ISSN   1004-0595

CN  62-1224/O4

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于博, 吴有智, 蒋成燕, 王鹏, 赵晓宇, 张贝贝, 严云峰, 袁航空, 柴利强. DLC薄膜在硼酸介质中的腐蚀和摩擦行为研究[J]. 摩擦学学报(中英文), 2024, 44(11): 1−13. doi: 10.16078/j.tribology.2023198
引用本文: 于博, 吴有智, 蒋成燕, 王鹏, 赵晓宇, 张贝贝, 严云峰, 袁航空, 柴利强. DLC薄膜在硼酸介质中的腐蚀和摩擦行为研究[J]. 摩擦学学报(中英文), 2024, 44(11): 1−13. doi: 10.16078/j.tribology.2023198
YU Bo, WU Youzhi, JIANG Chengyan, WANG Peng, ZHAO Xiaoyu, ZHANG Beibei, YAN Yunfeng, YUAN Hangkong, CHAI Liqiang. DLC Films in Boric Acid Media for Corrosion and Friction Behavior Studies[J]. Tribology, 2024, 44(11): 1−13. doi: 10.16078/j.tribology.2023198
Citation: YU Bo, WU Youzhi, JIANG Chengyan, WANG Peng, ZHAO Xiaoyu, ZHANG Beibei, YAN Yunfeng, YUAN Hangkong, CHAI Liqiang. DLC Films in Boric Acid Media for Corrosion and Friction Behavior Studies[J]. Tribology, 2024, 44(11): 1−13. doi: 10.16078/j.tribology.2023198

DLC薄膜在硼酸介质中的腐蚀和摩擦行为研究

DLC Films in Boric Acid Media for Corrosion and Friction Behavior Studies

  • 摘要: 采用磁控溅射(MS)沉积技术在0Cr17Ni4Cu4Nb不锈钢(简称17-4 SS)基底上制备了DLC薄膜,利用电化学工作站对类金刚石薄膜(简称DLC薄膜)在不同浓度的硼酸介质下进行极化曲线测试,评判薄膜在硼酸溶液中的耐腐蚀性能. 利用球盘式摩擦磨损试验机对DLC薄膜在不同浓度硼酸溶液中进行摩擦磨损试验,通过拉曼光谱、X射线衍射仪和能谱仪等测试方法分析了摩擦后磨斑处的摩擦化学产物,探讨了薄膜在硼酸水溶液中的摩擦磨损机理. 电化学试验结果表明,DLC薄膜在硼酸溶液中的腐蚀电流密度与基底相比小1个数量级,薄膜的腐蚀电流密度随着硼酸浓度升高而升高,DLC薄膜的存在改善了17-4SS基底的耐腐蚀性能. 摩擦试验结果表明,DLC/Al2O3陶瓷球和DLC/GCr15钢球摩擦副在硼酸介质中的磨损机制均为磨粒磨损和黏着磨损. 对于DLC/Al2O3陶瓷球摩擦副,随硼酸浓度升高,薄膜体系摩擦系数和磨损率升高. 该摩擦副之间的润滑方式为流体润滑,一方面由于在Al2O3陶瓷球的磨斑处未形成稳定的转移膜,导致体系润滑效果较差;另一方面随着硼酸浓度升高,磨痕的拉曼信号显示D和G峰强度比ID/IG值降低,这是因为sp2杂化碳大量溶解于溶液中,引起磨痕表层处sp2杂化键含量降低,导致摩擦副之间磨粒磨损加剧,导致较高的摩擦系数和磨损率. 而对于DLC/GCr15钢球摩擦副,随硼酸浓度升高,摩擦体系的摩擦系数和磨损率降低. 尤其是与去离子水中的摩擦相比,薄膜在5 000 mg/L的硼酸溶液中摩擦系数降低20%,磨损率降低51%. 该摩擦副之间的润滑方式为边界润滑,摩擦过程中在对偶球接触面形成了含有石墨、Fe2B和B2O3等高粘附且具有润滑性的转移膜,使对偶球与薄膜未能直接接触,大大降低了摩擦副之间的磨粒磨损,提高了摩擦副之间的润滑性能,使摩擦系数和磨损率降低.

     

    Abstract: The DLC films were prepared on 0Cr17Ni4Cu4Nb stainless steel (17-4 stainless steel) substrates by magnetron sputtering (MS) deposition. The corrosion resistance of the DLC films was assessed in boric acid media by testing their polarization curves at varying concentrations by an electrochemical workstation. To explore the mechanism of friction and wear of the thin films in aqueous boric acid solutions, friction and wear tests were executed using a ball-and-disk friction and wear tester in boric acid solutions with different concentrations. The obtained chemical products at the abrasion spots after friction were characterized by Raman, XRD and EDS analyses. The results of electrochemical experiments revealed that the corrosion current density of substrate was one order of magnitude higher compared to that of the DLC films in the boric acid solution. Additionally, the corrosion current density of the films increased as the boric acid concentration increased. Furthermore, the presence of DLC films enhanced the corrosion resistance of the substrate. The results of friction experiments showed that the wear mechanisms of both the DLC/Al2O3 ceramic ball and the DLC/GCr15 steel ball friction substitutes in boric acid medium were abrasive and adhesive wear. For the DLC/Al2O3 ceramic ball friction pairs, the friction coefficient and wear rate of the film system increased gradually with the increase of boric acid concentration. The lubrication mode between the DLC/Al2O3 friction pairs was fluid lubrication. On the one hand, the lubrication effect of the system was lower due to the lack of a stable transfer film at the wear spots of the Al2O3 ceramic balls. On the other hand, with the increase of the boric acid concentration, the Raman signals of the wear tracks showed a decrease in the value of ID/IG, which was due to the fact that a large amount of sp2 hybridised carbon was dissolved in the solution causing a decrease in the content of the sp2 hybrid bonds at the surface of the wear tracks and then an increase in abrasive wear between the friction pairs. The increase of abrasive wear between friction pairs caused higher friction coefficient and wear rate. For the DLC/GCr15 steel ball friction pairs, the friction coefficient and wear rate of the friction system decreased with the increase of boric acid concentration. In particular, the film showed 20% lower friction coefficient and 51% lower wear rate in 5000 mg/L boric acid solution compared to the friction in deionized water. The lubrication mode between this friction pairs was boundary lubrication, and the transfer film containing graphite, Fe2B and B2O3 with high adhesion and lubricity was formed on the contact surface of the balls during the friction process. Thus, the balls and the film failed to come into direct contact with each other, which greatly reduced the abrasive wear and improved the lubrication performance between the friction pair leading to decreased friction coefficient and wear rate.

     

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