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Study on the Silanization Treatment of Aluminum Alloy and Magnesium Alloy

Author: XuYiBing
Tutor: HeDeLiang
School: Hunan University
Course: Applied Chemistry
Keywords: Dual -1,2 - [ 3 ( triethoxysilyl ) silylpropyl ] tetrasulfide Silane Films Aluminum Magnesium alloy Electrochemical assisted deposition Surfactants
CLC: TG174.4
Type: Master's thesis
Year: 2008
Downloads: 588
Quote: 4
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Abstract


Metal silanized metal corrosion protection in recent years, the rapid development of the field is expected to replace chromate up a green type processing technology. The technology is based on the hydrolysis of the silane molecule and the metal oxide can silanols reactions and condensation of the silane molecules themselves form an inorganic / organic layer characterized to dipping assisted deposition method or electrochemical preparation of the metal surface layer with hydrophobic properties. This film not only on the metal substrate to provide protection, but to improve the adhesion between the metal and the coating. After silylation people continue processing technology research and development in many important results have been obtained so far, part of the technology has been applied in industry, such as galvanized steel corrosion. However, the technique is not perfect, there is the prior art thin film prepared, easily hydrolyzed, heterogeneity and other shortcomings, especially for the corrosion protection of metal lower potential difference, such as aluminum alloy, magnesium alloy, limiting the technology. This view of the current aluminum alloys, magnesium alloys difficulties silylation treatment techniques, based on the previous studies, respectively, in the silane solution is added auxiliary agent and the film deposition modifiers, film preparation conditions optimization, to improve the film thickness, compactness, improving the composition of the film structure and enhance the corrosion resistance of the film. The results are as follows: 1, the experiment at low cathodic deposition potential conditions, the surfactant-modified silane solution to achieve a double -1,2 - [3 (triethoxysilyl) silylpropyl] tetrasulfide BTSPS in electrochemical deposition of aluminum electrode surface, the new critical deposition potential (NCCP) is approximately -1.6 V. EIS impedance and polarization curves of the test results show that the modified silane solution of bis 1,2 - [3 (triethoxysilyl) silylpropyl] tetrasulfide lower surface of the aluminum alloy film is deposited cathode potential layer has a higher polarization resistance. Scanning electron microscopy (SEM) showed a low cathodic deposition of aluminum alloy surface potentials can be thicker and more dense silane layer. Silane solution of the surfactant can be reduced by adding a silane hydrogen evolution electrodeposition influence the deposition of silane to improve performance. Preparation of the lower critical silane deposition potential electrode than the critical covering aluminum deposition potential (-0.8 V) aluminum electrode covering the silane has better corrosion resistance. 2, in the immersion deposition of silane, based on the additive (B) was added to improve the chemical structure of the film. EIS impedance and polarization curves show that the incorporation of additives in the layer B can effectively improve the coating of the polarization resistance and pore resistance, enhance the corrosion resistance of the film. ATR - Fourier transform infrared spectroscopy FTIR-ATR tests showed additive, the film changes in the chemical structure, that additive has successfully doped into the silane layer. Additive B experiment, the optimal added at a concentration of 9.7%, which is prepared under conditions of magnesium alloy film has the best protective 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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