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Acta Metall Sin  2018, Vol. 54 Issue (6): 905-910    DOI: 10.11900/0412.1961.2017.00399
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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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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 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 words:  high-entropy alloy      CoCrFeNi      corrosion resistance      element content     
Received:  22 September 2017     
ZTFLH:  TG178  
Fund: Supported by National Key Research and Development Program of China (No.2016YFB0700300) and National Natural Science Foundation of China (Nos.51471133 and 51771149)

Cite this article: 

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.

URL: 

https://www.ams.org.cn/EN/10.11900/0412.1961.2017.00399     OR     https://www.ams.org.cn/EN/Y2018/V54/I6/905

Fig.1  Potentiodynamic polarization curves of CoaCr20FebNi80-a-b system in 3.5%NaCl solution (a) and the local magnification of Fig.1a (b)
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
Table 1  The electrochemical parameters of CoaCr20FebNi80-a-b system in 3.5%NaCl solution
Fig.2  Surface LSCM images corresponding to alloys 1~7 respectively (a~g) and three-dimensional image for Fig.2g (h) of CoaCr20FebNi80-a-b system after polarization in 3.5%NaCl solution
Fig.3  Nyquist plots with (a) and without (b) alloy 3 and Bode plot (c) of CoaCr20FebNi80-a-b system in 3.5%NaCl solution
Co content Alloy ip / (μAcm-2)
20% Co20Cr20Ni40Fe20 8.67
Co20Cr20Ni30Fe30 2.32
Co20Cr20Ni20Fe40 1.95
30% Co30Cr20Ni30Fe20 3.20
Co30Cr20Ni20Fe30 2.01
Table 2  Effect of Ni and Fe contents on the corrosion resistance of CoaCr20FebNi80-a-b with 20% and 30% Co condents
Fe content Alloy ip / (μAcm-2)
20% Co20Cr20Fe20Ni40 8.67
Co30Cr20Fe20Ni30 3.20
Co40Cr20Fe20Ni20 3.13
30% Co20Cr20Fe30Ni30 2.32
Co30Cr20Fe30Ni20 2.01
Table 3  Effect of Co and Ni contents on the corrosion resistance of CoaCr20FebNi80-a-b with 20% and 30% Fe contents
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