环氧防腐涂料在模拟海水干湿交替条件下的失效过程

doi:10.11902/1005.4537.2018.152

中国腐蚀与防护学报

2019, Vol. 39

Issue (6): 571-580 DOI: 10.11902/1005.4537.2018.152

研究报告

本期目录 | 过刊浏览

环氧防腐涂料在模拟海水干湿交替条件下的失效过程

王贵容^1,²,郑宏鹏¹,蔡华洋¹,邵亚薇¹(

),王艳秋¹,孟国哲¹,刘斌¹

1. 哈尔滨工程大学材料科学与化学工程学院哈尔滨 150001
2. 航空工业成都飞机工业 (集团) 有限责任公司成都 610092

Failure Process of Epoxy Coating Subjected Test of Alternating Immersion in Artificial Seawater and Dry in Air

WANG Guirong^1,²,ZHENG Hongpeng¹,CAI Huayang¹,SHAO Yawei¹(

),WANG Yanqiu¹,MENG Guozhe¹,LIU Bin¹

1. College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
2. Aviation Industry Chengdu Aircraft Industry (Group) Co. , Ltd. , Chengdu 610092, China

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摘要:

用电化学阻抗谱 (EIS)、附着力测试、Fourier红外光谱 (FT-IR) 和扫描电镜 (SEM) 等分析手段研究了环氧防腐涂层在干湿交替及全浸泡环境下的失效过程。结果表明，干湿交替环境中环氧防腐涂层前期的防护效果较好，涂层后期失效快于全浸泡环境下的失效速率；环氧防腐涂层在干湿交替环境下失效的原因是由于涂层交替的吸水和失水过程使得涂层孔隙率增大，对涂层造成机械损坏，使得涂层内部及表面开裂，最终导致附着力降低，涂层大面积起泡失效。

关键词 ：环氧防腐涂层, 干湿交替, 涂层孔隙, 鼓泡失效

Abstract：

The failure process of the epoxy coating subjected to test of alternating immersion in artificial seawater and dry in air was studied by means of electrochemical impedance technique (EIS), Fourier transform infrared spectrometry (FT-IR), scanning electronic microscope (SEM), adhesion test and water absorption measurement. The results showed that, in the earlier test period, the epoxy coating subjected to wed-dry cycle test presents higher protectiveness than that subjected to merely immersion test. At the last test period, the former coating failed faster than the later one. The failure mechanism of the epoxy coating during wet-dry cycle testing may be proposed as that the coating matrix underwent alternate absorption and loss of water during the test, correspondingly, the relevant swelling and shrinking may generate more porosity within the coating, as a result, mechanical damages, such as cracks may develop from the interior to the surface of the coating, leads to lower adhesion and blisters of the coating eventually.

Key words： epoxy coating dry-wet cycle porosity of the coating blisters failure

收稿日期: 2018-10-23

ZTFLH:

TG174.461

基金资助:国家重点研发计划(2016YFB0300604)

通讯作者: 邵亚薇 E-mail: shaoyawei@hrbeu.edu.cn

Corresponding author: Yawei SHAO E-mail: shaoyawei@hrbeu.edu.cn

作者简介: 王贵容，女，1992年生，硕士生

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引用本文:

王贵容,郑宏鹏,蔡华洋,邵亚薇,王艳秋,孟国哲,刘斌. 环氧防腐涂料在模拟海水干湿交替条件下的失效过程[J]. 中国腐蚀与防护学报, 2019, 39(6): 571-580.
Guirong WANG, Hongpeng ZHENG, Huayang CAI, Yawei SHAO, Yanqiu WANG, Guozhe MENG, Bin LIU. Failure Process of Epoxy Coating Subjected Test of Alternating Immersion in Artificial Seawater and Dry in Air. Journal of Chinese Society for Corrosion and protection, 2019, 39(6): 571-580.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2018.152 或 https://www.jcscp.org/CN/Y2019/V39/I6/571

图1 干湿交替实验装置

图2 涂层在不同浸泡时期下的阻抗图

图3 涂层在不同干湿交替循环时期下的阻抗图

图4 涂层在全浸泡及干湿交替循环后的低频阻抗模值|Z|0.01 Hz变化谱

图5 全浸泡2050 h及干湿交替210个循环后试样的宏观表面形貌

图6 全浸泡和干湿交替暴露条件下涂层的附着力随时间的变化

图7 经不同时间全浸实验后涂层样品进行结合力测试的拉拔实验后的表面形貌照片

图8 干湿交替条件下不同阶段涂层/金属体系拉拔实验后表面形貌照片

图9 干湿交替及全浸泡条件下涂层失效后的FT-IR谱

图10 不同时期的等效电路图

图11 全浸泡及干湿交替条件下涂层电阻随时间的变化曲线

图12 干湿交替及全浸环境下涂层孔隙率的变化曲线

图13 浸泡2050 h及干湿交替210个循环后试样的微观形貌

图14 未浸泡、全浸泡及干湿交替后涂层截面的微观形貌

图15 不同干湿交替循环次数下涂层吸水率的变化曲线

图16 环氧防腐涂层干湿交替失效机理模型

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