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Fabrication of Hybrid Films with the Low Surface Energy on Metallic Substrates and Research on Anti-corrosion Properties

Author: ChenYan
Tutor: ChenShouGang
School: Ocean University of China
Course: Materials Science
Keywords: Copper Dodecanethiol 304 stainless steel Dopamine Corrosion resistance
CLC: TG174.4
Type: Master's thesis
Year: 2010
Downloads: 205
Quote: 5
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Abstract


Metal corrosion has brought huge economic losses and harm to the social development, with the industrial and scientific and technological development, Corrosion Science share in the national economy is becoming more and more important. Corrosion and Protection of metallic materials related to the sustainable development of the entire national economy and the people's livelihood and the economy. Is well known, the beginning of the process of metal corrosion occurs primarily at the interface of the metal and the environment, therefore it is possible to slow down or prevent the occurrence of metal corrosion on the metal surface processing, so as to achieve the purpose of anti-corrosion. The paper dodecanethiol hydrophobic membrane with n-dodecyl mercaptan and 14 acid superhydrophobic hybrid film was prepared on a copper substrate, by means of scanning electron microscopy, spectroscopy, contact angle measurements and other means of super-hydrophobic surface were characterized, the study found that the formation of a single n-dodecyl mercaptan film is uniform and beautiful sheet submicroscopic structure, the contact angle of 150 °, but adding myristate formed of dodecanethiol / 14 acid mixed The film is more uniform and dense, the contact angle is greater for the 160 °. Use of polarization curves, electrochemical impedance spectroscopy (EIS) study generated on the surface of the copper dodecanethiol superhydrophobic film and dodecanethiol / 14 acid corrosion resistance of the hybrid film, the test results show that the regular dodecahedron sulfur alcohol super-hydrophobic film on the copper substrate has good corrosion resistance and better dodecanethiol / 14 acid hybrid film, in addition, also with the Gaussian (R) 03 package of the regular dodecahedron sulfur alcohol with 14 acid in copper adsorption behavior, with competition theory has a good explanation of the mixed film is denser and better corrosion resistance. The above-mentioned defects of the film is adsorbed on the copper substrate is unstable and easier to fall off. In recent years, the biological secreted by the marine mussel mussel adhesive protein still has a strong cohesive force in a wet environment caused widespread concern. A cohesive effect in the process of bonding the catechol group having a catechol group of dopamine, thereby firmly adsorbed on the metal substrate, in addition, the adsorption of dopamine cladding layer can still allow the mercapto group-containing (-SH) and amino group (-NH2) of the organic matter further bonded, which for the second reaction to provide a reaction platform. Therefore, for the aforementioned shortcomings, we use the more readily adsorbable the Dopamine film-coated, thus having corrosion resistance of the n-dodecyl mercaptan film stable adsorption on a copper matrix. Tested by X-ray photoelectron spectroscopy, scanning electron microscopy and spectroscopy analysis showed that dopamine has been successfully adsorbed onto a copper substrate, and dopamine polymerization by Schiff base and the addition reaction so that is 10 thiol film adsorbed to dopamine coated copper matrix, this reaction procedure is similar to the self-assembly process of the mercaptans react with a noble metal. The contact angle measurements show that when the dopamine adsorption, the copper surface is strong hydrophilic, while the n-dodecyl mercaptan coated with dopamine copper matrix is ??formed, the strong hydrophobic due to the presence of the alkane chain . Potentiodynamic polarization and electrochemical impedance spectroscopy were formed film corrosion resistance test, the test results show that dodecanethiol dopamine formed on the copper substrate coated with effective inhibition of copper corrosion. While taking advantage of the stability tests proved dopamine assist in the formation of n-dodecyl mercaptan film is quite stable, and therefore better able to inhibit the infringement of Cl-in seawater. In order to show the versatility of this approach, as another study in 304 stainless steel with of copper different types of metal, n-dodecyl mercaptan film adsorbed to the dopamine-coated 304 stainless steel substrate, X-ray photoelectron spectroscopy test, characterization of atomic force microscopy and contact angle measurements showed that n-dodecyl mercaptan really dopamine 304 stainless steel substrate coated with the adsorption and electrochemical measurements (potentiodynamic polarization curves, electrochemical impedance spectroscopy) results show that the regular dodecahedron The adsorption of thiol film effectively inhibit the corrosion of 304 stainless steel.

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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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