2A97铝锂合金典型防护涂层热带海洋大气环境腐蚀老化行为

doi:10.11902/1005.4537.2022.277

中国腐蚀与防护学报

2023, Vol. 43

Issue (1): 143-151 CSTR: 32134.14.1005.4537.2022.277 DOI: 10.11902/1005.4537.2022.277

研究报告

本期目录 | 过刊浏览

2A97铝锂合金典型防护涂层热带海洋大气环境腐蚀老化行为

贾静焕¹, 刘明¹(

), 骆晨¹, 孙志华¹, 赵明亮¹, 李晓刚²

1 中国航发北京航空材料研究院中国航空发动机集团航空材料先进腐蚀与防护重点实验室北京 100095
2 北京科技大学新材料技术研究院北京 100083

Corrosion and Aging Behavior of 2A97 Al-Li Alloy with Typical Protective Coatings in Tropical Marine Atmosphere Environment

JIA Jinghuan¹, LIU Ming¹(

), LUO Chen¹, SUN Zhihua¹, ZHAO Mingliang¹, LI Xiaogang²

1 AECC Key Laboratory of Advanced Corrosion and Protection of Aeronautical Materials, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China
2 Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China

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摘要:

将2A97铝锂合金典型防护涂层在万宁自然环境试验站进行户外暴露，并采用表面及截面形貌观察、红外光谱、电化学阻抗谱等方法，研究2A97铝锂合金涂层试样在热带海洋大气环境下的腐蚀老化行为规律及机理。结果表明：包含底漆+面漆的涂层1在暴露2.5 a内，表面有微孔洞形成，涂层和阳极氧化层较为完整，合金基体未腐蚀；只有底漆的涂层2在暴露1 a时，涂层形成大量微裂纹，并且局部区域发生剥落，且随暴露时间延长，阳极氧化层减薄，合金基体遭受腐蚀。与只有底漆的单涂层相比，底漆+面漆双层涂层具有较低的失光率和色差，抗老化性能更优异。涂层1暴露不同周期后，均表现为一个容抗弧，其腐蚀老化进程主要由水和氧的扩散速率控制。涂层2暴露1 a后，电解质侵入到涂层/基体界面处，基体发生腐蚀反应，随暴露时间延长，涂层开始剥落，主要表现为铝锂合金基体的腐蚀，其腐蚀老化速率主要由电化学过程控制。

关键词 ： 2A97铝锂合金, 防护涂层, 热带海洋大气, 腐蚀, 老化

Abstract：

Two typical protective coatings applied on 2A97 Al-Li alloy were exposed in Wanning natural environment test station in Hainan island, and their corrosion and aging behavior were studied by means of surface and cross section morphology observation, infrared spectroscopy, electrochemical impedance spectroscopy and other methods. The 2A97 Al-Li alloy was firstly subjected to anodic oxidation treatment, then applying either two layer coating of primer+topcoat (coating 1) or mono layered coating of only primer (coating 2). The results show that after 2.5 a exposure, the coating 1 keeps intact i.e. the coating and anodized layer are relatively complete, and the alloy matrix is not corroded. In the contrast, a large number of micro cracks emerge in coating 2 after 1 a exposure, and even spallation can be observed in some local areas of the coating, meanwhile, the anodic oxidation layer becomes thinner and the alloy matrix suffers from corrosion with the extension of exposure time. Compared with the coating 2, the coating 1 has better aging resistance, showing lower rate of light loss and chromatic aberration. The impedance spectrum of coating 1 consists of a capacitive reactance arc after different periods of exposure, which means that the corrosion process of coating 1 is mainly controlled by the inward diffusion of water and oxygen. While the electrolyte invades the interface between coating 2 and the matrix after 1 a exposure, and the coating begins to peel off with the extension of exposure time, which is mainly manifested as the corrosion of Al-Li alloy matrix, and the corrosion rate is controlled by the electrochemical process.

Key words： 2A97 Al-Li alloy protective coating tropical Marine atmosphere corrosion aging

收稿日期: 2022-09-08 32134.14.1005.4537.2022.277

ZTFLH:

TG172

基金资助:国防科技工业技术基础“十三五”科研项目(KH61180524)

通讯作者: 刘明，E-mail：luminousa@126.com，研究方向为材料腐蚀评价

Corresponding author: LIU Ming, E-mail: luminousa@126.com

作者简介: 贾静焕，女，1989年生，博士，工程师

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引用本文:

贾静焕, 刘明, 骆晨, 孙志华, 赵明亮, 李晓刚. 2A97铝锂合金典型防护涂层热带海洋大气环境腐蚀老化行为[J]. 中国腐蚀与防护学报, 2023, 43(1): 143-151.
JIA Jinghuan, LIU Ming, LUO Chen, SUN Zhihua, ZHAO Mingliang, LI Xiaogang. Corrosion and Aging Behavior of 2A97 Al-Li Alloy with Typical Protective Coatings in Tropical Marine Atmosphere Environment. Journal of Chinese Society for Corrosion and protection, 2023, 43(1): 143-151.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.277 或 https://www.jcscp.org/CN/Y2023/V43/I1/143

图1 涂层1和涂层2试样万宁自然环境试验站暴晒不同周期后的宏观形貌

图2 涂层1和涂层2试样万宁自然环境试验站暴晒不同周期后的表面微观形貌

图3 涂层1试样万宁自然环境试验站暴晒不同周期后的截面形貌

图4 涂层2试样万宁自然环境试验站暴晒不同周期后的截面形貌

图5 涂层1和涂层2万宁自然环境试验站暴晒不同周期后的色差和失光率变化

表1 涂层1和涂层2暴露后的颜色数据

图6 涂层1和涂层2万宁自然环境试验站暴晒不同周期后的红外光谱分析

图7 涂层1和涂层2万宁自然环境试验站暴晒不同周期后电化学阻抗谱

表2 涂层1 EIS拟合结果

图8 不同腐蚀阶段EIS拟合电路

表3 涂层2 EIS拟合结果

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