Comparison of Corrosion Resistance of CoCrFeMnNi High Entropy Alloys with Pipeline Steels in an Artificial Alkaline Soil Solution

doi:10.11902/1005.4537.2021.161

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (3): 425-434 DOI: 10.11902/1005.4537.2021.161

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Comparison of Corrosion Resistance of CoCrFeMnNi High Entropy Alloys with Pipeline Steels in an Artificial Alkaline Soil Solution

ZHAO Baozhu, ZHU Min(

), YUAN Yongfeng, GUO Shaoyi, YIN Simin

School of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou 310018, China

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Abstract

The difference in the corrosion resistance between the as-cast and heat treated equiatomic CoCrFeMnNi high entropy alloy (HEA) and hot rolled X80 and X100 pipeline steels in a simulated alkaline soil solution was investigated by immersion test, electrochemical tests, XPS and AFM. The results show that the high entropy alloy exhibits the characteristics of local corrosion, and few pits are sporadically distributed on its surface, while X80 and X100 pipeline steels display the characteristics of severe general corrosion, with large size corrosion pits. Moreover, the passive film of HEA is compact and stable, and contains more Cr oxide, bound water and less FeO, which is conducive to increasing its corrosion resistance, whereas the passive film of pipeline steel is thinner and defective, and has poor protective ability. The corrosion resistance of the HEA before and after heat treatment is all better than those of X80 and X100 pipeline steels, and the corrosion resistance of the HEA can be further improved by heat treatment.

Key words: HEA pipeline steel corrosion resistance pitting corrosion passive film

Received: 13 July 2021

ZTFLH:

TG142

Fund: Natural Science Foundation of Zhejiang Province of China(LY18E010004);Science and Technology Plan Projects of State Administration for Market Regulation(2019MK134)

Corresponding Authors: ZHU Min E-mail: zmii2009@163.com

About author: ZHU Min, E-mail: zmii2009@163.com

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	Baozhu ZHAO
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Cite this article:

ZHAO Baozhu, ZHU Min, YUAN Yongfeng, GUO Shaoyi, YIN Simin. Comparison of Corrosion Resistance of CoCrFeMnNi High Entropy Alloys with Pipeline Steels in an Artificial Alkaline Soil Solution. Journal of Chinese Society for Corrosion and protection, 2022, 42(3): 425-434.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2021.161 OR https://www.jcscp.org/EN/Y2022/V42/I3/425

Fig.1 Microstructures of as-cast HEA (a), heat-treated HEA (b), X80 steel (c) and X100 steel (d)

Fig.2 XRD image of as-cast HEA and heat-treated HEA

Fig.3 Open circuit potential of HEA and pipeline steels in Na₂CO₃/NaHCO₃ solution

Fig.4 Potentiodynamic polarization curves (a), I_p and E_corr (b) of HEA and pipeline steels in Na₂CO₃/NaHCO₃ solution

Fig.5 Nyquist (a) and Bode (b, c) plots of HEA and pipeline steels in alkaline soil simulation solution

Fig.6 Equivalent circuit for fitting EIS data

Table 1 Fitted electrochemical parameters for EIS diagrams of HEA and pipeline steels

Fig.7 Mott-Schottky plots (a), carrier densities (b) and thickness (c) of passive films on HEA and pipeline steels in alkaline soil simulation solution

Fig.8 2D (a1~c1) and 3D (a2~c2) morphologies and transversal plots (a3~c3) of passive films on heat-treated HEA (a), X80 steel (b) and X100 steel (c)

Fig.9 XPS spectra of passive films on as-cast HEA and heat-treated HEA: (a) Co 2p_3/2, (b) Cr 2p_3/2, (c) Fe 2p_3/2, (d) Mn 2p_3/2, (e) Ni 2p_3/2, (f) O 1s

Fig.10 Composition ratio of passive films on as-cast HEA and heat-treated HEA

Fig.11 Corrosion morphologies of as-cast HEA soaked for 14 d (a, b), heat-treated HEA soaked for 14 d (c, d), X80 steel soaked for 7 d (e, f), X80 steel soaked for 14 d (g, h) and X100 steel soaked for 14 d (i, j) in alkaline soil simulation solution

Fig.12 Average corrosion rates of HEA and pipeline steels in alkaline soil simulated solution

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