A self-adjusting PTFE/TiO2 hydrophobic double-layer coating for corrosion resistance and electrical insulation
By Wang, Shuqi; Wang, Yaming; Zou, Yongchun; Wu, Yunfeng; Chen, Guoliang; Ouyang, Jiahu; Jia, Dechang; Zhou, Yu
Published in Chemical Engineering Journal
Chemical Engineering Journal
2020
Abstract
The self-adjusting polytetrafluoroethylene (PTFE)/TiO2 organic-inorganic double-layer coatings are designed on titanium alloy using thermal field and gradient pressure field enhanced plasma electrolytic oxidation (TGEPEO), which leads to the in-situ incorporation of PTFE nano-particles into the bottom TiO2 ceramic coating. The PTFE top layer with adjustable thickness is strongly bonded on a TiO2 bottom porous layer by subsequent deposition, chemical bonding and crosslinking curing of PTFE nanoparticles during TGEPEO process. Simultaneously, the double-layer coating possesses promising self-cleaning function due to a special hydrophobic surface with a water contact angle of ?138.0