Dissertation
Dissertation > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Various types of metal corrosion > Inorganic corrosion

The Influence of the Modified Interface between SiO2 and Epoxy on the Corrosion Resistance of Coating in NaC1 Solution Environment

Author CuiYu
Tutor ZhangTao;LiZuo;LiuLi
School Harbin Engineering University
Course Materials Science
Keywords Organic coatings Corrosion resistance Transmission Hydrostatic pressure
CLC TG172.6
Type Master's thesis
Year 2011
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This article in SiO2 / epoxy interface different combination of corrosion resistance coating with a focus on selected varnish, add the normal SiO2 and add epoxy polyamide coating of the surface modification of SiO2 as the research object for the marine environment Features selected atmospheric and high hydrostatic pressure in two different experimental environment, the use of electrochemical impedance, Quality Law test, adhesion test method and the mechanical properties of the coating itself at atmospheric pressure and high hydrostatic pressure of the three coating failure process in both environments Ji exhibition system. Analyzed the effect and mechanism of SiO2 / epoxy interface different combination of corrosion resistance of the coating in both environments. Surface marine environment, chemical modification can be improved to the case of SiO2 / epoxy binding at the interface, ease SiO2 agglomeration and to improve the denseness of the coating to inhibit the accumulation of an aqueous solution of SiO2 / epoxy interface at, thus improving the coating the ability to block. The coating SiO2 / epoxy interface chemically modified so that the corrosion of the metal substrate is suppressed, improved wet adhesion of the coating. SiO2 / epoxy interface chemical modification of the coating by improving performance and adhesion of the arrest, delaying its failure to effectively improve the protective ability of the coating. The deep-sea environment, the coating failure in the role of hydrostatic pressure to speed up the process, and transfer phase of the hydrostatic pressure of the aqueous solution is obvious. Hydrostatic pressure does not change the form of aqueous solution in the coating diffusion, and still meet the Fick diffusion. Aqueous solution under high hydrostatic pressure environment in the coating significantly speed up the rate of diffusion, diffusion capacity is significantly enhanced. The hydrostatic pressure to promote the corrosion of metal matrix during the reaction carried out. Wet adhesion of the coating in the environment of high hydrostatic pressure loss faster, greater corrosion tendency to peel. Aqueous solution in the reaction process intensifies the coating diffusion process to speed up and coating / metal interface, the failure of the coating process accelerated. High hydrostatic pressure environment, the capacitance method can be used to study the transmission behavior of the aqueous solution in the coating, and good reliability. Use electrochemical impedance fractal technology can be to a certain extent reflect the coating / metal interface and coating the surface morphology. Deep sea environment, traditional physical binding SiO2 / epoxy interface increases the gap at the interface, so that the diffusion speed of the hydrostatic pressure under the action of an aqueous solution, enhanced diffusion capacity. Block the ability of the coating decreased, thereby affecting the protective properties of the coating. SiO2 / epoxy interface chemical modification can effectively improve the interface performance, i.e., physical defects and chemical characteristics, increasing the diffusion of the aqueous solution of the difficulty of reducing its diffusion speed, making the coating block enhanced, thereby improving the protective properties of the coating.

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