Journal
CHEMICAL ENGINEERING JOURNAL
Volume 402, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.126116
Keywords
TGEPEO; PTFE/TiO2; Hydrophobicity; EIS; Long-term chemical stability; Electrical insulation
Categories
Funding
- NSFC [51571077, 51621091]
- National Basic Science Research Program [2012CB933900]
- Aviation Science Foundation of China [20163877014]
- Fundamental Research Funds for the Central Universities [BRETIII.201202]
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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 +/- 4.4 degrees caused by self-adjusted surface micro-nano structure. Moreover, the PTFE/TiO2 double-layer coating exhibits excellent corrosion resistance and high electrical insulation. More importantly, the microstructure of the double-layer coating underwent self-adjustment in long-term immersion, caused by the accumulation-redeposition of corrosive ions and the closure of the reticular microchannels at the damaged regions, thus enhancing long-term chemical stability.
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