INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Sulfate Corrosion Resistance of h-BN Based Composite Ceramic Coatings for Boiler Heating Surface |
MA Xiaobo, WANG Jinqing, CHI Zuohe, ZHANG Guangxue, ZHAN Mingxiu
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College of Metrology & Measurement Engineering, China Jiliang University, Hangzhou 310001 |
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Abstract Sulphate corrosion is commonly occurred on the heating surface of coal-fired boiler. To address this problem, h-BN based composite ceramic coating was prepared on the surface of 20CrMn steel sheet by slurry method. Then, the thermal shock resistance, porosity and abrasive resistance of the coating were analyzed, and the sulfate corrosion resistance of the uncoated and ceramic-coated steel sheets at 350—450 ℃ was investigated. The experimental results showed that the coated samples exhibit favorable thermal shock resistance, low porosity and similar wear resistance to the substrate. The corrosion test data were processed by employing thermal analysis kinetics, and the corrosion mechanism of both uncoated and coated samples was found to be in accordance with the second order phase interface reaction. It could be seen from the calculation results that the activation energy of coated sample (2 200.217 J·mol-1) was higher than that of uncoated one (1 431.172 J·mol-1), indicating that the sulfate corrosion resistance of coated sample was superior to the uncoated one. After corrosion test, the appearance, composition and phase of the samples were analyzed. The results showed that there was only a small amount of sodium sulfate (Na2SO4) crystal grains forming on the surface of the coating, while Na2SO4 was not detected in the interior of the sample. It turns out that the spraying coatings contributed to preventing the substrate material from the sulphate corrosion.
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Published: 03 April 2019
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Fund:This work was financially supported by Research Program of the Ministry of Education of Zhejiang Province (Y201534242) and Public Welfare Technology Application Research Program of Zhejiang Province(2017C31043). |
About author:: Xiaobo Ma began to study as a postgraduate in China Jiliang University since September 2015. Jinqing Wang received his Ph.D. degree in enginee-ring thermophysics from University of Shanghai for Science and Technology in 2018. |
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