| 摘要: |
| 氧化石墨烯(GO)作为一种典型的二维层状材料在表面防护领域具有较大的应用潜力，然而其团聚现象和表面大量纳米孔隙的存在往往会削弱其对基体的保护作用。将硬脂酸(SA)接枝到 GO 片层并采用自组装的方法，在 AZ31B 镁合金表面制备 SA-GO 复合涂层。采用 SEM、XRD 和 FT-IR 表征涂层的表面形貌、结构以及官能团；采用接触角测试仪、电化学工作站和摩擦磨损试验机分别表征涂层的润湿性、耐蚀性以及耐磨性。电化学测试结果表明，该复合涂层的引入使得腐蚀电流密度降低了约三个数量级，显著提高了镁合金基体的耐蚀性，这与涂层孔隙率的降低以及疏水性的增加有关。摩擦测试结果表明：与镁合金基体相比，SA-GO 涂层的磨损率降低了 99.3%，摩擦因数降低了 83.1%，这与 SA 的自润滑性能以及 GO 层间距增加导致 GO 片层更易滑移有关。研究成果为实现金属表面防腐/耐磨一体化防护研究提供了实验依据和理论基础。 |
| 关键词: 镁合金 氧化石墨烯 硬脂酸 防腐性 耐磨性 |
| DOI：10.11933/j.issn.1007-9289.20210624002 |
| 分类号:TB304 |
| 基金项目:江苏省高等学校自然科学研究重大项目资助项目(19KJA150002) |
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| Stearic Acid / graphene Oxide Composite Coatings on Mg Alloy Surfaces for Anti-corrosion / wear Performances |
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WANG Ying1,2, TANG Aiguo1, ZHOU Xingyi1, PANG Xianjuan3, YUAN Ningyi1, DING Jianning1,2
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1.Jiangsu Province Cultivation Base for State Key Laboratory of Photovoltaic Science and Technology,Changzhou University, Changzhou 213164 , China;2.Micro / nano Science and Technology Center, Jiangsu University, Zhenjiang 212013 , China;3.National United Engineering Laboratory for Advanced Bearing Tribology,Henan University of Science and Technology, Luoyang 471023 , China
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| Abstract: |
| Two-dimensional graphene oxide (GO) nanosheets have great application potential in the field of surface protection. However, the agglomeration of graphene oxide and the nanopores on its surface often weaken its protective performance. Based on this, stearic acid (SA) is grafted onto the GO sheet and the SA-GO composite coating is prepared on the surface of AZ31B Mg alloy by a self-assembly method. SEM, XRD and FT-IR are used to characterize the surface morphology, structure and functional groups of the coating, respectively. Water contact angle measuring instrument, electrochemical workstation and friction and wear testing machine are used to characterize the wettability, corrosion and wear resistance of the coating, respectively. Electrochemical measurements indicate that the introduction of SA-GO coating reduces the corrosion current density by about three orders of magnitude and significantly improves the corrosion resistance of the Mg alloy, which is related to the reduction of the intrinsic capillaries and the increasing of hydrophobicity. Additionally, compared with that of the Mg alloy substrate, the wear rate of the SA-GO coating is reduced by 99.3%, and the friction coefficient is reduced by 83.1%. It is related to the easier slippage of the GO sheets caused by the increased interlaminar spacing and the self-lubricating properties of SA. This paper provides an experimental and theoretical basis for the research on the integrated anti-corrosion/wear protection of metal surface. |
| Key words: Mg alloy graphene oxide stearic acid anti-corrosion performance wear resistance |
