ISSN   1004-0595

CN  62-1224/O4

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浸渍石墨在陶瓷摩擦副下的摩擦腐蚀行为研究

Corrosion and Wear Behavior of Impregnated Graphite under Ceramic Pairing

  • 摘要: 研究不同介质环境中浸渍石墨的摩擦腐蚀特性,采用扫描电子显微镜和激光共聚焦显微镜分别表征了表面磨痕形貌、磨痕轮廓和磨损体积,通过分析在纯水与海水中的开路电位、极化曲线与电化学阻抗图及其相关参数,对浸渍石墨与2种陶瓷对偶球的摩擦磨损情况与机理进行评估分析. 结果表明:浸渍石墨与陶瓷球Si3N4相对摩擦时自腐蚀电流密度更低,容抗弧度与相位角较大,极化电阻值更高,具有更好的耐腐蚀性能和耐磨性. 随着载荷的增大,开路电位负移耐腐蚀性增强. 纯水中石墨磨损表面存在明显的犁沟现象,以摩擦磨损为主. 海水中腐蚀产物与磨屑混合在接触表面形成转移膜,表现较为光滑. 摩擦过程中磨损体积、摩擦耗散能与载荷呈正相关性,而磨损率与载荷呈负相关性. 海水中黏着现象较为明显,伴有磨粒磨损和轻微的氧化磨损. 纯水中接触区以磨粒磨损为主,伴有轻微的黏着磨损和疲劳磨损.

     

    Abstract: The friction and corrosion characteristics of impregnated graphite in different media environments were studied by using scanning electron microscope and laser confocal microscope to respectively characterize the surface wear morphology, contact zone wear contour and wear volume. Analyzed the open circuit potential, polarization curve, electrochemical impedance map, and some key parameters related electrochemical impedance in deionized water and seawater, the friction and wear surface properties and mechanism of graphite impregnated paired with two kinds of ceramic dual balls were evaluated and analyzed. The results showed that the self-corrosion current density was lower, the capacitance arc was larger and phase angle was higher, the polarization resistance values were larger, when impregnated graphite was matched with ceramic ball Si3N4, and the impregnated graphite matched with ceramic ball Si3N4 exhibit a characteristic of better corrosion resistance and wear resistance. With the normal load increased, the open circuit potential showed a tendency to move in a negative direction, indicating that the corrosion resistance of graphite contact zone was enhanced. There was obvious furrow phenomenon on the surface of graphite in deionized water, and the wear mechanism was manifested as friction wear. The corrosion products and abrasive debris in the process of graphite wear and corrosion under seawater media formed a transfer film on the contact surface, and the contact surface morphology showed relatively smooth. During friction and corrosion process, the wear volume and dissipated energy in the friction process showed positively correlated with the increase of the normal load, while the wear rate showed negatively correlated with the increase of the normal load. The phenomenon of adhesion showed more obvious in seawater on the graphite contact surface, accompanied by abrasive wear and slight oxidation wear. The contact area in deionized water performed mainly abrasive wear, accompanied by slight adhesive wear and fatigue wear.

     

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