对WC-NiMo和WC-Co水泥化碳化物腐蚀行为的比较研究
Nádia Alves Nery Balbino1, Edmilson Otoni Corrêa2, Danilo Roque Huanca3
1Institute of Natural Resources, Federal University of Itajubá, Itajubá 37500-903, Brazil.
Materials (Basel, Switzerland)
|June 28, 2023
概括
与传统的WC-cobalt (WC-Co) 合金相比,- (WC-NiMo) 硬化碳化物具有更强的耐腐蚀性. 这一改进归因于更稳定的微观结构和在腐蚀性环境中优越的被动化能力.
科学领域:
- 材料科学 材料科学 材料科学
- 腐蚀工程 腐蚀工程
- 粉末金工艺 在粉末金工艺
背景情况:
- 基于碳化 (WC) 的化碳化由于其硬度和耐磨性而被广泛使用.
- (Co) 是常规的粘合金属,但其对腐蚀的敏感性限制了在侵蚀性环境中的应用.
- 开发替代的粘合剂系统对于扩大化碳化物的使用至关重要.
研究的目的:
- 为了研究 (Ni) 粘合金属与碳化 (Mo2C) 对基于WC的水泥碳化的微观结构和腐蚀行为的影响.
- 为了比较这些新型WC-NiMo水泥碳化物与传统的WC-Co水泥碳化物的性能.
- 在盐水环境中使用电化学技术评估耐腐蚀性.
主要方法:
- 粉末金技术被用来加工WC-NiMo和WC-Co水泥碳化物.
- 微结构性特征包括光学显微镜,扫描电子显微镜 (SEM),能量分散式X射线光谱 (EDS) 和X射线衍射 (XRD).
- 使用开放电路电位 (OCP),电动极化和电化学阻抗光谱 (EIS) 在3.5%重量NaCl溶液中评估了耐腐蚀性.
主要成果:
- WC-NiMo水泥碳化物表现出具有孔隙和粘合剂岛屿的微观结构,类似于WC-Co.
- 与WC-Co.Co.相比,WC-NiMo具有更高的耐腐蚀性和更高的被动化能力.
- 电化学测试显示WC-NiMo的负腐蚀潜力 (Ecorr) 较小,电流密度较低,表明腐蚀率降低和被动层形成.
结论:
- 添加结合物金属和碳化物显著提高了基于WC的水泥碳化物的耐腐蚀性.
- 在需要高耐腐蚀性能的应用中,WC-NiMo水泥碳化物为WC-Co提供了一个有前途的替代品.
- 性能提升与微观结构特性和WC-NiMo合金上形成稳定的被动层有关.
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