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金属学报  2018, Vol. 54 Issue (6): 905-910    DOI: 10.11900/0412.1961.2017.00399
  本期目录 | 过刊浏览 |
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
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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    

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 CoCrFeNiAlx, CoCrFeNiCux, CoCrFeNiTix, 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 wordshigh-entropy alloy    CoCrFeNi    corrosion resistance    element content
收稿日期: 2017-09-22     
ZTFLH:  TG178  

作者简介 杨海欧,男,1976年生,博士


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. Acta Metall Sin, 2018, 54(6): 905-910.

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图1  CoaCr20FebNi80-a-b体系在3.5%NaCl溶液中的动电位极化曲线
No. Alloy Eb / mV ip / (μAcm-2) Ecorr / mV icorr / (μAcm-2)
1 Co20Cr20Fe20Ni40 998 8.67 19 0.50
2 Co20Cr20Fe30Ni30 992 2.32 113 1.65
3 Co20Cr20Fe40Ni20 1009 1.95 -76 0.03
4 Co26.67Cr20Fe26.67Ni26.66 952 4.72 77 1.78
5 Co30Cr20Fe20Ni30 980 3.20 72 2.22
6 Co30Cr20Fe30Ni20 970 2.01 12 2.32
7 Co40Cr20Fe20Ni20 987 3.13 33 0.61
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
Co content Alloy ip / (μAcm-2)
20% Co20Cr20Ni40Fe20 8.67
Co20Cr20Ni30Fe30 2.32
Co20Cr20Ni20Fe40 1.95
30% Co30Cr20Ni30Fe20 3.20
Co30Cr20Ni20Fe30 2.01
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
Fe content Alloy ip / (μAcm-2)
20% Co20Cr20Fe20Ni40 8.67
Co30Cr20Fe20Ni30 3.20
Co40Cr20Fe20Ni20 3.13
30% Co20Cr20Fe30Ni30 2.32
Co30Cr20Fe30Ni20 2.01
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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