TiO2-PTFE对6063铝合金微弧氧化膜层的影响

高虹; 王超; 姜波; 宋仁国

doi:10.16577/j.issn.1001-1560.2023.0144

材料保护 >

2023 , Vol. 56 >Issue 6: 128 - 136

DOI: https://doi.org/10.16577/j.issn.1001-1560.2023.0144

工艺探讨

TiO₂-PTFE对6063铝合金微弧氧化膜层的影响

高虹 ,
王超 ,
姜波 ,
宋仁国

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常州大学 a.材料科学与工程学院,b.江苏省材料表面科学与技术重点实验室,江苏常州 213164

宋仁国(1965-),教授,博士生导师,博士,主要研究方向为材料腐蚀与防护、表面工程、计算材料科学等,电话:0519-86330095,E-mail: songrg@cczu.edu.cn

收稿日期: 2022-12-21

修回日期: 2023-01-25

录用日期: 2023-02-14

网络出版日期: 2023-07-14

基金资助

国家自然科学基金资助项目(51871031)

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Effect of TiO₂-PTFE on Micro-Arc Oxidation Coating of 6063 Aluminum Alloy

GAO Hong ,
WANG Chao ,
JIANG Bo ,
SONG Ren-guo

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a. School of Materials Science and Engineering, b. Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou 213164, China

Received date: 2022-12-21

Revised date: 2023-01-25

Accepted date: 2023-02-14

Online published: 2023-07-14

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摘要

为了探究TiO₂和聚四氟乙烯(PTFE)对6063铝合金微弧氧化膜层的影响,在Na₂SiO₃基础电解液中添加TiO₂和PTFE固体纳米微粒,采用微弧氧化技术(MAO)在6063铝合金上制备了微弧氧化复合膜层。利用扫描电子显微镜(SEM)、X射线衍射(XRD)、摩擦磨损试验机以及电化学工作站研究了微弧氧化陶瓷膜层的形貌、相组成、元素分布以及耐磨性和耐蚀性。结果表明:加入4 g/L TiO₂和10 mg/L PTFE制成复合添加剂制备的复合膜层其表面孔径尺寸明显降低,膜层厚度增加,结构致密;摩擦系数由0.9降到0.5,耐磨性最好;电化学试验测得复合膜层的自腐蚀电位最大,为-0.18 V;自腐蚀电流密度最小,为1.09×10^-8 A/cm²。

关键词： 铝合金; 微弧氧化; 二氧化钛; 聚四氟乙烯; 耐磨性; 耐蚀性

本文引用格式

高虹 , 王超 , 姜波 , 宋仁国 . TiO₂-PTFE对6063铝合金微弧氧化膜层的影响[J]. 材料保护, 2023 , 56(6) : 128 -136 . DOI: 10.16577/j.issn.1001-1560.2023.0144

Abstract

In order to study the effect of TiO₂ and PTFE on micro-arc oxidation coating of 6063 aluminum alloy, TiO₂ and PTFE solid nanoparticles were added to the Na₂SiO₃ base electrolyte. The composite micro-arc oxidation coating was prepared on 6063 aluminum alloy by micro-arc oxidation (MAO) technology. The morphology, phase composition, element distribution, wear resistance and corrosion resistance of micro-arc oxidation ceramic coatings were studied by scanning electron microscope (SEM), X-ray diffraction (XRD), friction and wear tester and electrochemical workstation. Results indicated that the surface pore size of the composite coating prepared by adding 4 g/L TiO₂ and 10 mg/L PTFE as composite additives was significantly reduced, thickness of the coating increased and the structure became dense. The friction coefficient decreased from 0.9 to 0.5, resulting in the best wear resistance. The electrochemical test showed that the self-corrosion potential of the composite coating was the highest (-0.18 V), and the self-corrosion current density was minimum (1.09 × 10^-8 A/cm²).

Key words： aluminum alloy; micro-arc oxidation; TiO₂; PTFE; wear resistance; corrosion resistance

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