TA2微弧氧化疏松层的电化学剥落及耐腐蚀性能

杨祎璠, 高建平, 王星, 范瑞君

doi:10.16577/j.issn.1001-1560.2025.0088

材料保护 >

2025 , Vol. 58 >Issue 5: 161 - 167

DOI: https://doi.org/10.16577/j.issn.1001-1560.2025.0088

研究论文

TA2微弧氧化疏松层的电化学剥落及耐腐蚀性能

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西部金属材料股份有限公司

高建平(1991－)，博士，主要研究方向为氢能关键材料制备及性能调控，E-mail:gjp＿nwpu＠163.com

收稿日期: 2024-09-27

修回日期: 2024-11-22

录用日期: 2024-11-24

网络出版日期: 2025-06-10

基金资助

中央引导地方科技发展专项资金项目(ZYYD2025QY13)；秦创原引用高层次创新创业人才项目(QCYRCXM-2022-199)

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Study on the Electrochemical Delamination and Corrosion Resistance of the Loose Layer Formed by Micro-Arc Oxidation on TA2 Titanium Alloy

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(Western Metal Materials Co.， Ltd.， Xi’an 710201， China)

GAO Jianping (1991－)， Ph.D.， Research Focus: Preparation and Property Regulation of Hydrogen Energy Key Materials，E-mail:gjp＿nwpu＠163.com

Received date: 2024-09-27

Revised date: 2024-11-22

Accepted date: 2024-11-24

Online published: 2025-06-10

Supported by

Central Guiding Local Science and Technology Development Foundation of China (ZYYD2025QY13)； Qin Chuangyuan Cited the High-Level Innovative and Entrepreneurial Talent Program (QCYRCXM-2022-199)

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摘要

针对传统钛合金微弧氧化涂层外表层疏松多孔、易在腐蚀环境下发生剥落失效的问题，采用电化学腐蚀剥落的方法在ClH4NO 腐蚀溶液体系中，通过调控腐蚀电压及剥落时间，对TA2 微弧氧化涂层的表面疏松层实现可控剥落，探讨了疏松层剥落前后涂层的物相组成、微观形貌、膜层厚度的变化以及对耐腐蚀性能的影响。结果表明，电化学腐蚀剥落疏松层后，获得的致密涂层厚度约为剥落前涂层的1/2，主要成分为TiO2和Ti2O3，其表面呈凹坑状腐蚀形貌，且没有明显裂纹及贯穿孔隙。随着剥落电压以及剥落时间的延长，疏松层的剥落深度均增大，其中剥落电压对剥落效果的影响最为明显。电化学腐蚀剥落工艺在保留致密层涂层内部结构的同时通过改变涂层的表面形貌提升了其耐腐蚀性能，致密涂层的自腐蚀电流密度较剥落前最多降低了2 个数量级，最低达到4.819×10－9 A/cm2，微弧氧化疏松层的剥落减少了腐蚀失效位点，使涂层的耐腐蚀性能大幅度提高。

关键词： 微弧氧化涂层; 疏松层; 电化学腐蚀剥落; 耐腐蚀性能; 纯钛TA2

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杨祎璠, 高建平, 王星, 范瑞君 . TA2微弧氧化疏松层的电化学剥落及耐腐蚀性能[J]. 材料保护, 2025 , 58(5) : 161 -167 . DOI: 10.16577/j.issn.1001-1560.2025.0088

Abstract

In order to address the issue of spalling failure of the loose outer layer of conventional titanium alloy micro-arc oxidation (MAO)coatings to delaminate in corrosive environments，a controllable electrochemical-corrosion delamination process was implemented in an ClH4NO solution.By regulating the corrosion voltage and spalling time， the loose layer of a TA2 MAO coating was selectively removed， and the phase composition， micromorphology， film thickness and corrosion resistance of the coating were examined before and after peeling of the loose layer.Results showed that the thickness of the dense coating obtained after the loose layer was peeled off by electrochemical corrosion was about 1/2 of that of the coating before peeling.The dense coating primarily composed of TiO2 and Ti2O3.Its surface displayed a pit-like corrosion morphology without discernible cracks or through-pores.Both the peeling depth and the degree of porous-layer removal increased with rising voltage and extended peeling time， with voltage exerting the greater influence.This electrochemical corrosion peeling process retained the internal structure of the dense layer while modifying its surface topography，thereby enhancing its corrosion resistance.The self-corrosion current density of the dense layer was reduced by up to two orders of magnitude， reaching a minimum of 4.819×10－9 A/cm2.Removal of the loose MAO layer eliminated numerous corrosion-failure sites and markedly improved the overall anti-corrosive performance of the coating.

Key words： MAO coating; loose layer; electrochemical exfoliation; corrosion resistance; TA2

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