炭素鋼および低合金鋼中のマンガンの状態分析

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This work, a part of a general investigation on the state analysis of steel, was carried out to develop a systematic method for isolation and determination of manganese compounds in carbon steel and low alloy steel. 1. Isolation of manganese compound from steel. (a) The steel sample covered with close-texture filter paper as a diaphragm is, as an anode, dissolved into 130 ml of 1% NaCl-5% EDTA electrolyte (pH 6-7) at a current density of 50 mA/cm^2 for 2 hr. Remove the anode and the residue is collected into a beaker using methanol. (b) To the residue add 50 ml of 2% EDTA solution (pH 5∿6) and shake for 30 min. Filter and wash with water. To the filterate add 10 ml of HNO_3 and 10 ml of HClO_4, and evaporate to dense white fumes. Determine Mn as carbide in accordance with section 2. (c) Transfer a part of the electrolyte to a beaker. Add 15 ml of HNO_3 and 10 ml of HClO_4 and evaporate to dense white fumes. Determine Mn as solid solution in accordance with section 2. (d) Transfer the paper and residue (paragraph (b)) to a beaker, add 30 ml of 2% EDTA solution and 20 ml of 5% H_2O_2 and shake for 60 min. Filter and wash with water. To the filterate add 10 ml of HNO_3 and 10 ml of HClO_4 and evaporate to dense white fumes. Determine Mn as sulfide in accordance with section 2. (e) Transfer the paper and residue (paragraph (d)) to a beaker, add 30 ml of HNO_3 and 10 ml of HClO_4 and evaporate to dense white fumes. Determine Mn as oxide in accordance with section 2. 2. Determination of manganese Add 50 ml of water, 3 ml of H_2SO_4, 4 ml of H_3PO_4 and 20 ml of 5% NaIO_4 solution to each beakers (section 1 (b), (c), (d) and (e)), and boil for 5 min. Cool, dilute to 100 ml. Measure the absorbance of solution against water at 530 mμ.
社団法人日本鉄鋼協会の論文
1972-09-01

炭素鋼および低合金鋼中のマンガンの状態分析

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