Enhanced corrosion and wear resistances by graphene oxide coating on the surface of Mg-Zn-Ca alloy
Enhanced corrosion and wear resistances by graphene oxide coating on the surface of Mg-Zn-Ca alloy
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Mg-Zn-Ca合金表面氧化石墨烯涂层增强耐腐蚀性和耐磨性
DOI：
10.1016/j.carbon.2016.08.032
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发表时间：
2016-11
期刊：
影响因子：
10.9
通讯作者：
H.J. Zhang
中科院分区：
文献类型：
--
作者：
L.B. Tong;J.B. Zhang;C. Xu;X. Wang;S.Y. Song;Z.H. Jiang;S. Kamado;L.R. Cheng;H.J. Zhang
镁及镁合金的耐蚀性和耐磨性较差，阻碍了其工业应用。采用硅烷偶联剂在挤压镁锌钙合金表面制备了氧化石墨烯（GO）涂层。GO涂层通过化学反应完全覆盖在Mg基体上，并通过互锁效应形成重叠的多层结构。电化学测试结果表明，硅烷/GO涂层能显著提高镁合金的耐蚀性能，涂层内稳定的共价键有效地限制了电解液向镁合金表面的渗透，表现出良好的腐蚀阻挡效果。GO涂层显著提高了镁基体和GO片之间的上级结合，具有高硬度和良好的润滑效果，从而显著提高了耐磨性。
The poor corrosion and wear resistances hinder the industrial applications of magnesium and its alloys. In this paper, a new graphene oxide (GO) coating is fabricated on the surface of extruded Mg-Zn-Ca alloy, via the silane coupling agent. The GO coating has fully covered the Mg substrate through the chemical reactions, and formed an overlapped multilayer structure by interlocked effects. Electrochemical measurements indicate that the anti-corrosion performance can be remarkably improved by silane/GO coating, because the stable covalent bonds within the coating effectively restrict the penetration of electrolyte into the Mg surface, representing an excellent corrosion barrier effect. The GO coating drastically promotes the wear resistance, due to the superior bonding between the Mg substrate and GO sheets with high hardness and good lubricant effect.
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