单相CoCrFeNi高熵合金的组成元素对其在NaCl溶液中的耐蚀性能的影响

doi:10.11900/0412.1961.2017.00399

金属学报

2018, Vol. 54

Issue (6): 905-910 DOI: 10.11900/0412.1961.2017.00399

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单相CoCrFeNi高熵合金的组成元素对其在NaCl溶液中的耐蚀性能的影响

杨海欧¹, 尚旭亮¹, 王理林², 王志军¹(

), 王锦程¹, 林鑫¹

1 西北工业大学凝固技术国家重点实验室西安 710072
2 西安理工大学材料科学与工程学院西安 710048

Effect of Constituent Elements on the Corrosion Resistance of Single-Phase CoCrFeNi High-Entropy Alloys in NaCl Solution

Haiou YANG¹, Xuliang SHANG¹, Lilin WANG², Zhijun WANG¹(

), Jincheng WANG¹, Xin LIN¹

1 State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
2 School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China

引用本文:

杨海欧, 尚旭亮, 王理林, 王志军, 王锦程, 林鑫. 单相CoCrFeNi高熵合金的组成元素对其在NaCl溶液中的耐蚀性能的影响[J]. 金属学报, 2018, 54(6): 905-910.
Haiou YANG, Xuliang SHANG, Lilin WANG, Zhijun WANG, Jincheng WANG, Xin LIN. Effect of Constituent Elements on the Corrosion Resistance of Single-Phase CoCrFeNi High-Entropy Alloys in NaCl Solution[J]. Acta Metall Sin, 2018, 54(6): 905-910.

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摘要:

采用LSCM、EIS和动电位极化曲线等测试手段研究了Co、Fe以及Ni对CoCrFeNi单相高熵合金体系在3.5%NaCl (质量分数)溶液中耐蚀性能的影响。结果表明,当Co、Cr含量相同时,增加Fe含量的同时减少Ni含量,能够降低该合金体系的维钝电流密度;当Fe、Cr含量相同时,增加Co含量的同时减少Ni含量,也能够降低该合金体系的维钝电流密度,从而提高其耐蚀性;当Cr含量相同时,减少Co含量,同时增加Fe和Ni的含量,能够提高合金的自腐蚀电位,降低合金发生腐蚀的倾向。

关键词 ：高熵合金, CoCrFeNi, 耐蚀性能, 元素含量

Abstract：

High entropy alloys (HEAs) origin from a new alloy design concept with multi-principal elements, which have attracted significant interests in the past decade. The high configurational entropy in HEAs results in simple solid solutions with fcc and bcc structures. Especially, the single solid solution CoCrFeNi alloy exhibits excellent properties in many aspects, such as mechanical properties, thermal stability, radiation resistance and corrosion resistance. The excellent corrosion resistance of CoCrFeNi alloy is ascribed to the single-phase structure and uniform element distribution coupled with much higher Cr content than stainless steel. The single-phase structure and uniform element distribution can prevent the occurrence of localized corrosion, and higher Cr content can protect the alloy surface better with the form of oxidation film. Moreover, the corrosion resistance of CoCrFeNi-based HEAs, such as CoCrFeNiAl_x, CoCrFeNiCu_x, CoCrFeNiTi_x, have also been extensively investigated. In most CoCrFeNi-based HEAs, the elements of Co, Cr, Fe and Ni are with equal-atomic ratio. However, the equal-atomic ratio is not necessary to obtain satisfactory properties and to ensure the single fcc structure in Co-Cr-Fe-Ni system. Accordingly, it is essential to further consider the effect of alloying elements on the corrosion resistance in Co-Cr-Fe-Ni HEA. In this work, the effect of Co, Fe and Ni elements on the corrosion resistance of single fcc Co-Cr-Fe-Ni system with concentrated constitution but different atomic ratios in 3.5%NaCl solution are investigated by using LSCM and EIS. The potentiodynamic polarization results indicate that the increase of Fe and the decrease of Ni will decrease the passivation current density of the alloys when the Co and Cr contents are equal. With the increase of Co and the decrease of Ni, the alloys show smaller passivation current density and better corrosion resistance when the Fe and Cr contents are equal. With the decrease of Co and the increase of Fe and Ni, the alloys show higher corrosion potential and smaller corrosion tendency when the Cr content is constant. These results will be helpful for the design of corrosion resistant HEAs in NaCl aqueous solution.

Key words： high-entropy alloy CoCrFeNi corrosion resistance element content

收稿日期: 2017-09-22

ZTFLH:

TG178

基金资助:国家重点研发计划项目No.2016YFB0700300及国家自然科学基金项目Nos.51471133和51771149

作者简介:

作者简介杨海欧,男,1976年生,博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2017.00399 或 https://www.ams.org.cn/CN/Y2018/V54/I6/905

图1 CoaCr20FebNi80-a-b体系在3.5%NaCl溶液中的动电位极化曲线

表1 CoaCr20FebNi80-a-b体系在3.5%NaCl溶液中的电化学参数

图2 CoaCr20FebNi80-a-b体系在3.5%NaCl溶液中动电位极化后表面腐蚀的LSCM像及三维形貌

图3 CoaCr20FebNi80-a-b体系在3.5%NaCl溶液中的EIS

表2 Co含量为20%和30%时,Ni和Fe含量对CoaCr20FebNi80-a-b体系耐蚀性能的影响

表3 Fe含量为20%和30%时,Co和Ni含量变化对CoaCr20FebNi80-a-b体系耐蚀性能的影响

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