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Preparation and Characterization of Anti-corrosion Film on SUS304 Stainless Steel in Aqueous LiBr Solution at High Temperature

Author: ChenHongXia
Tutor: MaXueHu
School: Dalian University of Technology
Course: Chemical Engineering
Keywords: High Temperature Corrosion and Protection LiBr solution Improve the hydrothermal synthesis method Inorganic composite silicon film Organic compound silicon film
CLC: TG174.45
Type: PhD thesis
Year: 2009
Downloads: 177
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Abstract


Been widespread concern in the face of relatively low status of energy consumption by increasing energy efficiency, using a second type of absorption heat pump low-grade waste heat to a higher grade, in order to achieve the waste heat recycling technology. Absorb the high temperature of the working fluid-LiBr solution corrosion to limit the scope of the application of heat pump technology, is one of the key technologies of Absorption Heat Pump, this article will focus Absorption Heat Pump and corrosion protection. Choose not to add any corrosion inhibitor of LiBr solution investigated Corrosion behavior of SUS304 austenitic stainless steel at 150 ~ 200 ℃ LiBr solution. The results showed that in a high temperature environment, LiBr solution concentration are the main factors affecting the concentration of dissolved metal ions in the etching rate and the solution; also found in the state of corrosion in the high temperature and high concentration of LiBr solution, SUS304 stainless steel pitting transformed into a film corrosion exists the evolution and analysis of the the corrosion state transition mechanism. Deposition of the original based on the stainless steel in high temperature and high concentration of LiBr solution, by the pitting a membranous corrosion transition law, using the improved hydrothermal synthesis method, the preparation of the sparingly soluble inorganic silicon film forming solution added to the solution, in the corrosion system, edge corrosion edge Bit preparing a new type of inorganic compound silicon film. Through the characterization of its structure and properties, it is confirmed that the compound silicon film layer is mainly composed of two parts: stainless steel corrosion generated in the metal oxide and the solution was dissolved and simultaneously deposited onto the silicon surface of the sample network structure in the etching solution. Inorganic silicon dissolved in the hot alkali and by dehydration condensation reaction with the metal oxide and the sample matrix key cooperation with composite silicon film formed on the specimen surface and the two parts do not exist independently. Formed by the dehydration condensation of the-Si-O-Fe-Si-Fe bond, makes the film more dense and enhanced combination, can significantly improve the corrosion resistance. SiO 2 particles is an inorganic silica source, were prepared in the LiBr solution inorganic composite silicon film. LiBr solution concentration, pH of the solution, as well as film-forming time of the preparation of the of inorganic composite silicon film corrosion resistance corrosion system by examining the added amount of Si process parameters optimized. Determining the optimum deposition process parameters: the amount of Si added was 29ppm, and the pH value was 10.6, and the solution concentration of 57.8%. The film was prepared in the pitting potential of 0.75V, the free corrosion potential of 0V, the contact angle of 69 °, having a certain degree of hydrophilicity and good corrosion resistance. Selection of bi-functional siloxane 1,2 - (methyl diethoxy silicon) of ethane (BMBSE) as raw material, SUS304 stainless steel substrate surface using the Czochralski method successfully prepared by a bi-functional siloxane BMBSE Organic silicon film. The test results showed, the dual functionality BMBSE silicon film having a-Si-O-Fe, Si-O-Si-network structure, improved film density and binding force, significantly improves the corrosion resistance of SUS304 stainless steel. According the structure of BMBSE and analysis of the formation mechanism, the hydroxyl content of TEOS BMBSE film improved to improve the composite film-Si-O-Fe, Si-O-Si of bonding density, the film structure more dense, corrosion resistance is further enhanced. Finally examine the impact of various film-forming factors on the performance of composite silicon film to obtain the optimal film-forming solvent ratio.

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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 > Inorganic complex layer of protection
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