Anode Voltage on Hydrogen Permeation Barrier Performance of Zirconium Hydride with Micro-arc Oxidation

doi:10.15541/jim20170328

Abstract

Abstract:

Technology of micro-arc oxidation was applied on ZrH_1.8in the electrolyte composed of NaAlO₂+NaOH+ Na₂EDTA in constant voltage mode. The film was characterized by field emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD), and vacuum dehydrogenation experiment, respectively. The influences of anode voltage (350 to 425 V) on surface and cross-sectional morphology, structure, and hydrogen resistance properties of the hydrogen resistance film on the surface of ZrH_1.8 were investigated. The micro-arc oxidation process can be divided into four stages: anodic oxidation, spark discharge, micro-arc oxidation and flameout. The results reveal that film obtained in the electrolyte is composed of inner dense layer and outer loose layer, and proportion of the dense layer is about 80%. Grain sizes and growth rate of the film increase while the d-spacing decreases with the increase of the anode voltage, and the thickness of the film is increased from 122 to 150 μm. However, anode voltage has no obvious influence on the structure of the film. The prepared film is composed of M-ZrO₂ and T-ZrO₂. When the anode voltage is 400 V, the permeation reduction factor value reaches the maximum of 20.

Key words: zirconium hydride, micro-arc oxidation, anode voltage, hydrogen permeation barrier

CLC Number:

TQ174

ZHANG Peng-Fei, YAN Shu-Fang, CHEN Wei-Dong, LI Shi-Jiang, GENG Yan-Hua, Wang Hong-Xing. Anode Voltage on Hydrogen Permeation Barrier Performance of Zirconium Hydride with Micro-arc Oxidation[J]. Journal of Inorganic Materials, 2018, 33(7): 793-797.

Figures/Tables 7

Table 1 Experimental parameters of micro-arc oxidation

No.	Time/min	Anode voltage/V	Cathode voltage/V	Electrolyte composition
1	10	350	120	NaAlO₂ NaOH Na₂EDTA
2		375
3		400
4		425

Fig. 1 Anodic current-time responses during MAO process in NaAlO2 electrolyte

Fig. 2 XRD patterns of the MAO coatings on the surface of ZrH1.8 prepared at different anode voltages

Table 2 Grain size and d-spacing of MAO coatings on the surface of ZrH1.8 prepared at different anode voltages

Voltage/V	2θ/(°)	d-spacing/nm	FWHM/(°)	Grain size/nm
350	30.194	0.29575	0.314	27.7
375	30.214	0.29556	0.293	29.9
400	30.293	0.29480	0.286	30.8
425	30.332	0.29443	0.262	34.4

Fig. 3 Surface morphologies of oxide films prepared at different anode voltages(a) 350 V; (b) 375 V; (c) 400 V; (d) 425 V

Fig. 4 Cross-section morphologies of oxide films prepared at different anode voltages(a) 350 V; (b) 375 V; (c) 400 V; (d) 425 V and magnified image of selected area in (a) (e)

Fig. 5 Thickness, growth rate and permeation reduction factor of oxide films prepared at different anode voltages

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