Fouling and Corrosion Properties of SiO2 Coatings on Copper in Geothermal Water

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• 作者：Chen Ning ; Liu Mingyan ; Zhou Weidong
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2012
• 出版时间：May 2, 2012
• 年：2012
• 卷：51
• 期：17
• 页码：6001-6017
• 全文大小：1186K
• 年卷期：v.51,no.17(May 2, 2012)
• ISSN：1520-5045

文摘

Two critical problems in geothermal utilization are corrosion and fouling on the surfaces of plants and fittings, and use of surface coatings is a good method to overcome such difficulties. Silica coatings with film thickness of several hundred nanometers on copper substrates were prepared by the liquid-phase deposition technique and characterized with respect to surface morphology, composition, surface free energy, roughness, and film thickness. Examinations of both fouling in calcium carbonate solution and corrosion in corrosive geothermal water on the surfaces of SiO₂-coated samples were performed. The results showed that the fouling rate on the SiO₂-coated surface was obviously reduced compared with that on the polished surface. Moreover, the inhibition of corrosion on the modified surface was found even though, after a long immersion time, the corrosion resistance action decreased because of the surface peeling of SiO₂-coated samples. The corrosion behavior of the SiO₂ coating was further studied with electrochemical measurements by electrochemical impedance spectroscopy. This work suggests a new possibility for solving the fouling and corrosion issues encountered in the use of geothermal water.