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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。
The Fe 3 Si-Cu composites were prepared by ball-milling of Fe powder and Si powder with an atomic ratio of 3:1 for 20 h after being ground with a certain amount of Cu powder under the pressure of (1000 ± 30) ℃ and 20 MPa . The corrosion behaviors of Fe3Si-Cu composites with different mass fractions of Cu (5%, 10%) in 0.6, 0.7 and 0.8 mol / l NaOH solution were studied by immersion corrosion and electrochemical corrosion. The results show that the corrosion of the two materials in different molar concentrations of NaOH solution is a uniform and complete corrosion. In the composites, Fe3Si and Cu phases form a corrosion cell in NaOH solution, in which Fe3Si is the anode and Cu is the cathode. The self-corrosion potential of Fe3Si-5% Cu composite in NaOH solution increases with NaOH concentration The corrosion current of Fe3Si-10% Cu in three NaOH solutions is less than that of Fe3Si-10% Cu. The corrosion current of self-corrosion current is lower than 0.6 mol / l NaOH solution, the smallest, 0.7mol / l NaOH solution maximum.