摘要
研究了含量分别为0%,1%,3%和5%(质量分数)的硅烷偶联剂改性前后的纳米TiO_2对涂覆在45#碳钢上的聚氨酯涂层耐蚀性能的影响。场发射电镜(FESEM)测试结果表明,未改性纳米TiO_2在涂层中以团聚体的状态存在,经过硅烷偶联剂KH-570改性后的纳米TiO_2在涂层中均匀分散,其中含量为3%的涂层结构最为致密。采用电化学阻抗(EIS)技术研究了纳米TiO_2/聚氨酯复合涂层在3.5%Na Cl溶液中浸泡不同时间的阻抗行为,实验结果表明添加硅烷偶联剂改性纳米TiO_2可明显提高聚氨酯涂层的耐蚀性,其中含3%改性纳米TiO_2的涂层在浸泡过程中,始终呈现一个时间常数特征,在浸泡至2880 h后,涂层电阻仍然为2.6×108Ω·cm2,明显高于其他组分的涂层电阻,表明该涂层具有最好的耐蚀性。
The effect of nano- TiO2 and silane modified nano- TiO2 on the corrosion resistance of polyurethane coating on 45^# carbon steel in 3.5%Na Cl solution was studied by means of electrochemical impedance spectroscopy（EIS） and field-emission scanning electron microscopy（FESEM）.Results showed that the nano- TiO2 particles aggregated to some extent, while the silane modified ones dispersed well in the polyurethane. The addition of the modified nano-TiO2 could effectively improve the corrosion resistance of the polyurethane coatings. Among others, the polyurethane composite coating containing 3%（mass fraction） silane modified TiO2 possessed the highest corrosion resistance with only one time constant on its impedance spectra. After immersion for 2880 h,the electrochemical impedance of the coating even kept at a level around 2.6×10^8Ω·cm^2.
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2016年第6期549-554,共6页
Corrosion Science and Protection Technology
基金
佛山市科技计划项目(2015AG10017)资助
