CoCrNi粘结剂增强模拟钻井液中硬质合金的耐蚀性

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-04-01 DOI:10.1016/j.ceramint.2025.01.023

Jiayi Liu , Kaiyuan Hao , Ruonan Zhou , Xuelian Xiao , Guoming Yuan , Kai Xu , Ming Lou , Keke Chang

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引用次数: 0

摘要

硬质合金作为钻井工具的重要表面强化材料，在碱性钻井液中受到严重腐蚀。为了解决这一问题，我们在热力学计算的基础上设计了一种新型的含有多主元素合金结合剂CoCrNi的wc基硬质合金，并通过真空烧结合成了它们。以WC-Co为对照，通过极化和微电化学测试评估WC-CoCrNi在模拟钻井液中的腐蚀行为。结果表明，WC-CoCrNi的腐蚀电流密度降低了约70%，极化电阻提高了一个数量级。这主要归功于Cr和Ni在Co中的固溶，降低了陶瓷相和金属相之间的电位差，从而减轻了电偶腐蚀倾向。此外，WC-CoCrNi表面的腐蚀产物层主要由Cr2O3、NiO和Ni(OH)2组成，也起到了防腐作用。因此，目前的工作证明了通过粘结剂组合物的热力学设计获得耐腐蚀硬质合金的可行性。

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Enhancing the corrosion resistance of cemented carbides using CoCrNi binders in simulated drilling fluids

As critical surface strengthening materials for drilling tools, the cemented carbides have been observed to suffer from severe corrosion in alkaline drilling fluids. To address such issue, we designed novel WC-based cemented carbides incorporating multi-principal element alloy binders, CoCrNi, based on thermodynamic calculations, and synthesized them via vacuum sintering. The corrosion behaviors of WC-CoCrNi in simulated drilling fluids were assessed via polarization and microelectrochemistry tests, with the WC-Co used as reference. The results showed that the WC-CoCrNi exhibited reduced corrosion current densities by ∼70 % and an improved polarization resistance by an order of magnitude. Such improvement was attributed to the solid-solution of Cr and Ni in Co, which decreased the potential difference between ceramic and metallic phases thus mitigated the galvanic corrosion tendency. The corrosion product layers on the WC-CoCrNi surfaces, in addition, mainly consisted of Cr₂O₃, NiO and Ni(OH)₂, also contributing to corrosion protection. Therefore, the current work demonstrates the viability to obtain corrosion-resistant cemented carbides through the thermodynamic design of binder compositions.

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.