CAJ | 학술논문

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。
채용원소분말반응합성적방법병용뇨소작위조공제제비Ni3Al금속간화합물다공재료。용전화학화침포실험표정Ni3Al금속간화합물다공재료재6 mol/L KOH용액중적항부식행위。계통연구공결구대재료항부식성능적영향。연구결과표명：공극솔교대적Ni3Al금속간화합물다공재료교공극솔교소적양품부식경엄중，저시유우공극솔교대적양품구유복잡적련통공결구이급교대적비표면적。연이，재료적부식속솔여비표면적병불성정비，저시인위수착공극솔적증대，재료적공경대소、공경분포이급공극형상도수지변화。불동공극솔대소적Ni3Al금속간화합물다공재료재감용액중균표현출교호적항부식성능。
Porous Ni3Al intermetallics were fabricated by elemental powder reactive synthesis method, using carbamide powders as space holders. Corrosion behavior of porous Ni3Al intermetallics was investigated in a 6 mol/L KOH solution using electrochemical methods and immersion test. Effect of porous structures on the corrosion behavior of the porous Ni3Al intermetallics was studied. The results indicate that the porous Ni3Al intermetallics with higher porosities suffer more serious corrosion than the ones with lower porosities because the complicated interconnected porous structures and the large true surface areas exist in the samples with a higher porosity. But the corrosion rates of the porous Ni3Al intermetallics are not proportional to the true surface areas. The reason is that the pore size, pore size distribution and pore shape of the porous Ni3Al intermetallics change with the increasing porosity. All the porous Ni3Al intermetallics with different porosities exhibit excellent corrosion resistance in a strong alkali solution.