纳米TiO_2/醇酸复合涂层的耐腐蚀性能研究

Study of anticorrosive properties for nanocomposite coatings prepared by nano-TiO_2/alkyd

采用盐雾试验和电化学交流阻抗技术,研究了纳米TiO2对钢板涂层耐腐蚀性能的影响,并通过扫描电镜观察了纳米TiO2复合涂层断面形貌。研究表明,纳米TiO2复合涂层的耐腐蚀性能均优于未添加纳米TiO2涂层,当纳米TiO2添加量为1.5%(质量分数)时,涂层耐盐雾时间由420h提高到710h,涂层阻抗值也由107Ω.cm2增加至109Ω.cm2。从涂层断面观察发现,纳米TiO2添加量为1.5%(质量分数)时,颗粒较均匀分散,粘接紧密,形成较为致密的纳米复合涂层。

Anticorrosive performaces of the coatings with different dosage of nanometer TiO2 are investigated by means of salt spray and EIS（electrochemical impedance spectroscopy） measurement in conjunction with SEM . The results show that compared with non-nanometer coatings,anticorrosive properties of coatings with different addition of nanoparticle TiO2 are improved respectively. Of them,the best is coatings with 1.5% nano-TiO2 ,anti-salt spray time of which is improved from 420h to 710h. And resistance of the coatings is increased by 10^9Ω·cm^2 on the basis of original 10^7Ω·cm^2. Also,SEM photographes show that the coatings with 1.5% nano-TiO2 is more imuacted and tighter relative to other coatings.