添加碳化钨和石墨改善真空熔覆Ni-Co基合金涂层的极化行为

doi:10.11896/j.issn.1005-023X.2018.06.013

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Abstract The Ni-Co alloy fusion coating, Ni-Co+WC and Ni-Co+WC+Graphite composite fusion coating were fabricated through the vacuum fusion sintering technique on 45# steel substrate, and the resultant coatings’ electrochemical behavior in 3.5% NaCl solution was studied. Our experiment confirmed the higher (at least 4.98% higher) self-corrosion potentials and lower (74.93% lower) corrosion current densities of Ni-Co alloy fusion coatings compared with ZG45 substrate, as well as the monotonic increase of self-corrosion potential with the increasing Co content for the Ni-Co alloy fusion coatings. The addition of WC and graphite (G) causes the rise of self-corrosion potential for Ni-Co alloy fusion coatings. Ni-Co+WC+Graphite composite fusion coating holds the self-corrosion potential superiority of 32.39% and 33.86% to Ni-Co+WC coating and Ni-40%Co coating, respectively, also a corrosion current density 19.37% lower than Ni-Co+WC coating, thereby demonstrating the significantly improved corrosion resistance. Moreover, on the polarization curve of Ni-Co+WC+Graphite sample, the passivation region can be observed, the width of which is larger than that of the Ni-Co+WC composite fusion coating. This indicates that the corrosion resistance of Ni-Co+WC+Graphite coa-ting is more satisfactory.

Key words： tungsten carbide graphite Ni-Co-based alloy composite coating vacuum fusion sintering polarization curve

Published: 25 March 2018

CLC number:

TG174.4

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	Articles by authors
	YANG Guirong
	SONG Wenming
	WANG Jianru
	ZHANG Yufu
	WANG Fuqiang
	MA Ying

Cite this article:

YANG Guirong,SONG Wenming,WANG Jianru, et al. The Addition of WC and Graphite Improves Polarization Behavior of Ni-Co-based Alloy Coatings Fabricated by Vacuum Fusion Sintering[J]. Materials Reports, 2018, 32(6): 924-929.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.06.013 OR http://www.mater-rep.com/EN/Y2018/V32/I6/924

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