Preparation of ZnWO₄/TiO₂ composite film and its photocathodic protection for 304 stainless steel under visible light

Abstract

ZnWO₄/TiO₂ composite films were fabricated on TiO₂ substrate by hydrothermal method. The ZnWO₄ nanorods-sensitized TiO₂ coupled with 304 stainless steel was served as photoelectrode to study its anticorrosion effect for metal. Under visible light, the photocathodic protection ability of TiO₂ and ZnWO₄/TiO₂ composite film was measured by photoelectrochemical program on potentiostat. Open circuit potential variation result showed that sanmartinite ZnWO₄ nanorods could enhance the photoelectrochemical activity of TiO₂, and the ZnWO₄/TiO₂ composite films could absorb energy and store electrons to play a role in corrosion protection for metal.