Zn含量对Mg-Zn合金在模拟体液中腐蚀行为的影响  

Effects of Zn concentration on corrosion behavior of Mg-Zn magnesium alloy in simulated body fluid

作　　者：封娜[1] 王元有[1] 严凯[2] 费洪旗 宋奎[2] FENG Na;WANG Yuan-you;YAN Kai;FEI Hong-qi;SONG Kui(College of chemical engineering Yangzhou Polytechnic Institute,Yangzhou 225127,China;Yangzhou university college of mechanical engineering,Yangzhou 225127,China)

机构地区：[1]扬州工业职业技术学院化学工程学院,江苏扬州225127 [2]扬州大学机械工程学院,江苏扬州225127

出　　处：《化学研究与应用》2019年第7期1342-1346,共5页Chemical Research and Application

基　　金：国家自然科学基金项目(51301151)资助;江苏省高校自然科学基金项目(13KJB430026)资助;江苏高校品牌专业建设工程资助项目(PPZY2015B180)资助;扬州市市校合作专项项目(YZ2018148)资助

摘　　要：采用析氢实验、扫描电子显微镜和X射线衍射等研究经过固溶处理的纯Mg和镁锌合金模拟体液中的腐蚀行为。结果表明:几种镁锌合金的腐蚀速率远低于纯镁,镁锌合金的腐蚀速率随着Zn含量降低而降低。固溶处理降低了晶界数量和位错密度,减少了晶间腐蚀和点蚀的发生,随着第二相含量增加造成相界面增加,暴露在表面的相界面成为电偶腐蚀发生的位置,因此本研究中镁锌合金的腐蚀以电偶腐蚀以主。显微组织观察发现纯镁的表面腐蚀产物比较疏松,而Zn的加入使镁锌合金在模拟体液中的腐蚀产物变得平整致密,但随着Zn含量的提高,第二相的体积分数上升,腐蚀产物的裂纹增大,造成腐蚀速度上升。The corrosion behaviors of pure Mg and Mg-Zn alloys in simulated body fluid(SBF)were studied by the hydrogen evolution test,scanning electron microscopy(SEM),and X-ray diffraction(XRD).Result show that the corrosion rate of Mg-Zn alloys is much lower than that of pure mg and the corrosion rate decrease with the increasing of Zn concentration in Mg-Zn alloys.solution-treatment reduce the grain boundaries and dislocations density in Mg-Zn alloys which inhibit the intergranular corrosion and pitting corrosion,thus the main corrosion type is galvanic corrosion in phase interfaces.The corrosion products of pure Mg after immersion is porous and the surface of Mg-Zn alloys is compact,however the crack width of corrosion product in Mg-Zn alloys is raised with the increasing of second phase volume fraction,which accelerates the corrosion rate of Mg-Zn alloys in hank's solution.

关 键 词：镁合金 生物材料 模拟体液 降解行为 固溶处理 

分 类 号：O614.24[理学—无机化学]