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Preparation of the Composite Coatings on the Carbon Steel Surface and Their Anticorrosion Properties in Seawater

Author: WangJianFei
Tutor: TianJinTao
School: Ocean University of China
Course: Materials Physics and Chemistry
Keywords: carbon steel composite coating seawater anticorrosion proprety
CLC: TG174.4
Type: Master's thesis
Year: 2011
Downloads: 113
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Abstract


Nowadays, carbon steel has been widely used in the areas of sea, and the more attention is paid for the problem of corrosion for steel materials in the seawater. Because the traditional anticorrosion method was limited to use in environment of ocean, and was easy to cause severe environmental pollution, the study of new marine anticorrosive material with ability of convenient, practical, economic, environmental protection has become one of the hottest topics.The Ni-P and Ni-P-PTFE coatings with various PTFE contents were electroless deposited on carbon steel and characterized through XRD, SEM, EDS, polarization curve and EIS. As a result, the microstructural morphologies of the coatings significantly varied with the PTFE content. The electrochemical anticorrosion capabilities of the coatings were seriously decreased with the increase of the PTFE content. The coating with a trace PTFE （PTFE emulsion concentration of 0.2mL/L in the plating bath） possessed excellent anticorrosion both in sterilized and unsterilized seawater which has been attributed to the absence of nano pores successfully blocked by the incorporated trace PTFE nano particles. Moreover, the process of sterilizing for seawater also affected the anticorrosion property of the coating.Before preparing the TiO2/ZnO composite coating by sol-gel process, the study on photocatalytic activity of powder from the TiO2/ZnO composite sol was conducted. The as-prepared composite powder was characterized in detail using TGA, XRD, SEM, HRTEM and FTIR. The results showed that the particle crystallization of the composite powder was significantly promoted with the increase of the calcining temperature and the anatase was transformed to rutile during heating process. In addition, the reaction between TiO2 and ZnO occurred when temperature increasing. However, the phase transformation and reaction mentioned above had been successfully retarded via the ammonia treating process. The particle crystallization of the composite powder was significantly promoted with the increase of the calcining temperature. The photocatalysis evaluation through MO degradation revealed an enhanced photocatalytic activity for the composite powder that might be related to the good crystallization, the presence of anatase phase, and the particle size reduction of the powder.Then, the TiO2/ZnO composite coatings were prepared on carbon steel via sol-gel process and the as-prepared coatings were characterized by XRD, SEM, EDS, polarization curve and EIS. The results showed that the TiO2/ZnO composite coatings were more compact than pure TiO2 coating. The matrix was oxidized after heating process and the reaction occurred between oxide and ZnO contained in coatings. The electrochemical anticorrosion capabilities of TiO2/ZnO composite coatings varied with the heating temperature. The increasing for the thickness of coatings could improve the anticorrosion capabilities.

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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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