类水滑石/二氧化硅复合薄膜的制备及其防腐蚀性能  

Preparation and corrosion resistance of composite layered double hydroxide/SiO_2 films

作　　者：张寅曼 闫婷婷[1] 张法智[1] 

机构地区：[1]北京化工大学化工资源有效利用国家重点实验室,北京100029

出　　处：《石油化工》2016年第5期521-527,共7页Petrochemical Technology

基　　金：国家自然科学基金项目(21376019)

摘　　要：采用两步法,在金属铝表面通过浸涂法制得一层致密的SiO_2涂层,再以此为基体采用原位生长法制备类水滑石(LDH)薄膜,得到LDH/SiO_2复合薄膜。采用XRD和SEM等手段对复合薄膜的晶体结构和形貌进行了表征,考察了SiO_2涂层干燥温度、LDH薄膜生长温度、生长时间等条件对LDH薄膜形貌及结构的影响,在适宜条件(SiO_2涂层干燥温度150℃、LDH薄膜生长温度120℃及生长时间24 h)下制备了晶粒均匀致密的LDH薄膜。采用极化曲线和电化学交流阻抗谱研究了LDH/SiO_2复合薄膜的防腐蚀性能。实验结果表明,复合薄膜保护下金属铝的维钝电流低达10-9 A/cm2,阻抗值高达105 Ohm。同时,该复合薄膜对金属铝表现出较稳定的防腐蚀效果。Composite layered double hydroxide/SiO_2（LDH/SiO_2） films with metal Al sheet as substrate were prepared by a two-step method. Firstly,the SiO_2 coating was prepared on the surface of Al substrate by the dip-coating method and then the LDH films were prepared on the SiO_2-coated Al substrate by the in-situ growth method. The effects of drying temperature of the SiO_2 coating,preparation temperature and time of the LDH films on their morphology and structure were investigated. The appropriate conditions for the preparation of LDH/SiO_2 films were the drying temperature of the SiO_2 coating 150 ℃,the growth temperature of the LDH film 120 ℃ and the growth time 24 h. The corrosion resistance of the composite LDH/SiO_2 film was characterized by means of polarization curves and EIS method,which showed that the passive current and impedance value of the composite LDH/SiO_2 film reached 10-9 A/cm2 and 105 Ohm,respectively. The composite LDH/SiO_2 films exhibited a good stability（30 d） in corrosion resistance for the Al sheet in 3.5%（w）Na Cl solution.

关 键 词：复合薄膜 工程金属 防腐蚀 类水滑石薄膜 氧化硅涂层 

分 类 号：TQ050.9[化学工程]