Nb<sub>2</sub>N涂层制备及其耐腐蚀性能研究

doi:10.11902/1005.4537.2018.116

中国腐蚀与防护学报

2019, Vol. 39

Issue (4): 313-318 DOI: 10.11902/1005.4537.2018.116

研究报告

本期目录 | 过刊浏览

Nb₂N涂层制备及其耐腐蚀性能研究

史昆玉(

),张进中,张毅,万毅

武汉工程大学机电工程学院武汉 430205

Preparation and Corrosion Resistance of Nb₂N Coating on TC4 Ti-alloy

SHI Kunyu(

),ZHANG Jinzhong,ZHANG Yi,WAN Yi

Department of Mechanical and Electrical Engineering, Wuhan Institute of Technology, Wuhan 430205, China

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摘要:

采用双阴极等离子溅射沉积技术在TC4 (Ti-6Al-4V) 合金基体表面制备了Nb₂N涂层，利用XRD，SEM和EDS研究涂层的微观组织结构；使用划痕法测试了涂层与基体的结合力；采用开路电位 (OCP) 测量、动电位极化、电化学阻抗谱 (EIS) 等电化学测试技术，研究所制备的Nb₂N薄膜在3.5% (质量分数) NaCl溶液中的电化学腐蚀行为，并与TC4基体进行比较。结果表明：所制备涂层分为过渡层和沉积层，涂层厚度约为21 μm。涂层连续致密且光滑，没有明显孔洞或间隙。Nb₂N涂层相较于TC4基体开路电位到达稳态值时间较短且稳态值较高；Nb₂N涂层点腐蚀电位更高，腐蚀电流更低；涂层阻抗谱数据呈现单一容抗弧特性，容抗弧值高于TC4基体的，且相位角曲线最大值更大并且最大值处具有更宽的区间。

关键词 ：双阴极等离子溅射技术, Nb₂N涂层, 微观结构, 耐腐蚀性能, TC4(Ti-6Al-4V), 合金

Abstract：

Nb₂N coating was deposited onto TC4 (Ti-6Al-4V) substrates via a double cathode glow discharge plasma method. The microstructure of the coating was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectrometer (EDS). The adhesive property of Nb₂N coating to the substrate was assessed by scratch test. While the electrochemical behavior in 3.5% (mass fraction) NaCl solution of the coating was investigated with electrochemical techniques, such as open circuit potential (OCP) measurement, potentiodynamic polarization and EIS. Result shows that the as-deposited coating of 21 μm in thickness is dense with a homogeneous microstructure without obvious voids or micro-crack. Compared with TC4 matrix, the open-circuit potential of Nb₂N coating can reach a higher steady-state value within a shorter time interval, in other words, the coating presents higher corrosion potential (E_corr) and lower corrosion current. The data of EIS show that the Nb₂N coating shows a single capacitive reactance arc with higher capacitive reactance, larger phase angle maximum, as well as wider phase angle plateau, in the contrary to those of the bare TC4 Ti-alloy.

Key words： double cathode glow discharge plasma method Nb₂N coating microstructure corrosion resistance TC4(Ti-6Al-4V) alloy

收稿日期: 2018-08-22

ZTFLH:

TG174.445

基金资助:武汉工程大学科学研究基金(k201519)

通讯作者: 史昆玉 E-mail: shikunyuwh@126.com

Corresponding author: Kunyu SHI E-mail: shikunyuwh@126.com

作者简介: 史昆玉，女，1972年生，博士，副教授

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引用本文:

史昆玉,张进中,张毅,万毅. Nb₂N涂层制备及其耐腐蚀性能研究[J]. 中国腐蚀与防护学报, 2019, 39(4): 313-318.
Kunyu SHI, Jinzhong ZHANG, Yi ZHANG, Yi WAN. Preparation and Corrosion Resistance of Nb₂N Coating on TC4 Ti-alloy. Journal of Chinese Society for Corrosion and protection, 2019, 39(4): 313-318.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2018.116 或 https://www.jcscp.org/CN/Y2019/V39/I4/313

图1 Nb2N涂层的XRD谱

图2 Nb2N涂层的横截面SEM像及对应A和B点处EDS分析结果

图3 Nb2N涂层划痕法测试过程的声发射信号

图4 Nb2N涂层和TC4基体在3.5%NaCl溶液中的开路电位

图5 Nb2N涂层和TC4基体在3.5%NaCl溶液中的极化曲线

表1 极化曲线测试结果

图6 Nb2N涂层和TC4基体在3.5%NaCl溶液中的Nyquist和Bode图

图7 Nb2N涂层和钛合金基体在3.5%NaCl溶液中的等效电路图

表2 阻抗谱等效电路中各参比元件拟合值

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