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.
出处
《石油化工》
CAS
CSCD
北大核心
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)
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
composite films
engineering metal
anticorrosion
layered double hydroxide film
silica coating
