Characterization of non-metallic inclusion in DZ125 alloy by small sample electrolysis
SONG Shuang1,2, TAN Yi*1,2, LI Yi1,2, WANG Yilin1,2, LI Pengting1,2
1. School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China; 2. Laboratory for New Energy Material Energetic Beam Metallurgical Equipment Engineering of Liaoning Province,Dalian University of Technology,Dalian 116024,China
Abstract：The electrolysis time of large sample electrolysis method is long, and the required sample amount is large. Moreover, the electrolysis effect of small-sized non-metallic inclusions in nickel-based superalloys with high-purity is not good. Therefore, the electrolysis effect of different electrolysis parameters was compared by selecting the appropriate electrolyte based on the principle of electrochemistry. The small sample electrolysis method was developed to characterize the non-metallic inclusions in DZ125 alloy, and the detection results were compared with those obtained by Aspex scanning electron microscopy. The specific steps of final small sample electrolysis method were as follows: the preparation of standard size electrolyteic test rods; the treatment of semipermeable membrane; the preparation of electrolyte, i.e., 30 g/L C6H8O7 + 15 g/L C6H11NO7 + 15 g/L (NH4)2SO4 + deionized water. During the electrolysis in electrolysis device, the potential was 1.84 V, the current density was 420 mA/cm2, and the electrolyte was replaced every 10 h until the immersed test rod was completely electrolyzed. After electrolysis, the anode slime in the semi-permeable membrane was collected using 0.45 μm microporous membrane by vacuum filtration. Subsequently, the non-metallic inclusions were separated by pickling. Finally, the corresponding detection analysis was conducted. The results of repeated experiments showed that the small sample electrolysis method was basically the same with and Aspex scanning electron microscopy in the detection of inclusion type and content, which could be used as a metallurgical analysis method for non-metallic inclusions in DZ125 alloy.
宋爽, 谭毅, 李毅, 王以霖, 李鹏廷. 小样电解法表征DZ125合金中非金属夹杂物的探究[J]. 冶金分析, 2023, 43(11): 1-11.
SONG Shuang, TAN Yi, LI Yi, WANG Yilin, LI Pengting. Characterization of non-metallic inclusion in DZ125 alloy by small sample electrolysis. , 2023, 43(11): 1-11.
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