of the WC-Co alloys.

AB - The aim of the study is to investigate the influence of ruthenium (Ru) additions on the corrosion behaviour of WC-Co cemented carbides when exposed in a reducing acid medium. The study involved the characterization of the microstructures, morphologies and phases present by using the optical microscopy, SEM, XRD and Raman spectroscopy before and after corrosion. The corrosion behaviour was investigated using the electrochemical polarization tests and chronoamperometry. Ruthenium affects the cathodic Tafel constant (βc) in 1 M H2SO4, which indicates that it influences the cathodic part of the corrosion reaction. It also appears that Ru is more effective in improving corrosion resistance than a small vanadium carbide addition. Therefore, ruthenium additions of up to 3 wt.% Ru increased the corrosion resistance of the WC-Co alloys.

KW - Corrosion

KW - Ruthenium

KW - Sulphuric acid

KW - Surface films

KW - Tungsten carbides

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Influence of Ru additions on the corrosion behaviour of WC-Co cemented carbide alloys in sulphuric acid

Abstract

Keywords

ASJC Scopus subject areas

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