Coating Fabrication of Nano-Sized Oxides/Metal Composite by Warm Spray and its Photo-Cathodic Protection Behaviour

概要

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By putting photo-electric conversion materials and electron storage materials together on one device, full-time cathodic protection system was expected to function and its coating technique is required to realize the system. So far, Warm Spray, impact deposition of supersonic particle with temperature controllable in a wide range, enabled nano-sized TiO2 and Fe2O3 to be deposited controlling thermal degradation of the particles and it was revealed that each of photo-electric conversion and electron storage were functioned. The rest potential of the coatings as an indicator of overall system performance was not negative sufficiently, which might be related to the less conductive nature. Therefore, metallic Zn was introduced in this paper for shifting the rest potential to more negative direction and increase of the conductivity. The coatings were successfully fabrication with control of thermal degradation of Zn, which worked as a binder to connect the oxide particles. Photo-cathodic protection behaviour indicated that the steady rest potential of the Warm Sprayed coatings of the TiO2-Fe2O3 system was not influenced on the introduction of metallic Zn, implying that it might not be limited by the conductive property of the coatings.