Corrosion Behavior of Medium Entropy CoCrNi-alloy in NH4Cl Solutions

doi:10.11902/1005.4537.2023.177

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (3): 725-734 DOI: 10.11902/1005.4537.2023.177

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Corrosion Behavior of Medium Entropy CoCrNi-alloy in NH₄Cl Solutions

ZHANG Chenglong¹^,², ZHANG Bin¹, ZHU Min¹(

), YUAN Yongfeng¹, GUO Shaoyi¹, YIN Simin¹

1. School of Mechanical Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China
2. Kyky Technology Co., Ltd., Beijing 100190, China

Cite this article:

ZHANG Chenglong, ZHANG Bin, ZHU Min, YUAN Yongfeng, GUO Shaoyi, YIN Simin. Corrosion Behavior of Medium Entropy CoCrNi-alloy in NH₄Cl Solutions. Journal of Chinese Society for Corrosion and protection, 2024, 44(3): 725-734.

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Abstract

The corrosion behavior and mechanism of medium entropy equiatomic CoCrNi alloy (MEA) in various NH₄Cl solutions (i.e., with 1%, 3% and 8% NH₄Cl) were systematically studied by electrochemical test, statistical analysis, and immersion corrosion test. The results show that with the increase of NH₄Cl concentration, the corrosion potential (E_corr) of the MEA shifts negatively, the passive current density (I_p) increases, and the corrosion rate rises, indicating that the corrosion resistance of the alloy decreases. When the concentrations of NH₄Cl solution are 3% and 8%, the anodic polarization curve displays a clear active-passive transition zone, which means that the passivity of the MEA is reduced. In addition, as NH₄Cl concentration increases, the defect density within the passivation film on the MEA increases significantly, the thickness of the film decreases, and its stability declines, which weakens the protection ability of the film. The combined effect between NH₄⁺ and Cl^- promotes the nucleation and development of metastable pitting corrosion, while in the high concentration of NH₄Cl solution, the metastable pits are difficult to be re-passivated, and easy to develop into steady pits. In general, the main corrosion form of the MEA is pitting corrosion.

Key words: MEA corrosion behavior metastable pitting corrosion passive film

Received: 26 May 2023 32134.14.1005.4537.2023.177

ZTFLH:

TG178

Fund: Natural Science Foundation of Zhejiang Province(LY18E010004);Fundamental Research Funds of Zhejiang Sci-Tech University(22242293-Y)

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

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	ZHANG Chenglong
	ZHANG Bin
	ZHU Min
	YUAN Yongfeng
	GUO Shaoyi
	YIN Simin

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.177 OR https://www.jcscp.org/EN/Y2024/V44/I3/725

Fig.1 Microstructure of CoCrNi MEA

Fig.2 OCP of the MEA in NH₄Cl solutions with different concentrations

Fig.3 Potentiodynamic polarization curves of the MEA in NH₄Cl solutions with different concentrations

Table 1 Fitting results of potentiodynamic polarization curves

Fig.4 Nyquist (a) and Bode (b, c) plots of the MEA in NH₄Cl solutions, and equivalent circuit for fitting EIS data (d)

Table 2 Fitting results of the EIS data

Fig.5 R_f and R_ct values of the MEA in NH₄Cl solutions

Fig.6 Mott-Schottky plots (a), carrier densities (b) and thickness (c) of the passive films formed on the MEA in NH₄Cl solutions

Fig.7 Cyclic-polarization curves (a) and hysteresis ring areas (b) of the MEA in NH₄Cl solutions

Fig.8 Current-time transient curves of the MEA in the solutions containing 1% (a), 3% (b) and 8% (c) NH₄Cl

Fig.9 Single peak (a) and overlapped peak (b) of metastable pitting of the MEA

Fig.10 Average pit number density (a), peak value of current transient (b) and lifetime of metastable pitting (c) of the MEA in NH₄Cl solutions

Fig.11 Metastable pitting morphology of the MEA immersed in 8% NH₄Cl solution

Fig.12 Average corrosion rates of the MEA in NH₄Cl solutions with different concentrations

Fig.13 Corrosion morphologies of the MEA immersed for 5 d in the solutions containing 1% (a1, a2), 3% (b1, b2) and 8% (c1, c2) NH₄Cl

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