Yiqi Zhou , Yikun Liu , Shuoyang Wang , Zhansu Yue , Yucheng Ji , Wentao Qin , Decheng Kong , Xiang Wu , Jiang Liu , Wei Huang , Chaofang Dong
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引用次数: 0
摘要
在 0.05 M H2SO4、0.1 M Na2SO4 和 0.1 M NaOH 中测试了经过不同后热处理（1100 ℃、1100 ℃ + 400 ℃、1100 ℃ + 500 ℃、1100 ℃ + 600 ℃）的 WC-12Co 的腐蚀性能。热处理会影响 WC-12Co 在酸性和中性环境中的腐蚀性能。但是，WC-12CO 在碱性溶液中的腐蚀性能与热处理无关。W 和 C 在淬火过程中扩散到 Co 中，大大提高了耐腐蚀性能，而较高的退火温度会略微降低腐蚀性能。在 +0.2 VSCE、+0.5 VSCE 和 +0.8 VSCE 条件下 30 分钟，通过 EIS 和电位动态极化测试的腐蚀成核参数等级与电位静态极化测量的腐蚀膨胀率不尽相同。利用扫描电镜、XPS 和 DFT 计算分析了在不同 pH 值下测试的腐蚀机理。
The corrosion performance for ultrafine WC-12Co processed by heat treatments in different pH solutions
The corrosion performance of WC-12Co after different post heat treatments (1100 °C, 1100 °C + 400 °C, 1100 °C + 500 °C, 1100 °C + 600 °C), were tested in 0.05 M H2SO4, 0.1 M Na2SO4, and 0.1 M NaOH. Heat treatments influence the corrosion performance of WC-12Co in acidic and neutral environments. However, the corrosion properties for WC-12CO in alkaline solutions are independent of the heat treatments. W and C diffuse to Co from the quenching process, dramatically improving corrosion resistance, with higher annealing temperature slightly reduces the corrosion performance. The rank of corrosion nucleation parameter tested by EIS and potentio-dynamic polarisation, with the corrosion expansion rate measured by potentio-static polarisation at +0.2 VSCE, + 0.5 VSCE, and + 0.8 VSCE for 30 min are not the same. The corrosion mechanism tested in different pH values is analysed using SEM, XPS, and DFT calculations.
期刊介绍：
The International Journal of Refractory Metals and Hard Materials (IJRMHM) publishes original research articles concerned with all aspects of refractory metals and hard materials. Refractory metals are defined as metals with melting points higher than 1800 °C. These are tungsten, molybdenum, chromium, tantalum, niobium, hafnium, and rhenium, as well as many compounds and alloys based thereupon. Hard materials that are included in the scope of this journal are defined as materials with hardness values higher than 1000 kg/mm2, primarily intended for applications as manufacturing tools or wear resistant components in mechanical systems. Thus they encompass carbides, nitrides and borides of metals, and related compounds. A special focus of this journal is put on the family of hardmetals, which is also known as cemented tungsten carbide, and cermets which are based on titanium carbide and carbonitrides with or without a metal binder. Ceramics and superhard materials including diamond and cubic boron nitride may also be accepted provided the subject material is presented as hard materials as defined above.
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