al基可降解合金的制备及性能研究材料学专业论文.docxVIP

在50℃水中的分别在440 在50℃水中的分别在440 min和470 min内质量减少了50％。 对该合金的热处理结果表明，保温时间相同，热处理温度从300℃升高 到500℃时，铝基体晶粒从40～50 gm增长到70～80 1．tm。同时，第二相含量 明显减小，分布更加均匀，极化曲线表明其腐蚀电位略微负移，活性增大； 在300℃下延长保温时间，极化曲线表明合金腐蚀电位负移，降解活性增大， 在50℃水中反应速率明显大于铸态；在500℃下随保温时间延长，第二相 M92Sn由棒状变为球形，电化学测试表明合金的腐蚀电位正移，活性降低， 原因为球形的合金相与基体接触面积减小。 通过极化曲线和腐蚀微观形貌对该A1基可降解合金腐蚀行为分析表 明：腐蚀过程中，M92Sn合金相作阴极，A1基体作阳极，腐蚀反应从M92Sn 合金相周围以点蚀开始，点蚀在基体表面扩展导致了合金最后的均匀腐蚀。 关键词：A1一Mg合金，可降解，显微组织，腐蚀行为 万方数据 Research Research on the Preparation and Properties of Degradable AI Alloy ABSTRACT Because of the features of simple preparation，easily processing，forming and less pollution to environment，the degradable materials are widely used in the field of energy source industry and oil-gas exploitation．The common degradable polymeric materials and biodegradable ceramics can not meet the operating requlrements，because they are unable to bear high temperature and high pressure，easy deformation and restricted by the strict degradable condition． As a new kind of material，compared with the biodegradable polymer and ceranuc materials，the degradable metal has a vast application space which caused deeply concemed because of the rich resource，low cost，good mechanical properties，excellent electrical and thermal properties．and the advantages of best adaptability to the degradable environment．However，the single structure and the unstable degradable performance of degradable metal constrainted its widelV application in the field of oil—gas exploitation．In this paper,good comprehensive properties of degradable A1 metal were prepared successfully through the method of casting and incorporation of alloy elements Ga，Sn and In． In this thesis，the degradable A1 based alloy，which Can be used in the 0il’gas fracturing was prepared by casting method．The influences of alloy elements Sn，Ga and In and heat treatment process on the microstructure and performance of the A1 matrix degradable alloy was studied by X—ray diffraction (XRD)，scanning electron microscope(SEM)and energy spectr