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激光熔覆FeCrNiCoMoCuBSi高熵合金涂层的腐蚀磨损性能
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中国石油大学(华东)材料科学与工程学院

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山东省自然科学基金资助(项目号ZR2019MEM032)


Tribocorrosion behaviors of laser cladding FeCrNiCoMoCuBSi high entropy alloy coating
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1.School of Materials Science and engineering;2.School of Materials Science and Engineering

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    摘要:

    利用激光熔覆技术在316L不锈钢表面制备了FeCrNiCoMoCuBSi高熵合金涂层,分析了其组织结构、硬度、摩擦磨损、电化学腐蚀和腐蚀磨损性能。结果表明,熔覆层成型良好,表面无裂纹、气孔等缺陷。熔覆层主要由FCC固溶体相组成,微观组织以“柳条状”树枝晶为主,结合区为平面晶,与基体呈良好的冶金结合。熔覆层的平均硬度为700 HV0.2,约为基材的3.5倍。熔覆层在不同载荷下的摩擦系数均低于基材,磨损量小于基材,表现出明显优于基材的耐磨性。在3.5wt% NaCl溶液中,熔覆层自腐蚀电流密度为4.74×10-8A.cm-2,低于基材两个数量级,耐蚀性优异。在摩擦载荷与腐蚀耦合作用下,熔覆层开路电位发生负偏移,腐蚀倾向增大。随摩擦载荷增大,自腐蚀电位负移,自腐蚀电流密度增大,摩擦促进腐蚀作用增大。

    Abstract:

    The FeCrNiCoMoCuBSi high-entropy alloy coating was prepared on the surface of 316L stainless by laser cladding technology. The microstructure, hardness, wear, electrochemical and tribocorrosion properties of the coating were studied. The results show that the cladded coating is well formed with no defects such as cracks and pores on the surface. The cladded coating is mainly composed of FCC solid solution phase, the microstructure is dominated by “wicker-like” dendrites, and the bonding area is planar crystals, which have a good metallurgical bond with the 316L stainless. The average hardness of the coating is 700 HV0.2, which is about 3.5 times that of the substrate. The cladded coating shows significantly better wear resistance than the substrate under different loads with the lower friction coefficient and the less wear amount. In 3.5wt% NaCl solution, the self-corrosion current density of the coating is 4.74 × 10-8A.cm-2, which is two orders of magnitude lower than that of the substrate, showing excellent corrosion resistance. Under the coupling effect of friction load and corrosion, the open circuit potential of the coating shifted negatively and the corrosion tendency increased. With the increase of friction load, the free-corrosion potential moves negatively, the free-corrosion current density increases, and the effect of friction promoting corrosion increases.

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曹琛婕,王彦芳,张存修,牛德文,司玉冬,斯佳佳,石志强,何艳玲.激光熔覆FeCrNiCoMoCuBSi高熵合金涂层的腐蚀磨损性能[J].稀有金属材料与工程,2023,52(4):1439~1446.[Cao Chenjie, Wang Yanfang, Zhang Cunxiu, Niu Dewen, Si Yudong, Si Jiajia, Shi Zhiqiang, He Yanling. Tribocorrosion behaviors of laser cladding FeCrNiCoMoCuBSi high entropy alloy coating[J]. Rare Metal Materials and Engineering,2023,52(4):1439~1446.]
DOI:10.12442/j. issn.1002-185X.20220227

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  • 收稿日期:2022-03-21
  • 最后修改日期:2022-04-25
  • 录用日期:2022-05-19
  • 在线发布日期: 2023-05-01
  • 出版日期: 2023-04-25