苯并三氮唑掺杂氧化石墨烯/聚苯胺/环氧复合涂层的防腐性能及缓蚀机理

doi:10.13229/j.cnki.jdxbgxb.20231395

摘要/Abstract

摘要：

为提高6061铝合金表面氧化石墨烯/聚苯胺/环氧复合涂层（GO/PANI/EP）的耐蚀性并探究其缓蚀机理，采用原位共聚法制备了氧化石墨烯（GO）/聚苯胺（PANI）纳米颗粒，通过物理吸附将缓蚀剂苯并三氮唑（BTA）吸附在GO/PANI纳米颗粒表面，得到了GO/PANI/BTA复合材料。红外光谱表明，BTA成功负载于GO/PANI表面，GO/PANI/BTA的吸附率可达18.36%，5 h释放率超过90%，为铝合金提供了有效保护。极化曲线和浸泡实验结果表明，添加1%GO/PANI/BTA的环氧涂层（GO/PANI/BTA/EP ）具有优异的耐腐蚀性，其自腐蚀电位为-0.267 V，比GO/PANI/EP高0.247 V；自腐蚀电流密度为 9.795×10^-9A?cm^-2，比GO/PANI/EP （自腐蚀电流密度为 7.638×10^-7A?cm^-2）低2个数量级。1%GO/PANI/BTA/EP具有优异的耐腐蚀性，其缓蚀机理来自GO屏蔽、PANI钝化和BTA缓蚀的协同效应。

关键词: 氧化石墨烯, 聚苯胺, 苯并三氮唑, 耐腐蚀性, 缓蚀机理

Abstract:

To improve the corrosion resistance of GO/PANI/BTA/EP coating on the surface of 6061 aluminum alloy and explore its corrosion inhibition mechanism，graphene oxide （GO）/polyaniline （PANI） nanoparticles were prepared by in-situ copolymerization method. The corrosion inhibitor benzotriazole （BTA） was adsorbed on the surface of GO/PANI nanoparticles through physical adsorption， resulting in GO/PANI/BTA.The infrared spectrum shows that a layer of BTA has been successfully loaded onto the surface of GO/PANI. The adsorption rate of the loaded BTA on the surface of GO/PANI can reach 18.36%， and the release rate after 5 hours can reach over 90%， providing effective protection for aluminum alloys. The polarization curve and immersion experiment results show that the epoxy coating （GO/PANI/BTA/EP） with 1% GO/PANI/BTA added has excellent corrosion resistance. The self corrosion potential of 1% GO/PANI/BTA/EP is -0.267 V， which is 0.247 V higher than that of GO/PANI/EP； The self corrosion current density is 9.795×10^-9A?cm^-2， higher than GO/PANI/EP （self corrosion current density of 7.638×10^-7A?cm^-2） is two orders of magnitude lower. The 1% GO/PANI/BTA/EP composite coating has excellent corrosion resistance， and its corrosion inhibition mechanism comes from the organic combination of graphene oxide shielding， polyaniline passivation， and BTA corrosion inhibition， achieving a synergistic effect.

Key words: graphene oxide, polyaniline, benzotriazole, corrosion resistance, corrosion inhibition mechanism

中图分类号:

TG174.4

李红玲. 苯并三氮唑掺杂氧化石墨烯/聚苯胺/环氧复合涂层的防腐性能及缓蚀机理[J]. 吉林大学学报(工学版), 2025, 55(8): 2539-2547.

Hong-ling LI. Corrosion resistance and inhibition mechanism of benzotriazole doped graphene/polyaniline/epoxy composite coatings[J]. Journal of Jilin University(Engineering and Technology Edition), 2025, 55(8): 2539-2547.

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涂层	自腐蚀电位/V	自腐蚀电流密度 /（A?cm^-2）
GO/PANI/EP	-0.514	7.638×10^-7
1%GO/PANI/BTA/EP	-0.267	5.582×10^-9
2%GO/PANI/BTA/EP	-0.529	6.743×10^-8
4%GO/PANI/BTA/EP	-0.432	5.831×10^-8