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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2019, Vol. 33 
