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四硼酸锂电解液浓度对Zr-4合金微弧氧化陶瓷层的影响

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  • (1.西南交通大学材料科学与工程学院, 四川 成都 610031; 2.核工业西南物理研究院, 四川 成都 610041;3.西南交通大学电气学院 磁浮技术与磁浮列车教育部重点实验室, 四川 成都 610031)
张 勇(1969-),研究员,博士,主要研究方向为Nb3Al 超导材料的制备及性能研究,电话:13084409681, E-mail:yongzhang@swjtu.edu.cn

收稿日期: 2023-03-24

  修回日期: 2023-04-15

  录用日期: 2023-05-20

  网络出版日期: 2023-09-15

基金资助

国家重点研发计划(2022YFE03020002)资助

Effect of Concentration of Lithium Tetraborate Electrolyte on the Micro-Arc Oxidation Ceramic Layer on Zr-4 Alloy

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  • (1.School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China;2.Southwest Institute of Physics, Chengdu 610041, China;3.Key Laboratory of Magnetic Suspension Technology and Maglev Vehicle, Ministry of Education, School of Electrical Engineering,Southwest Jiaotong University, Chengdu 610031, China)

Received date: 2023-03-24

  Revised date: 2023-04-15

  Accepted date: 2023-05-20

  Online published: 2023-09-15

摘要

为了提高Zr-4 合金在核工业中的服役性能并避免引入杂质元素,以Li2B4O7 为电解液在Zr-4 合金表面制备微弧氧化陶瓷层,研究了Li2B4O7 浓度对微弧氧化陶瓷层的物相组成、微观形貌、膜层厚度、硬度、粗糙度、耐磨损和耐腐蚀性能的影响。 结果表明:当ρ(Li2B4O7)=3~15 g/L 时,随着Li2B4O7 浓度的增加,电解液的电导率持续增加,陶瓷层的粗糙度总体持续增加,只在电解液浓度从6 g/L 变化到9 g/L 时稍有下降,微弧氧化陶瓷层厚度先在ρ(Li2B4O7)=3~9 g/L 范围内持续下降,后在ρ(Li2B4O7)=9 ~15 g/L 范围内上升;陶瓷层的硬度先是在ρ(Li2B4O7)=3~6 g/L 范围内下降,后在ρ(Li2B4O7)=6 ~15 g/L 范围内上升。 陶瓷层全部由单斜相氧化锆(m-ZrO2)构成。 随着电解液中Li2B4O7 浓度的增加,陶瓷层的孔隙率下降,微孔尺寸变化不大,陶瓷层的摩擦系数在ρ(Li2B4O7)=3~12 g/L 范围内持续增加,在ρ(Li2B4O7)=15 g/L 时下降。 综合比较,在Li2B4O7 浓度为15 g/L 的电解液中可以获得厚度适中、硬度较好、表面平整连续、孔隙率和孔径尺寸均较小、耐磨损和耐腐蚀性能均较好的陶瓷层。

本文引用格式

黄佳俊, 金凡亚, 胡俊达, 刘昊, 黄熠, 但敏, 万俊豪, 唐国庆, 张勇 . 四硼酸锂电解液浓度对Zr-4合金微弧氧化陶瓷层的影响[J]. 材料保护, 2023 , 56(9) : 68 -74 . DOI: 10.16577/j.issn.1001-1560.2023.0214

Abstract

In order to improve the service performance of Zr-4 alloy in nuclear industry and avoid introducing impurity elements, the micro-arc oxidation ceramic layer was prepared on the surface of Zr-4 alloy with Li2B4O7 as electrolyte.The effects of lithium tetraborate concentration on phase composition, microstructure, film thickness, hardness, roughness, wear resistance and corrosion resistance of micro-arc oxidation ceramic layer were investigated.Results showed that as the concentration of Li2B4O7 increased in the range of ρ(Li2B4O7)=3~15 g/L, the conductivity of the electrolyte continued to increase, and the roughness of the ceramic layer continued to increase overall, which only slightly decreased when the electrolyte concentration changed from 6 g/L to 9 g/L.The thickness of micro-arc oxidation ceramic layer first continuously decreased in the range of ρ(Li2B4O7)=3~9 g/L and then increased in the range of ρ(Li2B4O7)=9~15 g/L.The hardness of the ceramic layer first decreased in the range of ρ(Li2B4O7)=3 ~6 g/L, and then increased in the range of ρ(Li2B4O7)=6 ~15 g/L.In addition, the ceramic layers were all composed of monoclinic zirconia (m-ZrO2).As the concentration of Li2B4O7 in the electrolyte increased, the porosity of the ceramic layer decreased and the micropore size changed little.The friction coefficient of the ceramic layer increased continuously in the range of ρ(Li2B4O7)=3~12 g/L, and decreased when ρ(Li2B4O7)=15 g/L.By comprehensive comparison, the ceramic layer with moderate thickness, good hardness, smooth and continuous surface, small porosity and pore size, good wear resistance and corrosion resistance could be obtained in the electrolyte with ρ(Li2B4O7) = 15 g/L.

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