锌含量对铝基可降解合金降解速率的影响  

Influence of Zn Content on the Degradation Rates of Degradable Aluminum Alloys

作　　者：郭思文[1] 邵媛[1] 古正富[1] 任国富[1] 张华光[1] GUO Siwen;SHAO Yuan;GU Zhengfu;REN Guofu;ZHANG Huaguang(Oil and Gas Technology Institute of Changqing Oilfield Company,Xi’an 710018)

机构地区：[1]长庆油田分公司油气工艺研究院,西安710018

出　　处：《材料导报》2018年第6期947-950,960,共5页Materials Reports

基　　金：低渗透油气田勘探开发国家工程实验室开放课题(16GJ-KF-002)

摘　　要：以Al-Mg-Ga-In-Sn合金为基体,采用熔融工艺制备了不同Zn含量的可降解铝合金材料。通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)和电化学工作站分析了Zn含量对可降解铝合金相组成、显微结构和电化学参数的影响规律。降解速率的测定在90℃恒温的蒸馏水中进行。结果表明:合金析出相的组成、数量和形貌是影响合金降解速率改变的重要因素。随着Zn元素的加入,主要析出相由短棒状的Mg_2Sn转变为树枝状或网络状的Mg_(32)(AlZn)_(49),而合金的降解总是沿着细小的球状富Mg、In析出相开始并围绕其向周围扩展。然而大量的Mg被Mg_(32)(AlZn)_(49)相结合,使得腐蚀区域明显减少,降解速率降低,因此,Mg_(32)(AlZn)_(49)起到延缓合金降解的作用。此外,随着Zn含量的增加,合金的腐蚀电位均不同程度地正移,腐蚀电流逐渐减小,使得合金的腐蚀倾向减弱,降解速率降低。The degradable aluminum alloys of different Zn content were prepared by melting technique based on the Al-Mg-Ga-In-Sn alloy.The effect of different Zn content on phase compositions,microstructure and electrochemical parameters of the degradable aluminum alloys were analyzed by X-ray diffraction(XRD),scanning electron microscope(SEM)and electrochemical workstation.In addition,the degradation rates were conducted in distilled water at 90℃.Experimental results showed that the composition,amount and morphology of the precipitates in alloys played an important role in changing the degradation rates.As the increa-sing Zn content,the main precipitation was changed to the dendritic or the network Mg 32(AlZn)49 from the clavate Mg 2Sn.The degradation of alloys always started along the globular phase which was rich in Mg-In,and spread around it.Obviously,a large amount of Mg was combined into the Mg 32(AlZn)49 precipitation,which made both the corrosion proportion and the degradation rate decrease.Therefore,the Mg 32(AlZn)49 can delay the degradation of alloys.Moreover,the E corr of alloys was shifted to positive values in varying degrees and the i corr decreased gradually.For this reason,the corrosion trend of alloys weakened and the degradation rate decreased in the end.

关 键 词：锌含量 相组成 微观结构 极化曲线 降解速率 

分 类 号：TU512.4[建筑科学—建筑技术科学]