Wear and Corrosive Behaviors of Electroless Ni-LaCl3 Composites on Nanoporous ATO Surface of Ti Substrate
Wear and Corrosive Behaviors of Electroless Ni-LaCl3 Composites on Nanoporous ATO Surface of Ti Substrate
复制标题
Ti基体纳米孔ATO表面化学镀Ni-LaCl3复合材料的磨损和腐蚀行为
DOI：
10.1007/s11665-019-04028-9
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发表时间：
2019-05-01
影响因子：
2.3
通讯作者：
Ouyang, Chun
中科院分区：
文献类型：
--
作者：
Zhou, Xiaowei;Ouyang, Chun
在干摩擦条件下，钛及其合金的耐磨性和抗氧化性较差，严重限制了其工业应用。本文报道了一种在钛衬底纳米孔ATO表面化学镀Ni-LaCl3纳米复合膜以改善其表面性能的方法。以阳极氧化二氧化钛(简称ATO)为模板，在钛表面沉积Ni-LaCl3薄膜，获得了良好的结合界面。通过将阳极氧化电压从DC 60调节到240 nV，利用高电压和低电流密度的状态对ATO模板的表面进行了操纵，以获得合适的纳米孔直径。在ATO表面成功地形成了具有叶状表面的Ni-LaCl3薄膜。结果表明，当镀液中LaCl3的加入量从0增加到4.0g时，Ni-LaCl3薄膜中的Ni晶体沿Ni(111)、(200)、(220)和(311)晶面的择优取向发生了变化，而纯Ni样品则没有发现Ni(111)和(200)晶面的择优取向。如预期的那样，Ni-4.0g-L- -1LaCl3薄膜的比磨损率为~−10−5 mm~3·(N·mm)−_3，比未涂覆的钛衬底低2倍。此外，纯Ni的显微硬度为~ 629Hv0.2，远低于Ni-LaCl3薄膜的~ 752Hv0.2，但高于钛衬底的~ 336Hv0.2。此外，Ni-LaCl3复合材料比纯Ni具有更好的耐蚀性，这归因于La3+离子及其富La不溶产物在腐蚀表面的共存，从而填补了孔洞。有鉴于此，在钛基材表面沉积Ni-LaCl3薄膜可以指导钛合金抗磨损腐蚀失效的表面改性，进一步提高钛合金在恶劣条件下的使用寿命。
Ti and its alloys, because of its poor wear and oxidation resistance, have seriously restricted its industrial applications in the dry friction conditions. Herein we reported an easy-handling and effective approach for electroless Ni-LaCl3 nanocomposite films on nanoporous ATO surface of Ti substrate to modify its surface properties. Anodized titanium oxide, shorted as ATO, was designed as a template to deposit Ni-LaCl3 films on Ti surface with superior bonding interface. By adjusting the anodizing voltage from DC 60 to 240 V, the surface of ATO templates was manipulated to achieve a suitable diameter of nanopores using high voltage with low-current density state. The as-received Ni-LaCl3 film with a leaflike surface was successfully formed on to ATO surface. With an increase in LaCl3 addition from 0 to 4.0 g L−1 in bath, results indicated that the diversified orientations of Ni crystals along Ni (111), (200), (220) and (311) were detected for Ni-LaCl3 films, rather than preferred directions of Ni (111) and (200) for pure Ni sample. As expected, the specific wear rate was ~ 10−5 mm3 (N m)−1 for Ni-4.0 g L−1 LaCl3 films, which was two times lower than that of the un-coated Ti substrate. Besides a lower microhardness of ~ 629 HV0.2 was detected for pure Ni, which was much lower that of ~ 752 HV0.2 for Ni-LaCl3 films, but higher than that of ~ 336 HV0.2 for Ti substrate. In addition, a superior corrosion resistance was obtained for Ni-LaCl3 composites relative to pure Ni, which was ascribed to the coexistence of La3+ ions and its La-rich insoluble products on its corroded surfaces for completing the pitting holes. In view of these, the as-deposited Ni-LaCl3 films on the surface of Ti substrate could guide an available proposal for surface modifying of Ti alloys against the wear corrosive failures, further intensifying their servicing life as subjected to harsh conditions.