刘敏,张海兵,林冰,唐鋆磊,郑宏鹏,王莹莹,侯健,唐聿明,黎红英,李平.实验室加速环境下水性快干环氧厚浆底漆老化机理及失效过程[J].表面技术,2022,51(11):305-317.
LIU Min,ZHANG Hai-bing,LIN Bing,TANG Jun-lei,ZHENG Hong-peng,WANG Ying-ying,HOU Jian,TANG Yun-ming,LI Hong-ying,LI Ping.Study on Aging Mechanism and Failure Process of Waterborne Epoxy Primer under Accelerated Environment in Laboratory[J].Surface Technology,2022,51(11):305-317 |
| 实验室加速环境下水性快干环氧厚浆底漆老化机理及失效过程 |
| Study on Aging Mechanism and Failure Process of Waterborne Epoxy Primer under Accelerated Environment in Laboratory |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.11.029 |
| 中文关键词: 实验室循环加速试验 混料法 水性环氧底漆 交流阻抗 水降解 光氧降解 失效过程 |
| 英文关键词:laboratory cyclic accelerated test mixing method waterborne epoxy primer EIS hydrolytic degradation photooxidation failure process |
| 基金项目:四川省科技厅重大科技专项(2019YFG0384、2019YFG0380、2021YFSY0055);海洋腐蚀与防护重点实验室开放研究基金(KF190405) |
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| Author | Institution |
| LIU Min | School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China |
| ZHANG Hai-bing | State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute LSMRI, Qingdao 266237, China |
| LIN Bing | School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China |
| TANG Jun-lei | School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China |
| ZHENG Hong-peng | School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China |
| WANG Ying-ying | School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China |
| HOU Jian | State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute LSMRI, Qingdao 266237, China |
| TANG Yun-ming | School of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China |
| LI Hong-ying | AECC Chengdu Engine Co., Ltd, Chengdu 610503, China |
| LI Ping | School of Computer Science, Southwest Petroleum University, Chengdu 610500, China |
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| 中文摘要: |
| 目的 通过实验室循环加速试验模拟海洋大气环境，研究水性快干环氧厚浆底漆在服役过程中的老化机理及失效过程。方法 设计“浸泡−紫外/冷凝−湿热老化循环加速试验”，并借鉴化学配方问题中的混料法设计循环试验中各单因素试验时长，随机生成3组不同时间组合的循环加速试验环境谱。采用电化学交流阻抗法，结合光泽度、色差、硬度、附着力及红外光谱等数据研究底漆的性能变化。结果 在3组不同环境循环试验中，环境1(浸泡24 h−紫外/冷凝72 h−湿热老化48 h)中的底漆破坏程度最严重，硬度下降明显，6个循环周期后失光率、色差显著升高，等级分别为严重失光和严重失色，低频阻抗下降至3.9×103 Ω.cm2;环境2(浸泡/4 h−紫外/冷凝12 h−湿热老化78 h)和环境3(浸泡54 h−紫外/冷凝42 h−湿热老化48 h)中的涂层硬度无明显变化，涂层附着力先上升后下降，试验结束后涂层低频阻抗均下降至2.7×105 Ω.cm2。结论 水性环氧厚浆底漆的老化机理为亲水基团引起的水降解和紫外辐照引起的光氧降解间的协同作用，失效过程可分为涂层吸水、涂层/金属基体界面腐蚀发生和涂层失效等3个阶段。 |
| 英文摘要: |
| Waterborne epoxy coatings are one of the most popular environmentally friendly coatings, but their constituent components are complex and their stability is poor. In order to further improve the protective performance of the coating，the aging mechanism and failure process of waterborne epoxy coating were studied by simulating marine atmospheric environment through laboratory cyclic acceleration test. The cyclic accelerated test of immersion-UV/condensation-hygrothermal aging was designed to simulate the randomness of the natural environment. And the mixing method in the chemical formula problem was used to design the test time of each single factor in the cyclic test. Firstly, determine the test time of 1 cycle as 144 h. Then, the minimum test time of immersion, UV/condensation and hygrothermal aging test and their percentage in the total cycle time were determined to be 24 h(17%), 12 h(8%) and 48 h(33%). Finally, the matrix table was obtained by mixing method and substituted into the total cycle time for conversion to generate three groups of cyclic acceleration test environment spectrum under different time combinations. Cut the carbon steel into a sample with a size of 50 mm × 50 mm × 2 mm, and cleaned after sandblasting (Sa 2.5). The A and B components of the water-based epoxy coating were prepared according to the volume ratio of 1.35∶1 and then mixed with 10%~15% deionized water. After curing for 20~30 min, spray on the surface of the sample by air spraying. Apply the W-101 gravity spray gun in the experiment. Scanning electron microscope (ZEISS EV0 MA15) was used to observe the micro morphology of the coating surface, and analyze the structure of the coating. by a Fourier infrared spectrometer (TENSOR27) The electrochemical impedance spectroscopy was used to study the failure process of the coating, and the changes in the protective performance of the coating were studied by combining data such as gloss, color difference, hardness and adhesion. After the cyclic tests in three different environments, micropores and cracks appeared on the surface of the coating. The damage of coating was the most serious in Environment 1 (immersion 24 h-UV/condensation/72 h-hygrothermal aging 48 h), and the hardness decreased from 118 to 78.5, with no obvious change in adhesion. After 6 cycles, the gloss loss reached 55.8%, and the color difference reached 26.21, showing severe gloss loss and color loss. After the cyclic test, the low-frequency impedance decreased to 3.9×103 Ω.cm2. The coating hardness in Environment 2(immersion 54 h-UV/condensation 12 h- hygrothermal aging 78 h) and Environment 3 (immersion 54 h-UV/condensation 42 h-hygrothermal aging 48 h) did not change significantly, and the adhesion of the coating first increased and then decreased. The degree of gloss loss and color loss of the coating in Environment 3 was greater than that in environment 2, and the grades were obvious gloss loss (level 3) and severe discoloration (level 5). After the test, the low-frequency impedance of the coatings in the two environments decreased to 2.7× 105 Ω.cm2. The aging mechanism of waterborne epoxy coating was the synergistic effect of water degradation caused by hydroxyl groups and photooxidation degradation caused by UV irradiation. The failure process was divided into three stages:coating absorbing water, coating/metal matrix interface corrosion and coating failure. |
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