关键词: 渗氮工艺, 双氧水, 阀门, 优化, 制造, 磨损

Abstract:

At present, nitriding treatment is usually used for valve hardening in China. Nitriding process has the advantages of enhancing the service life of valve and improving the wear resistance of valve shaft sleeve. However, there are few studies on the application of the valve after pickling and passivation treatment in the production of hydrogen peroxide by anthraquinone method after nitriding process. In order to increase the research in this direction, this paper introduced several methods of nitriding the surface of valve rod and shaft sleeve, such as plasma nitriding, radio frequency nitriding, microwave nitriding, ion implantation and ion annihilation implantation, so as to increase the service life and wear resistance of valve rod and shaft sleeve. Through the overall pickling of the stem shaft sleeve of austenitic stainless steel three eccentric reducing butterfly valve after nitriding treatment, disassembly and inspection after pickling and soaking with hydrogen peroxide, the concentration, stability and iron ions of hydrogen peroxide with different soaking time were measured. According to the experimental results, it was concluded that the surface of the valve treated by nitriding process would contain a large amount of iron ions after pickling, and the existence of these iron ions would lead to the decomposition of hydrogen peroxide, reducing the concentration and stability of hydrogen peroxide, and thus it was not suitable for the production of hydrogen peroxide by anthraquinone method. Only pickling passivation treatment of the valve was more suitable since hydrogen peroxide had little impact on the application of anthraquinone process in hydrogen peroxide production.

Key words: nitriding process, hydrogen peroxide, austenitic stainless steel, optimization, manufacture, attrition