非晶Ti-B基涂层的力学和耐蚀性能研究

doi:10.11902/1005.4537.2016.176

中国腐蚀与防护学报

2016, Vol. 36

Issue (6): 573-579 DOI: 10.11902/1005.4537.2016.176

研究报告

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非晶Ti-B基涂层的力学和耐蚀性能研究

徐相英^1,²,葛芳芳²,李朋²,舒瑞²,黄峰²(

),李谋成¹

1. 上海大学材料科学与工程学院上海 200072
2. 中国科学院宁波材料技术与工程研究所宁波 315201

Corrosion Resistance and Hardness of Amorphous Ti-B Based Coatings

Xiangying XU^1,²,Fangfang GE²,Peng LI²,Rui SHU²,Feng HUANG²(

),Moucheng LI¹

1. Materials Science and Engineering, Shanghai University, Shanghai 200072, China
2. Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China

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摘要:

采用磁控溅射技术,分别在康宁玻璃、硅片和NdFeB合金基材表面沉积一层非晶的Ti-B基涂层。非晶Ti-B基涂层可以消除磁控溅射常见的柱状晶结构。利用XRD,SEM,纳米压痕仪和电化学工作站对涂层的结构、力学性能和耐蚀行为进行表征。结果表明：通过工艺控制,获得了密度分别为4.04,4.27和4.61 g/cm³的Ti-B基涂层。所获得的Ti-B基涂层呈现均匀、致密的非晶结构,消除了常见的柱状晶结构。非晶Ti-B基涂层的力学和耐蚀性能与其密度紧密相关。当密度提高14.11%时,硅片基底涂层的硬度提高了49.01%,NdFeB基底涂层的腐蚀电流密度降低了66.67%。当密度为4.61 g/cm³时,Si片上涂层的硬度和塑性指数分别是30.1 GPa和0.48;对于NdFeB基底在3.5% (质量分数) NaCl溶液中腐蚀电流密度为1.34×10^-6 A/cm²,约为纯基材腐蚀电流密度的1/8;腐蚀电位为-0.689 V,相对于基材正移0.220 V。说明该非晶涂层对NdFeB基材具有较好的耐蚀保护作用。

关键词 ：非晶涂层, 金属基材, 硬度, 耐蚀性能

Abstract：

Amorphous Ti-B based coatings with various densities were deposited on various substrates, i.e. Eagle glass, silicon slice and NdFeB alloy respectively, by means of magnetron sputtering, and then their structure, hardness and corrosion resistance were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), nanoindentation tester, and Modulab electrochemical workstation. The results show that the prepared coatings are amorphous with densities varying in a range 4.04, 4.27 and 4.61 g/cm³ through controlling the processing parameter. Their cross-sectional morphologies show that all the coatings are homogeneous, compact and smooth without features of columnar structure existed in the common PVD coatings. The hardness and corrosion resistance of coatings are closely related to their densities. When the coating density is increased by 14.11%, the hardness is enhanced by 49.01% for the coatings deposited on silicon slice, and the corrosion current density is decreased to 1/3 of that of the one with density 4.04 g/cm³, for the coatings deposited on NdFeB. Correspondingly, the hardness and plastic index are 30.1 GPa and 0.48 respectively for the coating with density 4.61 g/cm³ on silicon slice. Meanwhile, all the coatings with various densities can provide corrosion protection for NdFeB substrates. With the increasing coating density the free corrosion potential shifts to the positive direction and the relevant free corrosion current density decreases gradually for the Ti-B coatings on NbFeB, in the contrast, the bare substrate is just the opposite. The coating with density 4.61 g/cm³ on NdFeB exhibits a free corrosion current density 1.34×10^-6 A/cm², about 1/8 of that of NdFeB substrate, and free corrosion potential -0.689 V, 0.220 V nobler than bare substrate in the 3.5% (mass fraction) NaCl solution. It follows that the amorphous and hard Ti-B coatings can provide good protectiveness to the NdFeB alloy in environments such as NaCl solution.

Key words： amorphous coating metal substrate hardness corrosion resistance

基金资助:国家重点基础研究发展计划项目 (2014CB643302) 和宁波市自然科学基金项目 (2015A610050) 资助

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引用本文:

徐相英,葛芳芳,李朋,舒瑞,黄峰,李谋成. 非晶Ti-B基涂层的力学和耐蚀性能研究[J]. 中国腐蚀与防护学报, 2016, 36(6): 573-579.
Xiangying XU, Fangfang GE, Peng LI, Rui SHU, Feng HUANG, Moucheng LI. Corrosion Resistance and Hardness of Amorphous Ti-B Based Coatings. Journal of Chinese Society for Corrosion and protection, 2016, 36(6): 573-579.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.176 或 https://www.jcscp.org/CN/Y2016/V36/I6/573

表1 不同涂层的密度和Ti含量

图1 3种不同密度涂层的截面形貌

图2 3种不同Ti-B涂层的XRD谱

图3 Ti-B基涂层的硬度与压入模量

图4 3种不同密度涂层的塑性指数随密度的变化曲线

图5 3种不同密度Ti-B基涂层的极化曲线

表2 涂层和NdFeB基底样品的电化学参数

图6 不同Ti-B非晶涂层的Bode图和Nyquist图

图7 阻抗谱拟合后的等效电路图

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