The Study On Preparation And Properties Of TiO₂ Coating On Stainless Steel

Photo-catalytic TiO2, as an environmentally-friendly material, has a promising prospect of application in many areas, such as sewage disposal, air purification, antisepsis, antifog and self-cleaning. Stainless steel is widely applied in many fields because of its excellent physical property. This study adopts 316 stainless steel as base material, on whose surface the TiO2 coating is prepared successfully. Then, varies of coating's properties like adhesion, photo-catalysis property, water affinity, corrosion resistance are examined.TiO2 prepared from Ti(OC4H9)4 is calcined at different temperatures from 300 to 800℃, and the range of temperature at which crystal transformation occurs is investigated by X-ray diffraction. The result shows that the transformation from anatase to rutile occurs at the temperature between 600 to 800℃, providing evidence to the fact that the coating of anatase with perfect adhesion can be prepared by sintering at relatively low temperature。Property of adhesion of the coating prepared from PEA and anatase are affected by the respective contents of them. When the content of PEA is 10ml/100ml, the adhesion and evenness of the coating is optimum; the higher the content of TiO2, the poorer of the adhesion. Moreover,TiO2 coating prepared by this method shows no obvious photo-catalysis, but shows some water affinity. And the content of TiO2 is not a decisive factor of the performances.On the TiO2 coating prepared from PEA and anatase, the thicker of the coating, the more cracks are and the poorer compactability is. The content of TiO2 is increasing. When the number of the lifting is 7,photo-catalysis of the coating arrives optimum. When the number of lifting is 5,water affinity of coating shows best. Furthermore, Ag+ doping is added to the TiO2 sol, with the increasing content of Ag+ doping, grains of Ag begin to agglomerate and enwrap the grain of TiO2. When the content of Ag+ doping is 10%, the content of Ag in coating is highest. The Ag+ doping can not substantially affects the photo-catalysis of coating but can decrease the water affinity of the coating.Electro-chemical corrosion test shows that the TiO2 coating prepared by both method mentioned in this paper can enhance the corrosion resistance of 316 stainless steel and can help to protect the base。...