Authors: Đỗ Quang Chiến, Lê Thu Quý, Nguyễn Văn Tuấn, Vũ Đình Hải – Key Laboratory of Welding Technology and Surface Treatment, National Research Institute of Mechanical Engineering; Institute of Tropical Engineering, Vietnam Academy of Science and Technology;
Power Generation Corporation 1

Published in: Proceedings of the National Scientific Conference on Hydraulic Machinery and Automation Systems 2021

Publication date: 2021

Abstract: This paper summarizes the research results on fabrication of Cr3C2-NiCr ceramic coatings by plasma spraying method, applied to restore and enhance the service life of circulating pump components operating in seawater. The investigated coating properties include porosity, microhardness, sliding adhesion on steel substrate, phase composition, and wear-corrosion resistance. Three technological parameters for coating fabrication were investigated: plasma current, spraying distance, and powder feed rate. Based on laboratory analysis results, the ceramic coating with appropriate spraying parameters was applied to protect against wear for components of two seawater circulating pump systems at Nghi Son 1 Thermal Power Plant, yielding good results after more than one year of operation.

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