镁合金表面羟基磷灰石/介孔SiO2自修复耐蚀涂层的研究  

Study on self-repairing anti-corrosion coatings of hydroxyapatite/mesoporous SiO2 on magnesium alloy surface

作　　者：荣威 赵恒 梁小红[1] RONG Wei;ZHAO Heng;LIANG Xiao-hong(College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学材料科学与工程学院,山西太原030024

出　　处：《应用化工》2020年第4期933-939,944,共8页Applied Chemical Industry

基　　金：山西省基础研究计划项目(2013021013-1)。

摘　　要：通过旋涂法,在AZ31镁合金表面制备了聚多巴胺/羟基磷灰石复合涂层,并将负载有缓蚀剂2-巯基苯并咪唑(MBI)的介孔SiO 2纳米颗粒掺杂到复合涂层中,以改善镁合金的耐腐蚀性能。使用SEM、TEM、XRD和BET等手段表征介孔SiO 2纳米颗粒的形貌、结构及缓蚀剂的负载情况;通过傅里叶红外光谱(FTIR)和扫描电子显微镜(SEM)对涂层的成分和形貌进行表征;使用电化学阻抗谱(EIS)研究了不同涂层的耐蚀性能和自修复性能。结果表明,制备的二氧化硅为介孔纳米颗粒,可负载缓蚀剂。将负载有缓蚀剂MBI的介孔SiO 2纳米颗粒掺杂到聚多巴胺/羟基磷灰石复合涂层中,能够改善涂层的耐蚀性能,使涂层具有自修复性能。A polydopamine/hydroxyapatite composite coating was prepared on the surface of AZ31 magnesium alloy by spin coating.And the inhibitor-loaded silica nanocontainers were doped into the composite coating to improve the corrosion resistance of magnesium alloy.SEM,TEM,XRD,BET and other methods were used to characterize the morphology,structure of mesoporous SiO 2 nanoparticles and load situation of corrosion inhibitor.The composition and morphology of the coatings were characterized by FTIR and SEM.The corrosion resistance and self-repair properties of different coatings were investigated by EIS.The results show that the as-prepared SiO 2 are nanoparticles with a mesoporous structure.The SiO 2 nanoparticles can successfully support the corrosion inhibitor 2-mercaptobenzimidazole.The corrosion resistance and self-repairing properties of the coating could be improved by doping of the inhibitor-loaded silica nanocontainers into the polydopamine/hydroxyapatite coating.

关 键 词：AZ31镁合金 羟基磷灰石 缓蚀剂 介孔SiO 2纳米颗粒 自修复性能 

分 类 号：TQ115[化学工程—无机化工]