Effects of micro-arc oxidation coating on corrosion behavior of Mg-Y-Zn in simulated body fluid

The application of magnesium and its alloy as degradable biomaterials is mainly confined due to its high degradation rate in physiological environment. This research focused on the effects of micro-arc oxidation (MAO) on biodegradable behavior of Mg-Y-Zn magnesium alloy in a simulated body fluid (SBF). The corrosion rate of alloys was gauged by means of hydrogen evolution volume measurement and mass-loss method. Scanning electron microscope (SEM) was utilized to observe the surface of the magnesium alloy and the cross-section of oxidation coating layer before and after corrosion. The Mg-Y-Zn alloy with thicker oxidation coating exhibited greater corrosion resistance during the immersion test for 240 h.     

EPS路基在地铁上方道路的设计应用

随着地铁建设和城市开发的不断推进,影响地铁结构安全的因素不断增加。影响因素的复杂化使地铁管理部门对各方面的控制越加严格。地铁上方道路建设应采取适当方法减轻或消除道路建设对地铁结构安全的影响。泡沫混凝土作为一种轻质材料层,被广泛应用于轨道交通结构上方的填筑路基。但是泡沫混凝土工后吸水率大,在复杂情况下已无法作为轨道交通结构上方填筑材料。为解决相关问题,本项目利用EPS轻质材料对地铁上方新建道路进行等效荷载路基换填处理,通过总结设计经验希望为其他相关项目的方案选择和设计提供参考。