楚景慧,佟立波,江忠浩.氧化石墨烯/硅烷自组装涂层对镁合金耐腐蚀和耐磨损性能的影响[J].表面技术,2019,48(3):62-68.
CHU Jing-hui,TONG Li-bo,JIANG Zhong-hao.Effect of Graphene Oxide/Silane Self-assemble Coating on Corrosion and Wear Resistance of Mg Alloy[J].Surface Technology,2019,48(3):62-68 |
| 氧化石墨烯/硅烷自组装涂层对镁合金耐腐蚀和耐磨损性能的影响 |
| Effect of Graphene Oxide/Silane Self-assemble Coating on Corrosion and Wear Resistance of Mg Alloy |
| 投稿时间：2018-11-29 修订日期：2019-03-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.03.009 |
| 中文关键词: 镁合金 自组装涂层 GO 硅烷 耐蚀性 耐磨性 |
| 英文关键词:Mg alloy self-assemble coating GO silane corrosion resistance wear resistance |
| 基金项目:国家自然科学基金面上项目（51171178）；吉林省国际合作项目（20180414016GH） |
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| 中文摘要: |
| 目的 同时改善镁合金的耐腐蚀和耐磨损性能。方法 将镁合金表面进行羟基化处理，依次在1,2-双(三乙氧基硅基)乙烷（BTSE）和氧化石墨烯（GO）溶液中浸渍，反复进行，得到一定层数的自组装涂层。通过扫描电子显微镜（SEM）、能谱仪（EDS）表征自组装涂层的形貌和组成。通过电化学测试、摩擦磨损实验，研究涂层对镁合金耐腐蚀、耐磨损性能的影响，并通过扫描电子显微镜、光学显微镜（OM）和表面轮廓仪，对磨痕形貌、深度和宽度进行了分析。结果 自组装涂层表面有氧化石墨烯的层片状结构，最外层的双硅烷分子层将底层完全覆盖，涂层具有较好的致密性和完整性。由极化曲线可得，GO/BTSE涂层将镁基底的腐蚀速率由1.45×10?1 mm/a减小到1.43×10?2 mm/a，降低了一个数量级。电化学阻抗谱的等效电路拟合结果表明，GO/BTSE涂层将裸镁合金的电荷转移电阻由562.2 Ω?cm2增大到1559 Ω?cm2。另外，磨损实验结果表明，镁合金具有较大的摩擦系数，在0.32~0.42范围内波动。涂覆GO/BTSE后，样品的摩擦系数明显降低，在0.20~0.23范围内波动。自组装涂层有效降低了基底合金的磨损率，由3.51×10?3 mm3/(N×m)减小到3.24×10?5 mm3/(N×m)。结论 双硅烷和氧化石墨烯之间通过氢键连接，能够有效提高层片之间的结合力，使涂层致密，并且能够显著改善镁合金的耐蚀和耐磨性。 |
| 英文摘要: |
| The work aims to improve the corrosion and abrasion resistance of Mg alloys. The surface of Mg alloy was hy-droxylated and then immersed into the bis (triethoxysilyl) ethane (BTSE) and graphene oxide (GO) solution for a time repeatedly to obtain the self-assembled coating with certain layers. The scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS) were used to characterize the morphologies and composition of coating. The effects of coating on corrosion and wear resistance of Mg alloy were studied by the electrochemical tests and tribological measurements. The morphologies, depth and width of wear area were deeply analyzed by SEM, optical microscope (OM) and 3D surface profilometer. The sheet-like structure of GO was observed on the surface of self-assembled coating. The BTSE molecule on the top layer of film covered the bottom completely, and the film exhibited good density and integrity. Through the potentiodynamic polarization curves, the GO/BTSE coating decreased the corrosion rate from 1.45×10?1 mm/a to 1.43×10?2 mm/a which was reduced by an order of magnitude. The fitting results of equivalent circuit in electrochemical impedance spectroscopy showed that GO/BTSE coating increased the value of Rt on Mg substrate from 562.2 Ω?cm2 to 1559 Ω?cm2. In addition, the wear test showed that Mg alloy had high coefficient of friction (COF) at the range of 0.32~0.42. The COF of sample with GO/BTSE coating was obviously decreased, which fluctuated at the range of 0.20~0.23. The coating on Mg substrate effectively reduced the wear rate from 3.51×10?3 mm3/(N×m) to 3.24×10?5 mm3/(N×m). The hydrogen bonds formed between GO sheets and BTSE molecule can effectively enhance the interaction between layers and contribute to the density of coating. Besides, the coating obviously improves the corrosion and wear resistance of Mg substrate. |
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