挤压态低合金化Mg-0.5Bi-0.5Sn-0.5Ca合金的力学性能及腐蚀行为研究  

Mechanical Properties and Corrosion Behavior of an Extruded Dilute Mg-alloy Mg-0.5Bi-0.5Sn-0.5Ca

作　　者：张全福 宋蕾 王建 郭振宇 任乃栋 赵建琪 武维康 程伟丽[2] ZHANG Quanfu;SONG Lei;WANG Jian;GUO Zhenyu;REN Naidong;ZHAO Jianqi;WU Weikang;CHENG Weili(Xiaoyi Dongyi Magnesium Industry Co,Ltd.,Xiaoyi 032308,China;College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]孝义市东义镁业有限公司,孝义032308 [2]太原理工大学材料科学与工程学院,太原030024

出　　处：《中国腐蚀与防护学报》2023年第2期428-434,共7页Journal of Chinese Society For Corrosion and Protection

基　　金：山西省留学回国人员资助项目(2019032);山西省镁合金重大科技专项(20191102008)。

摘　　要：探究了复合添加微量Sn与Ca对挤压态Mg-0.5Bi基合金的微观组织、力学性能及腐蚀行为的影响。结果表明:挤压态Mg-0.5Bi-0.5Sn-0.5Ca (质量分数,%)合金主要由α-Mg、Mg_(2)Bi2Ca以及Mg_(2)Sn相组成,合金表现出晶粒尺寸均匀分布的完全动态再结晶组织。合金的抗拉强度(UTS)为191 MPa,伸长率(EL)高达31.5%,腐蚀速率(Pi)为0.51 mm/a,极化阻抗(R_(p))为707.19Ω·cm^(2)。此外,挤压态合金在腐蚀过程中生成了含Ca以及含Sn的腐蚀产物中间层,从而提升了腐蚀产物层的保护作用,导致析氢速率随着浸泡时间的增加先增大后减小。最后由于腐蚀产物膜的破裂,析氢速率达到了2.43 mL/d。Due to its rapid corrosion rate,the mechanical support function of Mg-alloy implants will be lost in a short time after implantation.Mg-Bi based alloys have attracted much attention in biomedical field because of their non-toxic,excellent biocompatibility and corrosion-resistance.However,the low strength restricts the wide application of Mg-Bi binary alloy.Therefore,the effect of Sn and Ca addition on the microstructure,mechanical properties and corrosion behavior of extruded Mg-0.5Bi-based alloy was investigated in the present article.The results indicated that the extruded Mg-0.5Bi-0.5Sn-0.5Ca (mass fraction,%) alloy consists mainly of phases α-Mg,Mg_(2)Bi2Ca and Mg_(2)Sn,and the alloy presents a fully recrystallized microstructure and uniform grain size distribution.The alloy possesses ultimate tensile strength (UTS) of 191 MPa with elongation at break (EL) of 31.5%.In addition,its corrosion rate (Pi) is0.51 mm/a and polarization resistance (Rp) is 707.19Ω·cm^(2).The hydrogen evolution rate initially increased and then decreased with increasing immersion time due to the formation of Sn and Ca-containing products.Finally,the hydrogen evolution rate reached 2.43 mL/d,which is related to the broken of corrosion product film.

关 键 词：Mg-Bi基合金 微观组织 力学性能 强化机制 腐蚀行为 

分 类 号：TG146[一般工业技术—材料科学与工程]