新電解抽出法による鋼中の析出物, 介在物の抽出分離

概要

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A new simple and reliable anodic dissolution technique using NaCl-EDTA (ethylenediaminetetraacetic acid) solution as an electrolyte has been developed for isolation of precipitates and inclusions from various steels. The steel sample covered with close-texture filter paper as a diaphragm and connected as an anode, is dissolved into 100 to 250ml of 1% NaCl-5% EDTA electrolyte (pH 6-7) at a current density of 50mA/cm^2 for 2 to 4 hr. A residue of carbide, nitride, oxide and other constituent can be collected in the filter paper, and is separated and analyzed by a chemical procedure as directed in previous papers 1) 2). To the electrolyte, HNO3, HClO4 and H_2SO_4 are added and subsequently, it is evaporated to dense white fumes, and then the element as solid solution is determined by a chemical procedure similar to the above. NaCl-EDTA solution as an electrolyte gives good results than various electrolytes reported previously. Quantitative recovery of precipitates and inclusions from steel is obtained by using the NaCl-EDTA electrolyte. The method is applicable to the electrolytic isolation of precipitates and inclusions from low carbon steel, high carbon steel, low alloy steel and high alloy steel such as stainless steel with the same electrolytic condition.
社団法人日本鉄鋼協会の論文
1969-12-01