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

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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

7 Scopus Citations
View graph of relations

Author(s)

  • 杨海欧
  • 尚旭亮
  • 王理林
  • 王锦程
  • 林 鑫

Detail(s)

Original languageChinese (Simplified)
Pages (from-to)905-910
Journal / PublicationJinshu Xuebao/Acta Metallurgica Sinica
Volume54
Issue number6
Online published30 Jan 2018
Publication statusPublished - 10 Jun 2018
Externally publishedYes

Abstract

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。
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.

Research Area(s)

  • 高熵合金, CoCrFeNi, 耐蚀性能, 元素含量, high-entropy alloy, corrosion resistance, element content

Citation Format(s)

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; 尚旭亮; 王理林; 王志军; 王锦程; 林 鑫.

In: Jinshu Xuebao/Acta Metallurgica Sinica, Vol. 54, No. 6, 10.06.2018, p. 905-910.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review