Song Dan, Li Cheng, Zhang Liwen, Ma Xiaolong, Guo Guanghui, Zhang Fan, Jiang Jinghua, Ma Aibin
College of Mechanics and Materials, Hohai University, Nanjing 210098, China.
Suqian Research Institute of Hohai University, Suqian 223800, China.
Materials (Basel). 2017 Jul 27;10(8):858. doi: 10.3390/ma10080858.
In this study, we report an effective approach, pre-solid solution (SS) treatment, to reduce the in-vitro bio-degradation rate of the hydrothermal-synthesizing coated Mg-2Zn-Mn-Ca-Ce alloy in Hanks' solution. Pre-SS treatment alters the microstructure of alloys, which benefits the corrosion resistances of the substrate itself and the formed coating as well. The micro-galvanic corrosion between the secondary phase (cathode) and the α-Mg phase (anode) is relieved due to the reduction of the secondary phase. Meanwhile, coating formed on the SS-treated alloy was compacter than that on as-cast alloy, which provides better protection against initial corrosion.
在本研究中，我们报道了一种有效的方法——预固溶（SS）处理，以降低水热合成涂层的Mg-2Zn-Mn-Ca-Ce合金在汉克斯溶液中的体外生物降解速率。预固溶处理改变了合金的微观结构，这也有利于提高基体本身以及所形成涂层的耐腐蚀性。由于第二相的减少，第二相（阴极）和α-Mg相（阳极）之间的微电偶腐蚀得到缓解。同时，经固溶处理的合金上形成的涂层比铸态合金上形成的涂层更致密，从而提供了更好的初始腐蚀防护。
