Effects of B content on wear and corrosion resistance of laser-cladded Co-based alloy coatings

IF 1.3 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science-Poland Pub Date : 2024-04-02 DOI:10.2478/msp-2023-0040

Rong Xia, Kun Zhang, Fengyuan Shu, Xin Zhang, Liying Yan, Cheng Li

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Abstract

To improve the surface properties of Ti alloy, (Co34Fe8Cr29Ni8Si7)100–x B x alloy, coatings were prepared by laser cladding. The coatings—mainly composed of TiCr, Fe0.1Ti0.18V0.72, CoTi, Ti2Ni, and TiB—and amorphous phases were investigated in terms of microstructure, wear resistance, and corrosion resistance. The results showed that the microhardness of the Co-based coatings first increased and then decreased with the increase of B content. When the B content was 6%, the microhardness of the coating increased up to 1210 HV0.2 which was 3.4 times that of TC4 alloy substrate. The coatings exhibited diverse wear mechanisms that gradually transitioned from severe fatigue spalling and oxidative wear to slightly abrasive wear. The corrosion current density of Co-based coatings in 3.5 wt% NaCl solution first increased and then decreased as B contents increased. Coatings with 4% B content, however, exhibited the best corrosion resistance, which was most suitable for improving the corrosion resistance of Ti alloy.

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B 含量对激光包覆 Co 基合金涂层耐磨性和耐腐蚀性的影响

为了改善 Ti 合金 (Co34Fe8Cr29Ni8Si7)100-x B x 合金的表面性能，我们采用激光熔覆法制备了涂层。研究了涂层（主要由 TiCr、Fe0.1Ti0.18V0.72、CoTi、Ti2Ni 和 TiB 以及非晶相组成）的微观结构、耐磨性和耐腐蚀性。结果表明，随着 B 含量的增加，Co 基涂层的显微硬度先增大后减小。当 B 含量为 6% 时，涂层的显微硬度增加到 1210 HV0.2，是 TC4 合金基体的 3.4 倍。涂层表现出多种磨损机制，从严重的疲劳剥落和氧化磨损逐渐过渡到轻微的磨料磨损。随着 B 含量的增加，Co 基涂层在 3.5 wt% NaCl 溶液中的腐蚀电流密度先增大后减小。然而，硼含量为 4% 的涂层表现出最好的耐腐蚀性，最适合用于提高钛合金的耐腐蚀性。

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来源期刊

Materials Science-Poland MATERIALS SCIENCE, MULTIDISCIPLINARY-

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18.20%

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期刊介绍： Material Sciences-Poland is an interdisciplinary journal devoted to experimental research into results on the relationships between structure, processing, properties, technology, and uses of materials. Original research articles and review can be only submitted.