Co1.5CrFeNi1.5 Mo0.5Ti0.5在不同pH值的3.5%NaCl酸性溶液中的钝化行为研究

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Abstract IIn order to study the passivation behavior of Co_1.5CrFeNi_1.5 Mo_0.5Ti_0.5 in 3.5% NaCl acid solution with different pH values. Cobalt (Co), chromium (Cr), titanium (Ti), iron (Fe) and nickel (Ni) with a purity of more than 99wt% were melted in a vacuum induction furnace. The microstructure of Co_1.5CrFeNi_1.5 Mo_0.5Ti_0.5 alloy was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS). The passivation behavior of Co_1.5CrFeNi_1.5 Mo_0.5Ti_0.5alloy in 3.5% NaCl acid solution with different pH values was studied by potentiodynamic polarization, electrochemical impedance spectroscopy, potentiostatic polarization and XPS analysis. The results show that the phase structure of Co_1.5CrFeNi_1.5 Mo_0.5Ti_0.5 is a single fcc structure, and its microstructure is dendrite structure; Co_1.5CrFeNi_1.5-Mo_0.5Ti_0.5 alloy has strong passivation ability in different pH 3.5% NaCl acid solution, and its corrosion resistance is enhanced with the increase of pH value; the composition of passivation film mainly includes Cr₂O₃, Cr(OH)₃, Co₃O₄, MoO₃, NiO, Fe₂O₃, Fe₃O₄, TiO₂.

Key words： high entropy alloy microstructure passive current density XPS passivation film

Published: 09 December 2021

CLC number:

TB31

Fund:This work was financially supported by the Youth Science Fund Project of National Natural Science Foundation of China(21908250).

About author:: Yongqiang Tian, engineer, master's degree, graduated from Xi'an Shiyou University in 2020, worked in Petro China Baoji Steel Pipe Co., Ltd. in the same year. He mainly engaged in oil well pipe research and development.

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	TIAN Yongqiang
	YUAN Qingying
	FU Anqing
	HE Shilei
	ZHOU Xinyi
	WANG Qiang
	YANG Xiaolong
	CHEN Haoming

Cite this article:

TIAN Yongqiang,YUAN Qingying,FU Anqing, et al. Passivation Behavior of Co_1.5CrFeNi_1.5Mo_0.5Ti_0.5 in 3.5% NaCl Solution with Different pH Values[J]. Materials Reports, 2021, 35(z2): 399-403.

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http://www.mater-rep.com/EN/ OR http://www.mater-rep.com/EN/Y2021/V35/Iz2/399

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