扩渗工艺参数对纯镁表面渗锌合金化的影响  

Effect of technological parameters on surface Zn-alloying for pure magnesium

作　　者：马幼平[1] 杨蕾[1] 刘玉高[2] 张远芬[1] 

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055 [2]莱阳农学院机电工程学院,山东青岛266109

出　　处：《西安建筑科技大学学报（自然科学版）》2007年第1期131-135,共5页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：陕西省科技厅攻关项目(2004E111)

摘　　要：对纯镁进行了表面渗锌处理,研究了扩渗温度及扩渗时间对于合金化渗层组织、相结构及反应层连续性的影响.研究结果表明:扩渗温度的选择有一个合适的范围:温度过低,Zn元素原子的能量达不到其激活能,不能产生活性原子,扩渗速度太慢,扩渗过程无法进行;扩渗时间的延长会促使Zn的进入量和金属间化合物的生成量增加,最终使固溶层和反应层获得一定的厚度.要形成一定厚度的反应层,扩渗温度的应控制在400-420℃,相应的扩渗时间为8h以上.Surface Zn-alloying modification was used to treat pure magnesium in this paper. The effect of diffusion temperature and time on the alloyed microstructure,phase structure and the continuity of alloyed layers were investigated . The results show that there is a reasonable range for the diffusion temperature： If the diffusion temperature is too low, because of no activate Zn atoms generated, the diffusion rate will also be too slow for the diffusion process to carry on. The prolongation of diffusion time can accelerate the flow of Zn atoms into Mg substrate and the formation of intermetallic compound, resulting in the uniformity of solution zone and reacted zone with a definite width. In order to obtain a continuous reacted zone, the diffusion temperature has to be controlled within 400℃-420℃ and the corresponding diffusion time has to be over 8 hours.

关 键 词：扩散温度 扩散时间 金属间化合物 

分 类 号：TG146.21[一般工业技术—材料科学与工程]