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采用元素粉末反应合成的方法并用尿素作为造孔剂制备Ni3Al金属间化合物多孔材料。用电化学和浸泡实验表征Ni3Al金属间化合物多孔材料在6 mol/L KOH溶液中的抗腐蚀行为。系统研究孔结构对材料抗腐蚀性能的影响。研究结果表明:孔隙率较大的Ni3Al金属间化合物多孔材料较孔隙率较小的样品腐蚀更严重,这是由于孔隙率较大的样品具有复杂的联通孔结构以及较大的比表面积。然而,材料的腐蚀速率与比表面积并不成正比,这是因为随着孔隙率的增大,材料的孔径大小、孔径分布以及孔隙形状都随之变化。不同孔隙率大小的Ni3Al金属间化合物多孔材料在碱溶液中均表现出较好的抗腐蚀性能。
Ni3Al intermetallic compound porous material was prepared by elemental powder reaction synthesis method and urea as pore forming agent. The corrosion resistance of Ni3Al intermetallic compound porous material in 6 mol / L KOH solution was characterized by electrochemical and immersion experiments. The effect of pore structure on corrosion resistance of materials was systematically investigated. The results show that the porous Ni3Al intermetallics with larger porosity corrode more seriously than those with smaller porosity. This is because the samples with larger porosity have complicated interlinked pore structure and larger specific surface area. However, the corrosion rate of the material is not proportional to the specific surface area, because as the porosity increases, the pore size, pore size distribution and pore shape of the material all change. The Ni3Al intermetallic compound porous materials with different porosity show good corrosion resistance in alkaline solution.