Graphene Concentration on Micro-arc Oxidation Ceramic Layer of ZrH1.8 Surface

doi:10.15541/jim20190037

Abstract

Abstract:

The surface of ZrH_1.8 was subjected to micro-arc oxidation treatment in a constant pressure mode using graphene as an additive in Na₅P₃O₁₀-KOH-Na₂EDTA electrolyte. Adhesion of the ceramic layer to the substrate was tested using a coating scratch tester. Hydrogen barrier property of the ceramic layer were evaluated by vacuum dehydrogenation experiments. After adding graphene to the electrolyte, the micro-arc oxidation ceramic layer on the ZrH_1.8 surface is composed of an inner dense layer and a loose outer layer. XRD pattern shows that the ceramic layer is mainly composed of M-ZrO₂ and T-ZrO₂ phases. As the concentration of graphene increases, the permeation reduction factor (PRF) of the ceramic layer increases firstly and then decreases. When the concentration of graphene is 0.10 g/L, the thickness of the ceramic layer is about 66.5 μm, with less surface pores and cracks, denser ceramic layer, PRF at 13.2, and better hydrogen barrier performance.

Key words: zirconium hydride, micro-arc oxidation, graphene, ceramic layer, hydrogen barrier performance

CLC Number:

TG174

DU Pei, YAN Shu-Fang, CHEN Wei-Dong, LI Shi-Jiang, MA Wen. Graphene Concentration on Micro-arc Oxidation Ceramic Layer of ZrH_1.8 Surface[J]. Journal of Inorganic Materials, 2019, 34(11): 1175-1180.

Figures/Tables 8

Table 1 Electrolyte composition and micro-arc oxidation experimental parameters

Graphene concentration/(g·L^-1)	Anode voltage/V	Cathode voltage/V	Frequency/Hz	Duty cycle	Time/min	Electrolyte composition
0	430	150	150	50	15	Na₅P₃O₁₀ KOH Na₂EDTA
0.05
0.10
0.15
0.20

Fig. 1 Surface morphologies of micro-arc oxidation ceramic layer at different graphene concentrations (a) Without graphene; (b) 0.05 g/L; (c) 0.10 g/L; (d) 0.15 g/L; (e) 0.20 g/L

Fig. 2 Cross-section morphologies of micro-arc oxidation ceramic layer at different graphene concentrations (a) Without graphene; (b) 0.05 g/L; (c) 0.10 g/L; (d) 0.15 g/L; (e) 0.20 g/L

Fig. 3 XRD patterns of micro-arc oxidation ceramic layer at different graphene concentrations (a) Without graphene; (b) 0.05 g/L; (c) 0.10 g/L; (d) 0.15 g/L; (e) 0.20 g/L

Fig. 4 XPS spectra of micro-arc oxidation ceramic layer at different graphene concentrations (a) Without graphene; (b) 0.10 g/L

Fig. 5 XPS high resolution spectra of elements detected in Fig. 4(b) (a) C; (b) O; (c) Zr

Fig. 6 Bonding force between micro-arc oxidation ceramic layer and ZrH1.8 matrix at different graphene concentrations

Fig. 7 PRF value of micro-arc oxidation ceramic layer at different graphene concentrations

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