アルミニウム合金の分光定量分析の研究(第2報)

Abstract

On the quantitative spectrographic analysis of Al-alloys, the accuracy of estimated results is chiefly influenced by the added elements. The author thought that this phenomenon depends mostly upon the metallic constitution and properties of the elements, etc., and in order to illustrate the cause he examined the two component, alloys. First of all by the spark discharge in the same condition of various Al-Si alloys, the eutectic alloy gives. the most weak spectrum line intensity at the spark condition of condenser capacity c=3000cm, self induction L=80000cm, and the calibration curve is refracted at this eutectic point. But under the protracted presparking or other spark discharge condition the curve becomes almost to the straight line. Of the Al-Cu alloys the same result is obtained at the eutectic point. In comparison with the calibration curves of Cu of the forged Al-Cu, (0.5_??_5%) alloys, -one was water-quenched from 500° after 2 hours heating and the other slowly cooled after 70 hours at 500° to room temperature - the curve of slowly cooled samples is bended in the spark condition c=3000cm, L=800000cm, and on the contrary almost straight line is obtained by the quenched one. For the purpose of ascertaining the distillation action of the elements by the spark discharge, the author studied with Al-Mg (4%) alloy in regard to the spectrum line intensity of neutral and ionized atom in the electrode gap as tine passes by, and confirmed the difference of intensity between ionized Al, Mg spectrum lines in the electrode gap. The above mentioned phenomenon is attributed to the influence of the added element. By the present author's examination on the effect of the alloying element, Zn on Al-Mg, Si on Al-Mg, Al- Fe, Mn on Al-Cu, the various amounts of added elements under the varying presparking time or spark discharge condition have the different effects respectively on the calibration curve.