Preparation And Application Of Stainless Steel Based Silicon Oxide Functional Ceramic Coating

304 stainless steels are widely used in tableware,industrial,aerospace,ships and other different industries because of its good mechanical properties,corrosion resistance,and low prices.However,in the practical application process,environmental corrosion and deformation of the material led to short life of stainless steel products,a serious waste.Therefore,the modification of stainless steel material to improve the efficiency of the use of materials is of great significance.In this paper,the modification of the surface of stainless steel and the special function of coating are studied.Specific research work is as follows:Ceramic coatings were prepared by slurry method according to the exploration of the basic glaze formula:SiO₂-B2O₃-CaF2-NiO、SiO₂-B2O₃-CaO-ZnO and SiO₂-TiO₂-MgO-NaSiF6.SiO₂-B2O₃-CaF2-NiO is the bottom glaze whose firing condition was sintering at 820℃ for 5 min,SiO₂-B2O₃-CaO-ZnO is the non-titanium glaze whose firing condition was sintering at 820℃ for 5min and SiO₂-TiO₂-MgO-NaSiF6 is the titanium white glaze whose firing condition was sintering at 850℃ for 5min.In the study of the effect of the admixture clay on the properties of SiO₂-TiO₂-MgO-NaSiF6 glaze,5%,7%,10%,12%,15%clay were added to the glaze.The results showed that the apparent performance of the coated samples was the best when the clay content is 7%.When applying the SiO₂-TiO₂-MgO-NaSiF6 glaze to the stainless steel insulation cup,the two coating and two sintering process can improve the apparent performance of the ceramic coating.The surface of SiO₂-TiO₂-MgO-NaSiF₆ ceramic coating is smooth,and the coating is milky white.Coating performance test showed that the hardness was higher than 100HRC.The results showed that SiO₂-TiO₂-MgO-NaSiF6 ceramic coating behaved no peeling and swelling after water corrosion for 168 h.The coating was also subjected to the concentration of 0.536mol/L alkaline solution for 168 h without peeling.The coating exfoliated after corrosion in 3 vol%hydrochloric acid solution for 11h.The above phenomenon indicated that the SiO₂-TiO₂-MgO-NaSiF6 ceramic coating had a good resistance to water and alkali,but poor acid resistance.The SEM and EDS analysis of the coating showed that the bond between the coating and the substrate was mainly physical bonding and accompanied by weak chemical adhesion.The effects of B₂O₃,BaO,SnO₂,SrO and Li20 on the properties of SiO₂-TiO₂-MgO-NaSiF6 ceramics coating were studied.The apparentperformance of the coating was the best with the addition of 7%B2O₃.The adding of BaO,SnO₂ and Li2O leads to a poor coating performance.SrO can improve the flatness of the coating surface,but the gloss and whiteness of the coating are reduced.XRD analysis and infrared spectroscopy analysis of SrO glazes were carried out.When the addition of SrO were more than 10%,the crystal phase appeared in the glaze,and the crystal phase was Sr2Si04.At the same time,the corresponding characteristic peaks appeared in the infrared spectrum of the glaze,It is concluded that Sr2+ in the tetrahedral network structure is mainly to destroy the network structure.In this paper,methyl orange was decomposed by glaze,and the absorbance of methyl orange was measured.The results showed that the glaze had antibacterial properties.Hydrophobic properties of Surfactant-treated T7 glaze exceeded the import glaze.The wetting angle can reach 131°。The results showed that the encapsulation of surfactants improves the dispersibility and fluidity of the glaze,and the surface gloss of the samples was improved after firing.The coating of the hydrophobic agent on the coating revealed that the coated glaze had better hydrophobic properties than the others,improved the dispersibility and fluidity of the glaze,and also improved the surface gloss of the sample after firing.The SiO₂-TiO₂-MgO-NaSiF₆ glaze and the imported glaze were modified by TiN and Si3N4.Simultaneously,ceramic coating with non-stick performance was prepared on the inner surface of the stainless steel pot.The results showed that the performance of the imported glaze was better than that of the SiO₂-TiO₂-MgO-NaSiF6 glaze.When the addition amount of TiN was less than 10%,the non-stick coating was etched in the concentration of 0.536mol/L alkaline solution for 120h,and it’s the weight loss percentage was close to 0%.When etched by the volume fraction 3%hydrochloric acid solution for 120h,and the same coating weight loss percentage was close to 0%.