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Study on the Preparation of Inert Oxide Films on Stainless Steel Surface and Anti-Coking Performance

Author: LiuQiaoMei
Tutor: ZhangShouChen
School: Dalian University of Technology
Course: Chemical processes
Keywords: Aviation kerosene Coke Sol - gel
CLC: TG174.4
Type: Master's thesis
Year: 2011
Downloads: 75
Quote: 0
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Abstract


Endothermic fuel cooling air engine hot parts, is an effective way to improve engine performance. The endothermic fuel on the one hand powered aircraft, on the other hand, the heat exchanger as a coolant and high temperature components. Rising the fuel temperature after the heat exchanger, is conducive to atomization and combustion in the combustion chamber. Pipeline road due to prolonged direct contact with the high-temperature fuel, wall coking phenomenon. Coking generate heat exchanger and fuel system of the engine will cause harm. Therefore, how to effectively inhibit the metal surface of the fuel is coke having significance. Aviation fuel coking reaction is divided into caused by dissolved oxygen oxidation of coke and metal catalytic cracking coke. In this study, aviation kerosene as raw material, the first use of chemical analysis method for the determination of the dissolved oxygen content. The iodometric method the basic principles of research applicable to aviation kerosene dissolved oxygen methods of chemical analysis, the kerosene dissolved oxygen content of 68.84mg/kg. By sol - gel method in the Air Materiel SS304 stainless steel substrate surface preparation SiO2 film as the precursor to TEOS modified with a silane coupling agent. The effects of pH, the amount of additives, the amount of solvent, the amount of water and temperature on the stability and coating of silica sol. Scanning electron microscopy (SEM) and energy spectrum analysis (EDS) to 500 ° C heat treatment after coating characterization results showed that the sol - gel method prepared in the stainless steel substrate surface is smooth and closely bonded to the substrate layer SiO2 film prepared multilayer SiO2 film may completely cover the substrate, but there are cracks in the surface of the outermost portion is easy to fall off. By sol - gel method silica-alumina composite coatings prepared on the surface of the stainless steel substrate, aluminum isopropoxide and aluminum nitrate as the aluminum source, TEOS as the silicon source. Experimental study of the hydrolysis temperature, the amount of water and glue amount of solvent used in the process of aluminum isopropoxide preparation of alumina sol. Characterized by SEM and EDS analysis showed that the aluminum isopropoxide as the aluminum source, SiO2-Al2O3 composite coatings prepared on a stainless steel substrate is smooth and uniform. Aluminum nitrate as the aluminum source, TEOS as the silicon source, Preparation of SiO2, Al2O3 molar ratio of 2:1, silica-alumina composite coating composition are different from the size of the island-shaped surface of the coating there is a gap, not continuous. The uncoated stainless steel substrate and the coated specimens in kerosene cracker anti-coking test, to ScS kerosene pyrolysis coke by pyrolysis temperature, reaction time and the flow of kerosene. Coking test experimental data coating aviation kerosene under high temperature pyrolysis coke has played an inhibitory effect, aviation kerosene flow 0.15ml/min temperature of 600 ° C cracking 5h, multi-layer SiO2 film surface to reduce the amount of coke 28.5% . SEM and EDS characterization results show that the morphology of coke, stainless steel surface oxide coating on the coking reaction play the role of the barrier layer, sol - gel prepared by multi-layer SiO2 film passivated metal surface anti-coking effect.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Metal surface protection technology
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