Preparation method of nitrogen (N)-doped titanium dioxide (TiO2) porous film on surface of stainless steel matrix

Abstract

The invention discloses a preparation method of a nitrogen (N)-doped titanium dioxide (TiO2) porous film on the surface of a stainless steel matrix, belonging to the field of the preparation technology of photocatalytic materials. The method is characterized by a technical scheme for preparing a high film-based bonding strength anatase type N-doped TiO2 porous film on a stainless steel matrix, and comprises the following steps of: firstly preparing a Ti-N diffusion coating layer composed of a Ti-N diffusion layer in the matrix and a surface Ti-N compound film on the surface of a stainless steel workpiece by use of a double glow plasma surface alloying technology; then performing anode oxidation on the Ti-N film on the workpiece surface to generate an N-doped TiO2 porous film; and finally performing thermal treatment in the air to prepare an anatase type N-doped TiO2 porous film. By adopting the preparation method disclosed by the invention, the prepared N-doped TiO2 porous film has the advantages of large specific surface area and good film-based bonding strength, and also has visible light catalysis performance; and the stainless steel after the N-doped TiO2 surface modification can be applied to the fields of photocatalysis self-cleaning, photocatalysis sterilization and the like.

Description

technical field [0001] The preparation method of the nitrogen-doped titanium dioxide porous film on the surface of a stainless steel substrate belongs to the technical field of photocatalytic material preparation, and in particular relates to an anatase-type N-doped TiO with high film-base bonding strength prepared on the surface of a stainless steel substrate 2 porous film method. Background technique [0002] Stainless steel materials have been widely used in food industry, office equipment, medical equipment and other fields. With the occurrence of public health events such as SARS and bird flu, people have higher and higher hygiene requirements for living environment and daily appliances. People hope that stainless steel utensils will not only have the characteristics of being stainless and clean as new, but also have functions such as antibacterial and self-cleaning, and these properties mainly depend on their surface properties. Forming a modified layer with specific ...

AI Technical Summary

Problems solved by technology

[0009] Preparation of N-doped TiO on the surface of stainless steel substrate as above 2 The problem of the thin film technology is that since the Ti-N permeated layer is formed at high temperature, the Ti-N thin film on the surface presents the characteristics of dense structure and small specific surface area, so that the N-doped TiO produced by oxidation 2 The thin film also exhibits the same structural characteristics, and the small specific surface area of ​​the thin film is not conducive to the improvement of its photocatalytic performance.