低碳钢液相等离子体电解B+...+N共渗层的摩擦电化学行为_王彬.pdf

表面技术 第 52 卷 第 6 期 80 SURFACE TECHNOLOGY 2023 年 6 月 收稿日期：20220504；修订日期：20221026 Received：2022-05-04；Revised：2022-10-26 基金项目：山西省高等学校科技创新项目（2019L0389）；国家自然科学基金（51671032，51071031）Fund：Technology and Innovation Fund of Shanxi Institution of Higher Education(2019L0389);National Natural Science Foundation of China(51671032,51071031)作者简介：王彬（1987），男，博士，副教授，主要研究方向为表面工程。Biography：WANG Bin(1987-),Male,Doctor,Associate professor,Research focus:surface engineering.通讯作者：薛文斌（1968），男，博士，教授，主要研究方向为金属材料表面改性。Corresponding author：XUE Wen-bin(1968-),Male,Doctor,Professor,Research focus:surface modification of light metal materials.引文格式：王彬,周茜,高川力,等.低碳钢液相等离子体电解 B+C+N 共渗层的摩擦电化学行为J.表面技术,2023,52(6):80-87.WANG Bin,ZHOU Qian,GAO Chuan-li,et al.Tribo-Electrochemical Characteristics of PEB/C/N Layer on Low-Carbon SteelJ.Surface Technology,2023,52(6):80-87.低碳钢液相等离子体电解 B+C+N 共渗层的摩擦电化学行为 王彬1，周茜2,3，高川力2,3，李惠2,3，金小越3，薛文斌2,3（1.山西农业大学 基础部，山西 太谷 030801；2.北京师范大学 核科学与技术学院射线束技术教育部重点实验室，北京 100875；3.北京市科学技术研究院 辐射技术研究所，北京 100875）摘要：目的目的 研究液相等离子电解硼碳氮三元共渗处理（PEB/C/N）对 Q235 低碳钢摩擦电化学行为的影响。方法方法 采用 PEB/C/N 方法在 Q235 低碳钢表面制备共渗层，通过电化学的开路电位测试和摩擦磨损实验评估Q235 钢基体和 PEB/C/N 试样在 NaCl（质量分数 3.5%）腐蚀介质中与 Si3N4球对磨的摩擦电化学行为。结果结果 在电压为 280 V 的 PEB/C/N 共渗中，试样周围等离子体区的电子温度稳定在 3 500 K 左右。经过PEB/C/N 处理 30 min 后，生成的共渗层包括 15 m 主要由 Fe2B 相组成的表面渗层和 40 m 的过渡层。在摩擦过程中，PEB/C/N 试样的开路电位保持在200300 mV 之间，且波动较小，明显高于 Q235 钢基体。同时，PEB/C/N 试样的磨损率为 3.88104 m3/(Nm)，只是钢基体磨损率的 1/3。在 NaCl 腐蚀介质中，由于腐蚀和磨损的交互作用，使 Q235 钢基体产生了塑性应变位错和局部的微裂纹，因此磨损进一步增加，磨损机制主要为疲劳磨损和磨粒磨损。PEB/C/N 试样的共渗层有效阻挡了 Cl对基体的腐蚀，磨损机制主要为磨粒磨损。结论结论 PEB/C/N 试样在 NaCl 腐蚀介质中的耐腐蚀和耐磨性能得到明显提升。关键词：低碳钢；等离子体电解；硼碳氮共渗；开路电位；耐腐蚀性；耐磨性 中图分类号：TG156.8 文献标识码：A 文章编号：1001-3660(2023)06-0080-08 DOI：10.16490/ki.issn.1001-3660.2023.06.008 Tribo-Electrochemical Characteristics of PEB/C/N Layer on Low-Carbon Steel WANG Bin1,ZHOU Qian2,3,GAO Chuan-li2,3,LI Hui2,3,JIN Xiao-yue3,XUE Wen-bin2,3(1.Department of Basic Science,Shanxi Agricultural University,Shanxi Taigu 030801,China;2.Key Laboratory of Beam Technology and Materials Modification of Ministry of Education,College of Nuclear Science and Technology,Beijing Normal University,Beijing 100875,China;3.Institute of Radiation Technology,Beijing Academy of Science and Technology,Beijing 100875,China)ABSTRACT:Plasma electrolytic boriding(PEB)technology is an effective way to form iron borides on the steel surface.第 52 卷 第 6 期 王彬，等：低碳钢液相等离子体电解 B+C+N 共渗层的摩擦电化学行为 81 Compared with the single boriding process,the multi-element boriding process can further effectively reduce the hardness gradient by forming a transition layer containing C and N elements between the boride layer and the steel substrate,which plays a significant role in improving the performance of the diffusion layer.At present,the evaluation of the corrosion resistance of the boride layer on metal surface is mostly carried out under static corrosion conditions.However,the metal workpiece is more vulnerable due to corrosion and friction interaction in corrosive medium and long-term mechanical operation environment,so studying the tribo-electrochemical behavior of metal in corrosive medium environment is critical.In this work,the plasma electrolytic borocarbonitriding process(PEB/C/N)was carried out in an aqueous solution containing 25wt.%borax,10wt.%glycerin and 3wt.%carbamide.The anode and cathode were set to be the stainless steel bath and the Q235 low-carbon steel sample,respectively.The constant negative bias voltage was increased to 280 V,and the whole processing time was 30 min.The morphology,composition distribution and phase composition of the borocarbonitriding layer were studied.The tribo-electrochemical behavior of Q235 steel substrate and PEB/C/N sample against Si3N4 ball in 3.5wt.%NaCl solution was evaluated by electrochemical open-circuit potential(OCP)tests and tribological tests.The results showed that the electron temperature in the plasma zone around the sample was stable at 3 500 K in the PEB/C/N process at 280 V.After the PEB/C/N treatment for 30 min,the borocarbonitriding layer contained a 15 m surface layer which was mainly composed of Fe2B phase and a 40 m transition layer.In friction,the open-circuit potential of PEB/C/N sample remained between 200 mV and 300 mV with a small fluctuation,which was obviously higher than the Q235 steel substrate.The corrosion resistance of the PEB/C/N sample was significantly improved.Meanwhile,the wear rate of the PEB/C/N sample was 3.88104 m3/(Nm),which was only 1/3 of the Q235 steel substrate,and the wear resistance of the PEB/C/N sample was obviously improved.In the NaCl solution,dislocation increment and migration in plastic deformation occurred on bare Q235 steel due to the interaction of corrosion and wear.There were intensive parallel furrows and obvious fatigue spalling on the wear surface of the Q235 steel substrate,so the wear mechanism of Q235 steel substrate was mainly fatigue and abrasive wear.However,the borocarbonitriding layer of the PEB/C/N sample effectively prevented the corrosion of Cl on the Q2