New supersonic arc spraying coating for boiler water wall protection

doi:10.13251/j.issn.0254-6051.2020.04.039

Heat Treatment of Metals ›› 2020, Vol. 45 ›› Issue (4): 183-187.DOI: 10.13251/j.issn.0254-6051.2020.04.039

• SURFACE ENGINEERING • Previous Articles Next Articles

New supersonic arc spraying coating for boiler water wall protection

Meng Dianwu¹, Zhang Jiantang¹, Shen Nan¹, Hu Xuefei^2,3, Lu Yu⁴, Du Xiaodong⁴

1. Jiangsu Datang Internationgal Lvsigang Power Generation Co., Ltd., Nantong Jiangsu 226246, China;
2. Datang Boiler and Pressure Vessel Inspection Center Co., Ltd., Hefei Anhui 230088, China;
3. East China Branch, China Datang Corporation Science and Technology Research Institute Co., Ltd., Hefei Anhui 230088, China;
4. School of Materials Science and Engineering, Hefei University of Technology, Hefei Anhui 230009, China

Received:2019-10-05 Online:2020-04-25 Published:2020-05-08

Abstract

Abstract: In order to obtain a water wall protective coating with high service life under the operating conditions of thermal power plant boilers, a new developed coating was designed and manufactured on the basis of referring to the composition of existing coating. The developed FeCrNiBSi coatings and FeCrNi coating were prepared on Q235 steel by supersonic arc spraying. The high temperature corrosion resistance test of the two coatings were carried out respectively. The surface morphology and corrosion mechanism of the coatings before and after corrosion in molten salt environment were studied by means of metallographic microscope, scanning electron microscope and X-ray diffraction. The results show that the developed FeCrNiBSi coatings have better high temperature corrosion resistance and higher surface hardness than the FeCrNi coatings, and are more suitable for the protection coatings of boiler water wall in thermal power plants.

Key words: boiler water wall, high temperature corrosion, porosity, supersonic arc spraying

CLC Number:

TG174.4

Meng Dianwu, Zhang Jiantang, Shen Nan, Hu Xuefei, Lu Yu, Du Xiaodong. New supersonic arc spraying coating for boiler water wall protection[J]. Heat Treatment of Metals, 2020, 45(4): 183-187.

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New supersonic arc spraying coating for boiler water wall protection

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