Corrosion-resistant WC-Co based cemented carbides: Computational design and experimental verification
Source abstract
Abstract
Elemental modification of traditional cemented carbides could impart better service properties for offshore drilling applications. The WC-Co-Al cemented carbides that weaken the galvanic corrosion effect and expand the immunity were designed based on calculated phase diagram and Pourbaix diagram, with experiments performed to demonstrate their corrosion resistance. As the Al content increased to 0.8 wt%, the corrosion current density decreased by two orders of magnitude and the charge transfer resistance doubled, with a less-damaged binder phase, indicating an improved corrosion resistance. Furthermore, the corrosion products of WC, Al, and Co were WO 3, Al 2O 3, Co 3O 4, and a small amount of Co(OH) 2, respectively, showing a very good agreement between experiments and the calculated Pourbaix diagram. Therefore, the here adopted comparative theoretical and experimental research strategy enables the efficient design of corrosion-resistant cemented carbides.
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