A Research Of Secondary Corrosion Of C6-Fluoroketone

As a new type of halon substitute fire extinguishing agent,C6-Flouroketone has the advantages of high efficiency,cleanliness and environmental friendliness.It has gradually become the most popular clean fire extinguishing agent in the world and has been widely used in developed countries.Because the promotion of ketone is relatively late and the understanding and technical preparation are insufficient,it has not been widely used so far.The stability of common metal and non-metal materials in C6-Flouroketone has not been studied experimentally.The selection of storage materials and contact materials for C6-Flouroketone lacks the support of experimental data support.In this paper we will design a specific pressure vessel used for the corrosion experiment and study theoretical analysis of the corrosion of different materials in perfluorohexanone.The corrosion of C6-Flouroketone to common metal and non-metal materials under different moisture content,pressure and temperature conditions is experimentally studied,then we also calculate the corrosion rate and mechanical properties of the materials,and confirm with the theory,tne experimental results can provide theoretical support for the selection of storage materials for C6-Flouroketone and the selection of some materials in the fire extinguishing system.The main contents of and the research progress in this paper include:1.Theoretical analysis of the hydrolysis reaction of C6-Flouroketone was studied,analysis of the reactivity and electrochemical corrosion mechanism of C6-Flouroketone or its hydrolysate and common metals、non-metals,which confirmed with the experimental results for each other;2.a corrosion resistant pressure vessel required for this experiment was calculated and designed;3.Corrosion experiments of 304 stainless steel,galvanized iron,copper and aluminumhas been studied,we calculated the corrosion rate,and studied change rules of mechanical properties of each material.The results show that the moisture content and temperature have the greatest influence on the corrosion of metal materials,the corrosion of galvanized iron is the most serious,the corrosion rate is the largest,and the mechanical change is the most.Obviously,the elongation after fracture is reduced;stainless steel is the least corrosive and is a suitable storage material;4.To study the corrosiveness of C6-Flouroketone on three kinds of non-metallic materials such as polypropylene,high-density polyethylene and carbon fiber under different water content,pressure and temperature conditions,and swelling ratios of five kinds of non-metal gasket materials:the natural rubber、silicone rubber、fluororubber、polytetrafluoroethylene and polyurethane rubber were also studied.The results show that when the temperature and water content increase,the elongation of polypropylene decreases after breaking,and the moisture content has little effect on high density polyethylene,which is suitable for use as C6-Flouroketone storage material at room temperature.Increasing the water content and temperature will cause the C6-Flouroketone to reduce the tensile strength of the carbon fiber material.And polyurethane rubber has the highest swelling rate in C6-Flouroketone and the smallest is natural rubber.