| 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],48(3):62-68 |
| Effect of Graphene Oxide/Silane Self-assemble Coating on Corrosion and Wear Resistance of Mg Alloy |
| Received:November 29, 2018 Revised:March 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.03.009 |
| KeyWord:Mg alloy self-assemble coating GO silane corrosion resistance wear resistance |
| Author | Institution |
| CHU Jing-hui |
1.Jilin University, Changchun , China; 2.Xi'an University of Architecture and Technology, Xi'an , China |
| TONG Li-bo |
2.Xi'an University of Architecture and Technology, Xi'an , China |
| JIANG Zhong-hao |
1.Jilin University, Changchun , China |
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| Abstract: |
| 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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