热压烧结Fe_3Si-10%Cu复合材料在稀H_2SO_4中的腐蚀行为  

Corrosion behavior of the hot-pressing sintered Fe_3Si-10%Cu composite in dilute H_2SO_4

作　　者：雒向东[1] 安亮[2] 

机构地区：[1]兰州城市学院培黎工程技术学院,甘肃兰州730070 [2]兰州工业学院材料学院,甘肃兰州730050

出　　处：《西北师范大学学报（自然科学版）》2014年第6期33-37,共5页Journal of Northwest Normal University(Natural Science)

基　　金：甘肃省高等学校研究生导师科研基金资助项目(1011B-03)

摘　　要：采用机械合金化制粉/热压烧结制备了Fe3Si-10%Cu复合材料,研究了其在0.4,0.6和0.8 mol·L-1的稀H2SO4中的浸泡腐蚀行为.结果表明,Fe3Si-10%Cu复合材料在稀H2SO4中表现出腐蚀失重,且随H2SO4浓度增加材料的腐蚀速率降低;复合材料中Fe3Si和Cu两相在H2SO4溶液中形成了一个腐蚀电池,其中Fe3Si相为阳极,发生腐蚀,Cu为阴极,得到保护;电化学腐蚀测试表明,Fe3Si-10%Cu复合材料在0.4,0.6和0.8mol·L-1的H2SO4溶液中自腐蚀电位相当,且在0.4 mol·L-1溶液中具有最低的自腐蚀电流和维钝电流.在0.6和0.8 mol·L-1的H2SO4溶液中,阳极反应产物以SiO2形态附着在Fe3Si-10%Cu材料表面导致腐蚀速率下降.Fe3 Si-10%Cu composite is prepared by hot-pressing sintering mechanically alloyed powders. Corrosion behavior of Fe3 Si-10% Cu composite in 0.4, 0.6 and 0.8 mol·L-1 H 2 SO4 are studied by immersing corrosion method.It is found that Fe3 Si-10%Cu composite appears weight loss in dilute H 2 SO4 of different concentration.The corrosion rate of the composite decreases with increasing concentration of H 2 SO4 .The Fe3 Si phase and Cu phase of the Fe3 Si-10%Cu composite constitute a corrosion cell in H 2 SO4 solution.The Fe3 Si phase is corroded as the anode and the Cu phase is protected as the cathode.The corrosion potential difference of the Fe3 Si-10%Cu composite in 0.4,0.6 and 0.8 mol·L-1 H 2 SO4 solution is very small.The corrosion current and maintaining passivity current in 0.4 mol·L-1 H 2 SO4 solution are the lowest of those in the three dilute H 2 SO4 solutions.The SiO2 ,production of the anode reaction, attaching to the Fe3 Si-10%Cu composite surface is responsible for the decreasing corrosion rate in 0.6 and 0.8 mol·L-1 H 2 SO4 solution.

关 键 词：热压烧结Fe3Si-10%Cu 腐蚀失重 电化学腐蚀 稀H2SO4 

分 类 号：TB304[一般工业技术—材料科学与工程]