缓蚀剂组合的容器负载方式对铝合金涂层耐蚀性能的影响  

Effect of container loading method of corrosion inhibitor combination on corrosion resistance of aluminum alloy coating

作　　者：陈高红[1,2,3] 张月 李应权 刘建华 于美[1] CHEN Gaohong;ZHANG Yue;LI Yingquan;LIU Jianhua;YU Mei(School of Materials Science and Engineering,Beihang University,Beijing 100191,China;AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Beijing Engineering Research Center of Advanced Aluminum Alloys and Applications,Beijing 100095,China)

机构地区：[1]北京航空航天大学材料科学与工程学院,北京100191 [2]中国航发北京航空材料研究院,北京100095 [3]北京市先进铝合金材料及应用工程技术研究中心,北京100095

出　　处：《材料工程》2022年第2期153-163,共11页Journal of Materials Engineering

摘　　要：采用减压吸附和层层自组装技术在介孔二氧化硅纳米颗粒(mesoporous silica nanoparticles,MSN)上同时负载8-羟基喹啉(8-hydroxyquinoline,8-HQ)和苯并三氮唑(1H-benzotriazole,BTA),制备缓蚀剂复合纳米容器(MSN-QB),并将其添加至环氧涂层中从而获得新的涂层(MQB)。利用扫描电镜、透射电镜、傅里叶红外光谱、Zeta电位测试、热重分析等研究缓蚀剂负载前后纳米容器结构的变化和缓蚀剂的刺激响应释放行为,并通过电化学测试和盐雾实验研究层层自组装方式对涂层防护性能的提升。结果表明:MSN-QB中8-HQ和BTA的负载量分别为6.8%(质量分数,下同)和7.1%。MSN-QB具有pH响应特性,8-HQ和BTA在中性条件下释放均受到抑制,在碱性(pH=10)和酸性(pH=4)条件下均可释放,碱性条件下的释放速率更高。MQB涂层具有最佳的耐蚀性能,在3.5%NaCl溶液中浸泡20天后,MQB涂层的低频阻抗值(2.0×10^(9)Ω·cm^(2))最大,是缓蚀剂单独负载并添加到涂层中的两倍以上。The composite nanocontainer of corrosion inhibitor(MSN-QB)was prepared by loading octahydroxyquinoline(8-HQ)and benzotriazole(BTA)on mesoporous silica nanoparticles(MSN)simultaneously using vacuum adsorption and layer-by-layer self-assembly technology,and added to the epoxy coating to obtain a new coating(MQB).SEM,TEM,FT-IR,Zeta-potential and TGA were used to study the structure changes of the nanocontainer before and after loading corrosion inhibitors and the stimulus response release behavior of the corrosion inhibitors,and electrochemical test and salt spray test were used to study the improvement of coating protection performance by layer-by-layer self-assembly technique.The results show that the loadings of 8-HQ and BTA in MSN-QB are 6.8%(mass fraction)and 7.1%,respectively.MSN-QB has pH response characteristics.The release of 8-HQ and BTA are both inhibited under neutral conditions,but can be released under alkaline(pH=10)and acidic(pH=4)conditions.The release rate under alkaline conditions is higher.MQB coating has the best corrosion resistance.After immersed in 3.5%NaCl solution 20 d,the MQB coating has the largest|Z|_(0.01 Hz) value(2.0×10^(9)Ω·cm^(2)),more than twice that of MQ+MB coating.

关 键 词：缓蚀剂组合 负载方式 层层自组装 铝合金 耐蚀性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]