激光熔覆FeCrBSi中熵合金涂层的腐蚀磨损行为

王彦芳, 张云鹏, 曹琛婕, 刘燕乐, 王蕴轩, 石志强

doi:10.16577/j.issn.1001-1560.2025.0079

材料保护 >

2025 , Vol. 58 >Issue 5: 82 - 90

DOI: https://doi.org/10.16577/j.issn.1001-1560.2025.0079

激光表面改性技术专栏

激光熔覆FeCrBSi中熵合金涂层的腐蚀磨损行为

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中国石油大学(华东)材料科学与工程学院山东省智能能源材料重点实验室

王彦芳(1976－)，博士，副教授，主要从事新材料与材料表面改性研究，E-mail: wang＠upc.edu.cn

收稿日期: 2024-12-27

修回日期: 2025-02-08

录用日期: 2025-02-10

网络出版日期: 2025-06-10

基金资助

山东省自然科学基金(ZR2019MEM032)

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Tribocorrosion Behavior of Laser-Cladded FeCrBSi Medium-Entropy Alloy Coatings

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(Shandong Key Laboratory of Intelligent Energy Materials， School of Materials Science and Engineering，China University of Petroleum (East China)， Qingdao 266580， China)

WANG Yanfang(1976－)， Ph.D.， Associate Professor， Research Focus: Advanced Materials and Material Surface Modification， E-mail: wang＠upc.edu.cn

Received date: 2024-12-27

Revised date: 2025-02-08

Accepted date: 2025-02-10

Online published: 2025-06-10

Supported by

Nature Science Foundation of Shandong Province (ZR2019MEM032)

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摘要

海洋油气工程装备由于海水腐蚀和机械磨损，损失严重。兼具耐磨耐蚀性能的中熵合金是理想的表面防护涂层材料。在316L 不锈钢基材表面激光熔覆FeCrBSi 中熵合金涂层，利用X 射线衍射(XRD)、金相显微镜和电化学腐蚀摩擦磨损试验仪分析熔覆层的组织结构和腐蚀磨损耦合损伤行为。结果表明，熔覆层由FCC＋BCC 双固溶体相组成，熔覆区主要为树枝晶，结合区为平面晶。 FeCrBSi 中熵合金熔覆层的平均硬度为939 HV0.2，约是316L 不锈钢基材的4.4 倍；随摩擦载荷增大，FeCrBSi 中熵合金熔覆层的摩擦系数减小，平均摩擦系数在0.2～0.5之间，最大磨损量为0.052 mm3，较基材耐磨性明显提升；在3.5%(质量分数) NaCl 溶液中，熔覆层的自腐蚀电位为－0.05 V，自腐蚀电流密度为1.45×10－7 A/cm2，耐蚀性优于316L 不锈钢。在摩擦载荷与外加电位腐蚀耦合作用下，随外加电位的升高，平均电流密度和磨损量增大，摩擦系数减小。腐蚀与磨损相互促进，但腐蚀促进磨损损失量占总损失量的92.5%以上，占主导地位。

关键词： 激光熔覆; 中熵合金涂层; 显微组织; 腐蚀磨损

本文引用格式

王彦芳, 张云鹏, 曹琛婕, 刘燕乐, 王蕴轩, 石志强 . 激光熔覆FeCrBSi中熵合金涂层的腐蚀磨损行为[J]. 材料保护, 2025 , 58(5) : 82 -90 . DOI: 10.16577/j.issn.1001-1560.2025.0079

Abstract

Marine oil and gas engineering equipment suffers significant damage due to seawater corrosion and mechanical wear.Medium-entropy alloys， with their combined wear and corrosion resistance， are considered ideal materials for surface protective coatings.In this study， a FeCrBSi medium-entropy alloy coating was prepared on the surface of 316L stainless steel via laser cladding technology.The microstructure and tribocorrosion coupling behavior of the cladded layer were analyzed using X-ray diffraction (XRD)， metallographic microscopy and electrochemical corrosion and tribological tester.Results showed that the cladding layer consisted of dual-phase FCC and BCC solid solutions.The cladded zone was primarily composed of dendritic structures， while the bonding zone exhibited planar crystals.The average hardness of the FeCrBSi medium-entropy alloy coating reached 939 HV0.2， approximately 4.4 times that of the 316L stainless steel substrate.As the applied frictional load increased， the coefficient of friction of the coating decreased， with average values ranging from 0.2 to 0.5.The maximum wear volume was 0.052 mm3， indicating a significant improvement in wear resistance compared to the substrate.Electrochemical testing in a 3.5%(mass fraction) NaCl solution demonstrated superior corrosion resistance compared to 316L stainless steel， as indicated by a self-corrosion potential of -0.05 V and a corrosion current density of 1.45×10－7 A/cm2.Under the combined effect of frictional load and externally applied corrosion potential， both the average current density and wear volume increased with increasing potential， while the friction coefficient decreased.A synergistic interaction between corrosion and wear was observed.Notably， corrosion-induced wear contributed over 92.5%to the total material loss， demonstrating its dominant role.

Key words： laser cladding; medium-entropy alloy coating; microstructure; tribocorrosion

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