摘要
研究了纳米SiO2添加量对环氧复合钢板涂层硬度、T弯和应变等机械性能的影响,并通过盐雾试验和电化学交流阻抗技术对涂层的耐腐蚀性能进行了测试。研究表明,纳米SiO2添加量为2.0%时,涂层性能有较大的提高,铅笔硬度从H提高到2H,T弯从4T改善到2T,涂层的耐盐雾时间也由720 h增加到1030 h,提高了40%以上。从电化学交流阻抗谱图得出,添加量为2.0%的纳米SiO2复合涂层的阻抗值最大,高于未添加纳米SiO2涂层的阻抗值近2个数量级。另外,涂层的SEM照片显示,纳米SiO2添加量为2.0%时,颗粒较均匀地分散,黏接紧密,形成较为致密的复合涂层。
Effects of the mass fraction of nano-SiO2 on the mechanical properties of the epoxy composite paint film on the steel plate, such as the hardness, the T-bending performance and the strain were investigated in detail. The corrosion resistant properties of the paint films were measured by the salt spray test and EIS （Electrochemical Impedance Spectroscopy）. The results indicate that the performances of the composite paint film with 2.0 wt% nano- SiO2 are obviously improved in comparison with the paint film without nano-SiO2. The hardness of the composite paint film increases from H to 2H, the T-bending improves from 4T to 2T, and the anti-salt spray time improves from 720 h to 1030 h before showing blisters. The resistance of the composite paint film with 2.0% nano-SiO2 is two orders higher than that of the paint film without nano-SiO2 by EIS. Moreover, the nano-SiO2 particles disperse uniformly in the paint film characterized by SEM images.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2007年第5期13-18,共6页
Acta Materiae Compositae Sinica
基金
国家科技攻关世博科技专项项目(04DZ05803)
上海市科委国际合作项目(045207020)
关键词
纳米SIO2
涂层
硬度
T弯
盐雾
电化学交流阻抗
nano-SiO2
paint film
hardness
T-bending
salt spray
electrochemical impedance spectroscopy
