摘要
AA6061铝合金在航空航天、汽车制造及船舶工业等领域应用广泛,但其在酸性环境中的耐腐蚀性能较差,限制了其使用寿命。为提高其耐腐蚀性能,采用二乙醇胺(DEA)和羧乙基硫代丁二酸(CETSA)合成了3种不同摩尔比的离子液体,并对其在0.1 mol/L HCl溶液中对AA6061铝合金的缓蚀性能进行了系统的研究。结果表明,1∶3[DEA][CETSA]体系表现出最优异的缓蚀效果,在特定条件下缓蚀效率高达99.21%,显著优于其他比例。电化学测试和表面形貌分析表明,该离子液体通过形成致密保护膜、提高电荷转移电阻达938.40Ω·cm^(2)、抑制阴极反应以及金属离子络合等多重机制协同抑制腐蚀,能有效减少铝合金表面的裂纹和蚀坑。随DEA比例增加,铝合金表面亲水性增强,接触角从141.78°降至112.44°,为材料表面性质调控提供了新思路。热重分析显示离子液体的热稳定性随DEA比例增加而提高,1∶3[DEA][CETSA]的完全分解温度达405~415℃,适合高温环境应用。本研究为开发高效缓蚀剂及提升铝合金在严苛环境下的耐久性提供了理论依据和技术支持。
The aluminum alloy of is widely used in aerospace,automotive manufacturing,and shipbuilding industries,but its poor corrosion resistance in acidic environments limits its service life.To improve its corrosion resistance,this study synthesized three ionic liquids with different molar ratios using diethanolamine(DEA)and carboxyethylthiosuccinic acid(CETSA),and systematically investigated their corrosion inhibition performance on AA6061 aluminum alloy in 0.1 mol/L HCl solution.The results demonstrated that the 1∶3[DEA][CETSA]system exhibited the best corrosion inhibition effect,achieving an efficiency of up to 99.21%under specific conditions,significantly outperforming other ratios.Electrochemical tests and surface morphology analysis revealed that the ionic liquid inhibited corrosion through multiple synergistic mechanisms,including the formation of a dense protective film,an increase in charge transfer resistance(reaching 938.40Ω·cm^(2)),suppression of cathodic reactions,and metal ion complexation,effectively reducing surface cracks and pits on the aluminum alloy.Additionally,as the DEA ratio increased,the hydrophilicity of the aluminum alloy surface improved,with the contact angle decreasing from 141.78°to 112.44°,providing new insights for regulating material surface properties.Thermogravimetric analysis showed that the thermal stability of the ionic liquids improved with increasing DEA ratio,and the 1∶3[DEA][CETSA]system exhibited a complete decomposition temperature of 405~415℃,making it suitable for high-temperature applications.This study provides theoretical and technical support for developing high-efficiency corrosion inhibitors and enhancing the durability of aluminum alloys in harsh environments.
作者
孙健
郑越
高华晶
金朝辉
高子健
王迪
任海伦
SUN Jian;ZHENG Yue;GAO Huajing;JIN Zhaohui;GAO Zijian;WANG Di;REN Hailun(School of Petrochemical Technology,Jilin Institute of Chemical Technology,Jilin 132022,China;Graduate School,Jilin Institute of Chemical Technology,Jilin 132022,China;Tianjin Renai College,Tianjin 300000,China)
出处
《应用化工》
北大核心
2025年第8期2024-2030,共7页
Applied Chemical Industry
基金
吉林省自然科学基金(YDZJ202201zyTS386)。
关键词
离子液体
AA6061铝合金
缓蚀
ionic liquids
AA6061 aluminum alloy
corrosion inhibition
