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

被引：52

作者：

Potgieter, J. H. ^{[1
,2
]}

Thanjekwayo, N. ^{[2
,3
]}

Olubambi, P. ^{[4
]}

Maledi, N. ^{[2
]}

Potgieter-Vermaak, S. S. ^{[5
,6
]}

机构：

[1] Manchester Metropolitan Univ, Sch Res Enterprise & Innovat, Manchester M1 5GD, Lancs, England

[2] Univ Witwatersrand, Sch Chem & Met Engn, ZA-2050 Johannesburg, South Africa

[3] Univ Witwatersrand, DST NRF Ctr Excellence Strong Mat, ZA-2050 Johannesburg, South Africa

[4] Tshwane Univ Technol, Dept Chem & Met Engn, ZA-0001 Pretoria, South Africa

[5] Manchester Metropolitan Univ, Sch Sci & Environm, Manchester M1 5GD, Lancs, England

[6] Univ Witwatersrand, Sch Chem, ZA-2050 Johannesburg, South Africa

来源：

INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2011年 / 29卷 / 04期

关键词：

Ruthenium; Tungsten carbides; Corrosion; Sulphuric acid; Surface films; ELECTROCHEMICAL-BEHAVIOR; RUTHENIUM ADDITIONS; STAINLESS-STEELS; RESISTANCE; COBALT; POLARIZATION; COATINGS; RAMAN;

D O I：

10.1016/j.ijrmhm.2011.02.007

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 (beta(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. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved.

引用

页码：478 / 487

页数：10

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