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通过水冷铜坩埚磁悬浮熔炼炉和负压铜模吸铸法制备了(TiZrHf)50Ni30Cu20-xCox(x=2、4和6 at%)高熵形状记忆合金，采用电化学工作站测试其在3.5 mass%NaCl溶液中的腐蚀性能。结果表明：(TiZrHf)50Ni30Cu20-xCox合金由B2相和B19′相构成，随着Co含量的增加，B2相的衍射峰强度逐渐增加，同时合金的混合熵也增大；合金在3.5 mass%NaCl溶液中表现出钝化行为，随着Co含量的增加，合金的腐蚀电流密度减小，点蚀电位、容抗弧半径和极化电阻增大，同时点蚀坑数量逐渐减少，表明合金的耐腐蚀性能提高；X射线光电能谱分析表明(TiZrHf)50Ni30Cu14Co6合金的钝化膜主要由NiO和Cu2O等组成，能有效阻止Cl-对基体的进一步侵蚀，而Co(OH)2有助于提升膜层的致密性和吸附能力。
Abstract：(TiZrHf)50Ni30Cu20-xCox(x=2 at%, 4 at% and 6 at%) high-entropy shape memory alloys were prepared by water-cooled copper crucible magnetic levitation melting furnace and negative pressure copper mold suction casting method.Their corrosion performance in 3.5 mass% NaCl solution was tested using an electrochemical workstation. The results show that the(TiZrHf)50Ni30Cu20-xCox alloys are composed of B2 phase and B19′ phase. With the increase of Co content, the diffraction peak intensity of B2 phase increases gradually, and the mixing entropy of the alloys also increases. The alloys exhibit passivation behavior in 3.5 mass% NaCl solution. With the increase of Co content, the corrosion current density of the alloys decreases, while the pitting potential, capacitive arc radius and polarization resistance increase, and the number of pitting pits gradually decreases, indicating that the corrosion resistance of the alloys is improved. X-ray photoelectron spectroscopy analysis shows that the passivation film of the(TiZrHf)50Ni30Cu14Co6 alloy is mainly composed of NiO and Cu2O, which can effectively prevent the further erosion of Cl- to the matrix, while Co(OH)2 helps to improve the density and adsorption capacity of the film.
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基本信息:
DOI：10.13289/j.issn.1009-6264.2025-zt02
中图分类号:TG139.6;TG172
引用信息:
[1]于志琦,赵燕春,苏玉等.(TiZrHf)_(50)Ni_(30)Cu_(20-x)Co_x高熵形状记忆合金的腐蚀行为[J].材料热处理学报,2025,46(07):64-72.DOI:10.13289/j.issn.1009-6264.2025-zt02.
基金信息:
兰州市青年人才创新项目(2023-QN-91); 甘肃省科技计划(25CXGA077); 国家自然科学基金(12404230,52061027); 浙江省自然科学基金项目(LY23E010002)