Nb-Ti-Co氢分离合金的显微组织和耐腐蚀性能

doi:10.11896/cldb.20070265

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Abstract Nowadays, the traditional commercial hydrogen separation alloy Pd membrane resources are scarce and expensive, so it is urgent to deve-lop a new hydrogen separation alloy membrane. Nb-Ti-Co alloy can meet the above requirements well. Nevertheless, the mixed gases filtered by the alloy membranes are often mixed with a small amount of acid gases, such as CO₂,H₂S and HCl, which cause varying degrees of corrosion to the alloy membranes. So far, there have been few reports on the corrosion resistance of hydrogen separation alloy films, and the relationship between alloy microstructure and corrosion resistance has not been established. The microstructure and corrosion resistance of Nb-Ti-Co hydrogen separation alloy were studied in this paper. Firstly, the microstructure of the alloy was studied by means of SEM and XRD; secondly, the corrosion resistance of the alloy film was measured by a series of electrochemical experiments, and the variation of the film with the alloy composition and microstructure (or phase structure) was clarified; lastly, the change of the valence state of the surface elements after corrosion is analyzed by using XPS and other equipment, and their corrosion resistance mechanism is put forward. The results show that all the alloys except Nb₃₀Ti₃₅Co₃₅ are composed of primary α-Nb phase and eutectic phase (α-Nb+TiCo), and the volume fraction of the former increases with the increase of Nb content and Ti/Co ratio, and the latter decreases. Along with the above changes, the corrosion current of the alloy increases gradually, on the contrary, the corrosion voltage decreases gradually. The relationship between the above two and the integral number of the primary Nb phase is as follows, E_corr=-0.252 59-1.308 18×10^-4 e^V_bcc-Nb/-11.015 88 and I_corr=2.101 47+3.515 36×10^-5 e^V_bcc-Nb/-3.945 97.Moreover, this is due to the easy enrichment of Nb, Ti and Co elements on the alloy surface after corrosion and the formation of Nb₂O₅,TiO₂ and CoO oxide layers, accompanied by redox, hydrogen evolution and double decomposition reactions, which promote the further occurrence of corrosion. the above reaction process for the first time reveals the root cause of the relatively weak corrosion resistance of high Nb content alloys.

Key words： Nb-Ti-Co hydrogen separation alloy microstructure corrosion resistance

Published: 30 September 2021

CLC number:

TG139

Fund:This work was financially supported by National Natural Science Foundation of China (52161034, 51761009), Guangxi Natural Science Foundation Project(2020GXNSFAA159163), the Innovation Project of Guet Graduate Education (2019YCXS109), the Guangxi Key Laboratory of Information Laboratory (191021-Z).

About author:: Chongbo Di received his B.E. degree in material forming and control engineering from Guilin University of Electronic Technology in 2018. He is currently pursuing his M.E. at the school of Materials Science and Engineering, Guilin University of Electronic Technology under the supervision of Prof. Erhu Yan. His research has focused on new types of hydrogen permeably alloys/theory of solidification of multicomponent alloys.

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	DI Chongbo
	WANG Jinhua
	YAN Erhu
	WANG Xingyue
	CHEN Yuncan
	JIA Limin
	XU Fen
	SUN Lixian

Cite this article:

DI Chongbo,WANG Jinhua,YAN Erhu, et al. Microstructure and Corrosion Resistance of Nb-Ti-Co Hydrogen Separation Alloy[J]. Materials Reports, 2021, 35(18): 18109-18115.

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http://www.mater-rep.com/EN/10.11896/cldb.20070265 OR http://www.mater-rep.com/EN/Y2021/V35/I18/18109

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