景超杰,郭辉,赵方超,吴德权,陈雪晴,刘杰.BI@ZIF-8/EP涂层的制备及在深海压力下的防护性能研究[J].表面技术,2024,53(8):93-106.
JING Chaojie,GUO Hui,ZHAO Fangchao,WU Dequan,CHEN Xueqing,LIU Jie.Preparation and Protective Performance of BI@ZIF-8/EP Coating under Deep-sea Pressure[J].Surface Technology,2024,53(8):93-106 |
| BI@ZIF-8/EP涂层的制备及在深海压力下的防护性能研究 |
| Preparation and Protective Performance of BI@ZIF-8/EP Coating under Deep-sea Pressure |
| 投稿时间：2023-05-05 修订日期：2023-09-12 |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.08.009 |
| 中文关键词: 静水压力 模拟深海压力 失效进程 红外光谱 电化学阻抗谱 吸附膜 |
| 英文关键词:hydrostatic pressure simulated deep-sea pressure failure process infrared spectrum electrochemical impedance spectroscopy adsorption film |
| 基金项目:重庆市技术创新与应用发展专项重点项目(KJJ202105);国家自然科学基金(51971192);山东省自然科学基金面上项目(ZR2020ME132) |
| 作者 | 单位 |
| 景超杰 | 西南技术工程研究所 国防科技工业自然环境试验研究中心，重庆 400039 |
| 郭辉 | 烟台大学 化学化工学院，山东 烟台 264005 |
| 赵方超 | 西南技术工程研究所 国防科技工业自然环境试验研究中心，重庆 400039 |
| 吴德权 | 西南技术工程研究所 国防科技工业自然环境试验研究中心，重庆 400039 |
| 陈雪晴 | 中国航空综合技术研究所，北京 100028 |
| 刘杰 | 烟台大学 化学化工学院，山东 烟台 264005 |
|
| Author | Institution |
| JING Chaojie | Weathering Test and Research Center of Science Technology and Industry for National Defense, Southwest Institute of Technology and Engineering, Chongqing 400039, China |
| GUO Hui | School of Chemistry and Chemical Engineering, Yantai University, Shandong Yantai 264005, China |
| ZHAO Fangchao | Weathering Test and Research Center of Science Technology and Industry for National Defense, Southwest Institute of Technology and Engineering, Chongqing 400039, China |
| WU Dequan | Weathering Test and Research Center of Science Technology and Industry for National Defense, Southwest Institute of Technology and Engineering, Chongqing 400039, China |
| CHEN Xueqing | AVIC China Aero-Polytechnology Establishment, Beijing 100028, China |
| LIU Jie | School of Chemistry and Chemical Engineering, Yantai University, Shandong Yantai 264005, China |
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| 中文摘要: |
| 目的 制备负载苯并咪唑(BI)的BI@ZIF-8粒子，研究BI@ZIF-8/EP涂层在2种静水压力下的失效行为。方法 制备并表征BI@ZIF-8粒子。制备BI@ZIF-8/EP涂层，在常压(0.1 MPa)和模拟深海压力(6 MPa)开展浸泡实验。通过微观形貌、失光率、色差、附着力、红外光谱、电化学阻抗谱等手段进行涂层失效行为对比分析。结果 成功制备了BI@ZIF-8粒子;在相同压力条件下，BI@ZIF-8/EP涂层具有更高的附着力和阻抗值;同种涂层在6 MPa下退化更加严重，附着力和阻抗值下降速率增大;随着浸泡时间的延长，6 MPa下BI@ZIF-8/EP涂层中的BI特征峰强度明显减弱，2种涂层的主要特征峰强度均有下降。结论 ZIF-8粒子中的咪唑基，能增加环氧涂层交联密度，降低侵蚀性粒子渗透速率;高静水压能显著加速侵蚀性粒子向涂层内部的扩散，并加速有机涂层失效进程;BI分子和2-Melm分子中N原子的孤电子对与Fe原子的空轨道能在金属基体表面形成吸附膜，并且Zn2+和OH−能在金属基体表面形成沉积膜，有效减缓了金属腐蚀。此外，2种涂层的退化机制不受静水压力升高的影响。 |
| 英文摘要: |
| The high pressure, low temperature, low dissolved oxygen and other harsh environments in the deep sea could cause accelerated failure of organic coatings. This has seriously threatened the service safety of deep-sea equipment. ZIF-8 is a representative zeolite imidazole type MOFs material. It is widely used in metal corrosion protection field because of its small particle size, high porosity and high specific surface area. Therefore, the work aims to develop a test protocol to investigate the failure behavior of the coating containing ZIF-8 particles loaded with corrosion inhibitors under two seawater pressure. In this work, the BI@ZIF-8 functional particles were prepared by the one-pot method, and the BI@ZIF-8/EP coatings were prepared by adding BI@ZIF-8 directly to epoxy coatings at the optimal mass ratio based on the conclusions drawn from the content of the previous studies. The structural characterization of the BI@ZIF-8 functional particles was carried out by FI-IR, XRD, UV, SEM, and TG. The prepared BI@ZIF-8/EP coatings were also subject to simulated seawater (3.5 wt.% NaCl) immersion tests at atmospheric pressure (0.1 MPa) and simulated deep-sea pressure (6 MPa). A blank control group of EP coating was also set up for comparison clarity. The comparative analysis of the failure behavior of the coating was carried out from the perspective of surface morphology, light loss rate, color difference, coating adhesion, electrochemical impedance spectrum and chemical structure. The test results showed that high hydrostatic pressure could significantly accelerate the diffusion of corrosive particles to the interior of the coating and accelerate the failure process of the coating. In the test of adhesion, BI@ZIF-8/EP coating had higher adhesion, and the adhesion decreased by 21.6% and 55.7% for 1 008 h under 0.1 and 6 MPa, respectively, which was significantly higher than that of EP coating under the same conditions. This was because the imidazole group in ZIF-8 particles could increase the crosslink density of epoxy coating and reduce the permeability of corrosive particles, which made BI@ZIF-8/EP coating have a higher adhesion. The BI@ZIF-8/EP coating consistently had higher impedance values under the same pressure conditions. After 1 008 h of test under 6 MPa, the impedance value of the EP coating dropped to 3.2×104 Ω∙cm2, which meant that the protective performance of the EP coating was largely lost. At this time, the impedance value of the BI@ZIF-8/EP coating was 4.39×106 Ω∙cm2 and the coating still had a certain protection ability. The reason was that the lone electron pair of N atom in BI molecule and 2-Melm molecule and the empty orbital of Fe atom could form adsorption film on the surface of metal substrate, and Zn2+ and OH− could form deposition film on the surface of metal substrate. The area and intensity of electrochemical reactions under the coating were effectively reduced. The rust at high water pressure and high Cl− concentration were transformed into streaky corrosion products. In the FT-IR test, the intensity of the BI characteristic peak in the BI@ZIF-8/EP coating under 6 MPa was significantly weakened with increasing immersion time, indicating that the degradation mechanism of the coating was not affected by pressure conditions. |
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