鋼中カルシウム分析法の研究

概要

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An experiment was carried out to establish an accurate spectrophotometric method for the determination of very little amount of calcium in steels by glyoxal-bis (2-hydroxyanil). The forms of calcium compounds in steel were examined by an electron microscopic observation and an electron diffraction. The results obtained are as follows ; (1) The interfering elements were completely isolated by extraction with β-diketones in benzene at pH5.0∿5.5. (2) Very low content of calcium in steel even in ppm order was made possible to be determined by the present method. (3) Calcium in steels normally exists as non-metallic inclusions. The calcium compounds in the steels for this experiment were identified to be crystalline types CaO SiO_2(α), 2CaO SiO_2(α), and CaO SiO_2(β). (4) However, calcium in the experimental steels containing 1% to 5% soluble Al was found to be in solid solution predominantly.
社団法人日本鉄鋼協会の論文
1970-08-01