クロメート浴管理用 Cr^<6+> 及び Cr^<3+> 連続分析計の開発

概要

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The concentration of Cr^<6+> and Cr^<3+> in the chromate treating solution must be maintained exactly at the constant levels for getting the good coating. We studied in detail about the absorption curves of Cr^<6+> and Cr^<3+> to develop the most suitable analyzer of Cr^<6+> and Cr^<3+> for the process control in the chromate treating plants. It was found out at the result of this study that the best method was to measure the absorbance at around 545nm and 620nm with the two wavelength spectrophotometer to determine Cr^<6+> and Cr^<3+>. This colorimeter could be manufactured easily by the simple combination of the I.C. units. 0∿20000ppm of Cr^<6+> and 0∿2000ppm of Cr^<3+> in the chromate treating solution could be determined continuously by using this analyzer with the standard deviation (σ^^^_d) of 105ppm (Cr^<6+>) and 15ppm (Cr^<3+>) to the values of the chemical analyses. The stability of this analyzer in the running test of 12 hours was 110ppm (Cr^<6+> : 5500ppm) and 17ppm (Cr^<3+> : 750ppm) in R (the difference between max. and min.). This analyzer was freed from the interference with Fe^<3+>, Zn^<2+>, So^2_4^-, No_3^-, CH_3COO^-, suspended sludge, and bubble in the case of Cr^<6+> and Fe^<3+>, Zn^<2+>, So^2_4^-, No_3^-, and CH_3COO^- in the case of Cr^<3+>.
社団法人日本鉄鋼協会の論文
1980-02-01