The aim of this study was to develop a method to
prepare WO3-TiO2 film which has high anticorrosion
property when it was coated on type 304 stainless steel. A series of WO3-modified
TiO2 sols were synthesized by peroxo-sol gel method using TiCl4 and Na2WO4 as the starting materials. TiCl4 was converted to Ti(OH)4 gel. H2O2 and Na2WO4 were added in Ti(OH)4 solution and heated at 95°C. The WO3-TiO2 sol was transparent, in neutral (pH~7) solution, stable suspension without
surfactant, nano-crystallite and no annealing is needed after coating, and very
stable for 2 years in stock. WO3-TiO2 sol was formed with
anatase crystalline structure. These sols were characterized by XRD, TEM, and
XPS. The sol was used to coat on stainless steel 304 by dip-coating. The
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