热压烧结Fe_3Si-Cu在NaOH溶液中的腐蚀行为  

Corrosion behavior of hot-pressing sintered Fe_3Si-Cu composite in NaOH solution

作　　者：贾建刚[1,2] 窦萍[1] 季根顺[1,2] 郭铁明[1,2] 安亮[1] 马勤[1,2] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室,甘肃兰州730050 [2]兰州理工大学有色金属合金省部共建教育部重点实验室,甘肃兰州730050

出　　处：《材料热处理学报》2012年第1期54-59,共6页Transactions of Materials and Heat Treatment

基　　金：国家自然科学青年基金项目(51001057)

摘　　要：以原子比为3∶1的Fe粉和Si粉球磨20 h后与一定量的Cu粉混合,在(1000±30)℃,20 MPa的压力下热压烧结制备了致密的Fe3Si-Cu复合材料。通过浸泡腐蚀和电化学腐蚀两种方法研究加入不同质量分数Cu(5%,10%)的Fe3Si-Cu复合材料在0.6、0.7和0.8 mol/l的NaOH溶液中的腐蚀行为。结果表明,两种材料在不同摩尔浓度的NaOH溶液中的腐蚀是一种均匀的全面腐蚀。复合材料中的Fe3Si和Cu两相在NaOH溶液中组成一腐蚀电池,其中Fe3Si为阳极发生腐蚀,Cu作为阴极得到保护;Fe3 Si-5%Cu复合材料在NaOH溶液中的自腐蚀电位随NaOH浓度的增加而增加,自腐蚀电流在0.7 mol/l的NaOH溶液中最低;Fe3 Si-10%Cu在三种浓度的NaOH溶液中的自腐蚀电位相差较小,自腐蚀电流在浓度为0.6 mol/l的NaOH溶液中最小,在0.7mol/l的NaOH溶液中最大。Mixture of Fe and Si powders in a atom ratio of 3：1 was ballmilled for 2 h and them blended with Cu powder. Fe3Si-Cu composites were prepared by hotpressing sinter process under 20 MPa at i000 ℃ using the blended powders. Corrosion behavior of the as sintered F%SiCu composites containing different content of Cu （5% , 10% ） in NaOH solution were studied by immersing corrosion and electrochemical corrosion method. The results show that the two composites present uniform corrosion in NaOH solution with different concentrations. Fe3Si phase and Cu phase in the Fe3Si-Cu composite constitute a corrosion cell in NaOH solution. The Fe3Si phase is corroded as anode and the Cu phase is protected as cathode. The corrosion potential （EoorT） of Fe3Si-5% Cu in NaOH solution increases with the increasing concentration of NaOH solution. The corrosion current of Fe3Si-5% Cu is lowest in 0.7 mol/l NaOH solution. The E of Fe3Si-10% Cu shows little difference in different concentration NaOH solutions. The corrosion current of Fe3Si-10% Cu shows lowest value in 0. 6 mol/1 NaOH solution and highest value in 0. 7 mol/1 NaOH solution.

关 键 词：热压烧结Fe3Si-Cu 浸泡腐蚀 电化学腐蚀 NAOH溶液 

分 类 号：TG133.4[一般工业技术—材料科学与工程]