夹杂物对工业纯铝组织性能的影响.pdfVIP

学兔兔 Aug．2009 铸 造 Vo1．58 NO．8 FOUNDRY ·827· 夹杂物对工业纯铝组织性能的影响 许征兵 ．一，王文超 ，庞兴志 ，曾建民 (1．西北．Y-,Jk大学凝固技术国家重点实验室，陕西西安710072； 2．广西大学有色金属及其加工新技术教育部重点实验室，广西南宁530004) 摘要：采用电化学分析、显微金相和图象分析、力学性能测量方法，研究了纯铝中夹杂物含量以及夹杂物形态对组 织、电化学性能和力学性能的影响。得出腐蚀电位 、腐蚀电流密度 和纯铝中夹杂物含量的关系；测试了不同夹杂 物含量的工业纯铝的硬度和延展性。试验结果表明：铝屑引入了大量的夹杂物，纯铝中夹杂物含量随着铝屑的增加而 增多；试验材料的腐蚀电位逐渐向负方向移动，腐蚀电流密度变大，表明材料耐腐蚀性能随着夹杂物的增加而下降； 材料的硬度有轻微增加，延展性降低，塑性变差。 关键词：工业纯铝；夹杂物；组织；电化学性能；力学性能 中图分类号：TG146．2 l；TG292 文献标识码：A 文章编号：1001—4977(2009)08—0827—04 Effects of I nclusion on Microstructure and Properties of IndustriaI Pure AIuminUm XU Zheng—bing’· ，WANG Wen—chao ，PANG Xing—zhi ，ZENG Jian—min (1．State Key Laboratory of Solidification Processing，Northwest Polytechnic University，Xi’an 71 0072 Shaanxi，China；2．Key Laboratory of Nonferrous Materials and New Processing Technology， Guangxi University，Nanning 530004，Guangxi，China) Abstract：The effects of the morphology and content of inclusions on microstructure．electrochemical and mechanicaI properties of pure aIuminum were investigated by using of electrochemicaI measurement，opticaI microscope(OM)image analysis，and mechanical test．The relationship of corrosion potential E and corrosion current density f with inclusion content was obtained．The HV hardness test and the ductility comparison of the materials with inclusion content were conducted． The results show that the addition of aIuminum scraps introduces a Iarge number of inclusions．With the increasing of aluminum scraps．the corrosion potentials of the materiaI move to more negative