Magnesium alloys are promising for hard tissue implants due to stupendous advantages including biodegradability and similar mechanical properties to natural bone. However, high degradation rate in body environment is main disadvantage for widespread applications of Mg alloys. In the present study, the alloy of Mg-4 % Zn- 4 % Sn-0.6 % Ca-0.5 % Mn was at first prepared by casting and subsequent extrusion, then was coated by hydroxyapatite/chitosan (HA/CS) with different graphene oxide (GO) composite through electrophoretic deposition method (EPD). The effect of GO value and electrodeposition potential were studied on the morphology, chemical features and corrosion behavior of coating. Accordingly, coated samples were characterized by Fourier Transformation Infrared (FTIR) spectroscopy, Scanning Electron Microscopy (SEM) and Electrochemical Impedance Spectroscopy (EIS) analysis. The results revealed the improvement of corrosion resistance for all coated samples and the optimum values of additional GO and applied potential were found to be 1 % and 150 V, respectively. The microstructure of the coatings showed a significant relationship between the soundness of coating and corrosion resistance due to the formation of well dispersed, low porosity and relatively dense composite coating.

镁合金具有巨大的优势，包括可生物降解性和与天然骨骼相似的机械性能，因此有望用于硬组织植入物。然而，人体环境中的高降解率是镁合金广泛应用的主要缺点。在本研究中，Mg-4 % Zn-4 % Sn-0.6 % Ca-0.5 % Mn 合金首先通过铸造和随后的挤压制备，然后用不同的石墨烯涂覆羟基磷灰石/壳聚糖（HA/CS）通过电泳沉积法（EPD）的氧化物（GO）复合材料。研究了GO值和电沉积电位对涂层形貌、化学特征和腐蚀行为的影响。因此，涂层样品通过傅里叶变换红外 (FTIR) 光谱进行表征，扫描电子显微镜 (SEM) 和电化学阻抗谱 (EIS) 分析。结果表明，所有涂层样品的耐腐蚀性得到改善，并且发现额外的 GO 和施加电位的最佳值分别为 1% 和 150 V。由于形成分散良好、孔隙率低且相对致密的复合涂层，涂层的微观结构显示涂层的坚固性和耐腐蚀性之间存在显着关系。