Effect of Texture on Biodegradable Behavior of an As-Extruded Mg–3%Al–1%Zn Alloy in Phosphate Buffer Saline Medium  

作　　者：Baojie Wang Daokui Xu Junhua Dong Wei Ke 

机构地区：[1]Environmental Corrosion Center. institute of Metal Research. Chinese Academy of Sciences, 5henyang 110016, China

出　　处：《Journal of Materials Science & Technology》2016年第7期646-652,共7页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China under Grant Nos.51271183 and 51301172;the National Basic Research Program of China(973 Program)under Grant No.2013CB632205;the Innovation Fund of Institute of Metal Research(IMR);Chinese Academy of Sciences(CAS)

摘　　要：In this work, the corrosion behavior of two differently oriented surfaces of an as-extruded Mg-3%Al- 1%Zn （AZ31） bar in a simulated body fluid of phosphate buffer saline （PBS） medium was investigated and compared, and the effect of crystallographic texture on corrosion resistance of the alloy was deeply described. The results showed that at the early stage of immersion, a layer of compact and flat film formed easily on surfaces of both oriented samples. With prolonged immersion time, the degradation of formed corrosive films started and their severity was quite sensitive to the composed crystallographic planes of sample surfaces. For the surface containing highly concentrated orientation of {10-10} and {11-20} prism planes, the degradation of formed corrosive film was quite slight and only occurred at some particular sites even after immersion for 48 h. Thus, the film could keep good corrosive protection to the under- neath substrate. However, for the surface containing [0002} basal planes, {10-10} and {11-20} prism planes, the degradation of corrosive production film occurred widely, resulting in further decrease in the corrosion resistance of immersed samples,In this work, the corrosion behavior of two differently oriented surfaces of an as-extruded Mg-3%Al- 1%Zn （AZ31） bar in a simulated body fluid of phosphate buffer saline （PBS） medium was investigated and compared, and the effect of crystallographic texture on corrosion resistance of the alloy was deeply described. The results showed that at the early stage of immersion, a layer of compact and flat film formed easily on surfaces of both oriented samples. With prolonged immersion time, the degradation of formed corrosive films started and their severity was quite sensitive to the composed crystallographic planes of sample surfaces. For the surface containing highly concentrated orientation of {10-10} and {11-20} prism planes, the degradation of formed corrosive film was quite slight and only occurred at some particular sites even after immersion for 48 h. Thus, the film could keep good corrosive protection to the under- neath substrate. However, for the surface containing [0002} basal planes, {10-10} and {11-20} prism planes, the degradation of corrosive production film occurred widely, resulting in further decrease in the corrosion resistance of immersed samples,

关 键 词：Mg alloyCorrosion resistanceTextureBiodegradationSurface film 

分 类 号：TG178[金属学及工艺—金属表面处理]