Wang Fangfang, Feng Lajun, Li Guangzhao
School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China.
Key Laboratory of Corrosion and Protection of Shaanxi Province, Xi'an 710048, China.
Polymers (Basel). 2018 Dec 19;10(12):1406. doi: 10.3390/polym10121406.
Because flammable organic solvents are emitted during the construction process, oil-based conductive coatings generally result in potential safety problems. A high content of conductive mediums can also weaken the adhesive and protective abilities of existing conductive coatings. Therefore, an anticorrosive and conductive coating was prepared on Q235 steel substrate by spraying the multi-walled carbon nanotubes (MWCNTs)/waterborne polyurethane (WPU) dispersion with a low MWCNT content in this work. The effect of the MWCNT content on the electrical conductivity, corrosion resistance, and adhesive strength of the WPU conductive coating was investigated. It was concluded that a spatial network structure of MWCNTs-WPU was formed to make the coating structure more compact. The electrical conductivity, corrosion resistance, and adhesive strength of the WPU conductive coating first increased and then decreased as the MWCNT content increased. When the MWCNT content was only 0.2 wt % (which was far lower than that of the existing conductive coatings at 1 wt %), the coating began to conduct electricity; its resistivity was 12,675.0 Ω·m. The best combination property was the 0.3 wt % MWCNTs/WPU conductive coating. Its adhesive strength was 19.99% higher than that of pure WPU coating. Its corrosion rate was about one order of magnitude lower than that of pure WPU coating after being immersed in 3.5 wt % NaCl solution for 17 days.
由于在施工过程中会排放易燃有机溶剂，油性导电涂料通常会导致潜在的安全问题。高含量的导电介质也会削弱现有导电涂料的附着力和保护能力。因此，在本工作中，通过喷涂低含量多壁碳纳米管（MWCNTs）/水性聚氨酯（WPU）分散体，在Q235钢基体上制备了一种防腐导电涂料。研究了MWCNT含量对WPU导电涂料的导电性、耐腐蚀性和附着力的影响。结果表明，MWCNTs-WPU形成了空间网络结构，使涂层结构更加致密。随着MWCNT含量的增加，WPU导电涂料的导电性、耐腐蚀性和附着力先升高后降低。当MWCNT含量仅为0.2 wt%（远低于现有导电涂料的1 wt%）时，涂层开始导电，其电阻率为12675.0Ω·m。最佳综合性能的是0.3 wt%的MWCNTs/WPU导电涂料。其附着力比纯WPU涂料高19.99%。在3.5 wt%NaCl溶液中浸泡17天后，其腐蚀速率比纯WPU涂料低约一个数量级。
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