油气管道37Mn5钢表面激光熔覆CoCrW涂层的组织及腐蚀性能

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Abstract The CoCrW coating was prepared on the surface of 37Mn5 steel in oil and gas pipeline by laser cladding method. The microstructure and hardness of the coating were studied, and the corrosion tests of CoCrW coating and 37Mn5 steel were conducted with 3.5%NaCl solution. The results show that γ-Co and some Cr₇C₃ phases were formed in CoCrW coating. A good interface with metallurgical bonding is formed between the coating and the substrate. Oriented dendrites were formed in the coating and layered dendrites were formed in the cladding structure. The mean hardness of CoCrW coating was 476 HV, and the hardness of CoCrW coating was lower in the area close to the interface. The coating has a larger arc resistance and better corrosion resistance than the substrate. The coating can insulate the matrix from the corrosive solution and avoid the corrosion of the matrix. CoCrW coating has higher corrosion potential and resistance than 37Mn5 steel, which is 1.137 V and 20 208 Ω∙cm² respectively, CoCrW coating has stronger corrosion resistance than 37Mn5 steel.

Key words： laser cladding 37 Mn5 steel CoCrW coating microstructure corrosion performance

Received: 10 July 2020 Published: 18 January 2021

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	WANG Rongjian
	LIANG Jinlu
	HUANG Xiaoyu
	SHI Haixin

Cite this article:

WANG Rongjian,LIANG Jinlu,HUANG Xiaoyu, et al. Microstructure and corrosion properties of laser cladding CoCrW coating on 37Mn5 steel surface of oil and gas pipeline[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(6): 475-479.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2020/V25/I6/475

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