Study on the extraction of tiny inclusions in steel by neutral salt electrolysis
DENG Jun-hua*1, 2，KONG Xiang-hua2，WANG Shuai2，ZHAI Xu2，LIU Hu2， SHEN Kui2
1．Technology Center of Angang Steel Co.,Ltd., Anshan 114009, China；2．Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
Abstract：An extraction method of tiny inclusions in steel by electrolysis in laboratory environment was proposed. In this method, 6 g/L sodium citrate, 10 g/L sodium chloride, 30 g/L ferrous sulfate and 10 g/L ammonium fluoride were used as electrolyte, and graphite plate was used as the cathode. After extracting the inclusions in pipe line steel and electrical steel by this method, the morphology observation and component analysis of inclusions were conducted using scanning electron microscope and X-ray energy disperse spectroscopy. The results showed that many spherical nano-inclusions existed in the obtained tiny inclusions from pipe line steel. These inclusions were the dispersion strengthening phase in low-carbon bainite steel. They contained strengthening and toughening alloy elements, and had important influence on the drop weight property of pipe line steel. The obtained non-metallic inclusions from electrical steel contained some deformed inclusions. They would be changed to plate shape in the rolling process of steel, which had influence on the rolling property of steel. This method not only could extract some carbide inclusions which were harmful to steel, but also could extract other tiny inclusions which were corroded in acid or alkaline conditions. Moreover, the morphology of inclusions was completely kept, and the composition was not influenced by electrolyte. Therefore, this method could be used for the inclusion analysis of low-carbon bainite steel and electrical steel which had high requirements on structure purity.
邓军华*，孔祥华，王帅，翟旭，刘虎，沈奎. 中性盐电解提取钢中微细夹杂物研究[J]. 冶金分析, 2011, 31(8): 6-11.
DENG Jun-hua*，KONG Xiang-hua，WANG Shuai，ZHAI Xu，LIU Hu， SHEN Kui. Study on the extraction of tiny inclusions in steel by neutral salt electrolysis. , 2011, 31(8): 6-11.
