无金属粘结相TiCN基金属陶瓷在NaOH溶液中的电化学腐蚀行为

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Abstract Four binderless TiCN-based cermets TiC_0.4N_0.6, TiC_0.7N_0.3, TiC_0.7N_0.3-29WC-12TaC and TiC_0.7N_0.3-29WC- 12TaC-2Mo₂C with a relative density greater than 98.5% were prepared by spark plasma sintering (SPS). Scanning electron microscopy SEM observation shows that the average grain size of binderless TiC_0.4N_0.6 is substantially larger than that of other three groups. Electrochemical corrosion behaviors of binderless TiCN-based cermets in 0.1 mol/L NaOH solution were investigated by potentiodynamic polarization curve and electrochemical impedance spectroscopy. The results show that the corrosion resistance of the cermets in NaOH solution follows the following order, i.e., TiC_0.7N_0.3>TiC_0.7N_0.3- 29WC-12TaC>TiC_0.7N_0.3-29WC-12TaC-2Mo₂C>TiC_0.4N_0.6. The increase of nitrogen and the addition of metal carbides are detrimental to the corrosion resistance of cermets. The oxidation product formed during the corrosion process can act as a passivation film, which results in a pseudo-passivation phenomenon. Binderless TiC_0.7N_0.3 cermet has the highest relative densification (99.5%) and the best corrosion resistance.

Key words： spark plasma sintering binderless TiCN cermet electrochemical corrosion pseudo passivation

Received: 16 October 2018 Published: 12 July 2019

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	XIAO Qiaoping
	ZHANG Li
	LUO Guokai
	CUI Yanming
	WU Houping
	HUANG Long

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XIAO Qiaoping,ZHANG Li,LUO Guokai, et al. Electrochemical corrosion behavior of binderless TiCN-based cermets in NaOH solution[J]. Materials Science and Engineering of Powder Metallurgy, 2019, 24(2): 120-128.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2019/V24/I2/120

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