耦接件涂层失效程度与其力学损伤之间的关系

doi:10.11902/1005.4537.2023.370

中国腐蚀与防护学报

2024, Vol. 44

Issue (3): 679-690 CSTR: 32134.14.1005.4537.2023.370 DOI: 10.11902/1005.4537.2023.370

研究报告

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耦接件涂层失效程度与其力学损伤之间的关系

李卓玄¹, 曹艳辉¹, 李崇杰¹, 李辉², 张小明², 雍兴跃¹(

)

1.北京化工大学有机无机复合材料国家重点实验室北京 100029
2.中国航空工业集团公司第一飞机设计研究院西安 710089

Relationship Between Corrosion Failure Degree of Organic Coatings and Mechanical Properties for Dissimilar Metal Assamblies

LI Zhuoxuan¹, CAO Yanhui¹, LI Chongjie¹, LI Hui², ZHANG Xiaoming², YONG Xingyue¹(

)

1. State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
2. AVIC Xi'an Aircraft Design and Research Institute, Xi'an 710089, China

引用本文:

李卓玄, 曹艳辉, 李崇杰, 李辉, 张小明, 雍兴跃. 耦接件涂层失效程度与其力学损伤之间的关系[J]. 中国腐蚀与防护学报, 2024, 44(3): 679-690.
Zhuoxuan LI, Yanhui CAO, Chongjie LI, Hui LI, Xiaoming ZHANG, Xingyue YONG. Relationship Between Corrosion Failure Degree of Organic Coatings and Mechanical Properties for Dissimilar Metal Assamblies[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(3): 679-690.

全文: PDF(8954 KB) HTML

摘要:

以300M钢，2024和5A06铝合金涂层体系作为实验材料，采用不同的耦接模式将其与钛合金耦接，并依次进行了湿热、盐雾和霉菌加速实验。然后，利用层次分析法(AHP)，分析建立了有机涂层失效综合评价模型，并通过电化学阻抗谱(EIS)对评价结果进行了验证。最后，利用万能拉伸试验机，测试了加速实验后涂层样品的力学性能，建立了涂层失效程度与其力学性能损伤之间的关系。结果表明，经过加速实验之后，耦接涂层样品的抗拉强度和断裂延伸率均出现一定程度的下降，且其下降程度与耦接方式有关。同时，经过加速实验之后，涂层样品力学性能与其综合评价结果呈明显的负相关关系。

关键词 ：耦接件, 加速实验, 有机涂层失效, 电化学阻抗谱, 力学性能

Abstract：

As one of the most common methods for galvanic corrosion control, organic coating has wildly used in an aerospace field. However, the failure of organic coatings often leads to the deterioration of mechanical properties of the dissimilar metal assemblies. In this work, selected organic coatings were applied on plates of 300M steel, 2024, and 5A06 Al-alloy respectively, then which were coupled with Ti-alloy plate by different modes. Afterwards, the dissimilar metal assemblies were subjected to lab accelerated tests in conditions of hot-humid, with mucedine, and of salt-spray in succession. Then, the acquired test results were analyzed and a comprehensive evaluation model for organic coating failures was established according to the so-called “Analytic Hierarchy Process (AHP)”, and which was verified by the measured results of electrochemical impedance spectroscopy (EIS) of the above assmeblies after lab accelerated tests. Furthermore, the mechanical properties of the dissimilar metal assemblies were examined by using a universal tensile testing machine after accelerated tests, and so that the relationship between the failure degree of organic coatings and damage degree of mechanical property of the dissimilar metal assemblies was established. The results indicate that the tensile strength and fracture elongation of the assemblies decrease to a certain degree after accelerated tests, which depend on the coupling modes. Meanwhile, there is a significant negative correlation between the mechanical properties and the comprehensive evaluation values for the dissimilar metal assemblies.

Key words： coupled specimen accelerated test organic coating failure electrochemical impedance spectroscopy mechanical property

收稿日期: 2023-11-20 32134.14.1005.4537.2023.370

ZTFLH:

TG174.46

基金资助:国家自然科学基金(52171062)

通讯作者: 雍兴跃，E-mail：yongxy@mail.buct.edu.cn，研究方向为腐蚀电化学

Corresponding author: YONG Xingyue, E-mail: yongxy@mail.buct.edu.cn

作者简介: 李卓玄，男，1995年生，博士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2023.370 或 https://www.jcscp.org/CN/Y2024/V44/I3/679

表1 300M钢、2024与5A06铝合金以及TC12钛合金的化学成分

图1 涂层样品示意图

图2 钛合金与对偶材料的耦接方式示意图

表2 涂层样品及耦接模式

图3 湿热实验温度控制图

图 4 涂层样品电化学测试时电解池示意图

图5 层次分析法结构图

表 3 不同关键评价指标重要性比较

图6 加速实验后涂层样品表面形貌图

表4 加速实验后涂层的单项指标评级

表5 涂层失效的综合评价值与阻抗模值

图7 加速实验后涂层样品的应力-应变曲线

图8 不同耦接方式涂层样品加速实验后的抗拉强度及断裂伸长率

图9 300M合金钢涂层样品加速实验后的断口形貌

图10 2024铝合金涂层样品加速实验后的断口形貌

图11 5A06铝合金涂层样品加速实验后的断口形貌

图12 涂层体系抗拉强度及断裂延伸率与综合评分之间的关系

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