The Addition of WC and Graphite Improves Polarization Behavior of Ni-Co-based Alloy Coatings Fabricated by Vacuum Fusion Sintering
YANG Guirong1, SONG Wenming1, 2, WANG Jianru1, ZHANG Yufu1, 2, WANG Fuqiang1, MA Ying1
1 State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050; 2 Lanpec Technologies Limited, Lanzhou 730070
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.
杨贵荣, 宋文明, 王建儒, 张玉福, 王富强, 马颖. 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[J]. 材料导报, 2018, 32(6): 924-929.
YANG Guirong, SONG Wenming, WANG Jianru, ZHANG Yufu, WANG Fuqiang, MA Ying. The Addition of WC and Graphite Improves Polarization Behavior of Ni-Co-based Alloy Coatings Fabricated by Vacuum Fusion Sintering. Materials Reports, 2018, 32(6): 924-929.
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2018, Vol. 32 
