h-BN基复合陶瓷涂层防锅炉受热面的硫酸盐腐蚀性能

doi:10.11896/cldb.201906009

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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.

Key words： coal-fired boiler slurry method h-BN based composite ceramic coating sulfate corrosion thermal analysis kinetics

Published: 03 April 2019

CLC number:

TK08

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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	MA Xiaobo
	WANG Jinqing
	CHI Zuohe
	ZHANG Guangxue
	ZHAN Mingxiu

Cite this article:

MA Xiaobo,WANG Jinqing,CHI Zuohe, et al. Sulfate Corrosion Resistance of h-BN Based Composite Ceramic Coatings for Boiler Heating Surface[J]. Materials Reports, 2019, 33(6): 960-964.

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http://www.mater-rep.com/EN/10.11896/cldb.201906009 OR http://www.mater-rep.com/EN/Y2019/V33/I6/960

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