ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
On-line Analyzer for Ni–An Alloy Electroplating Bath
Yoshiro MatsumotoNobukatsu FujinoAtsuyoshi ShibuyaHideyoku NakaharaIkuo NakaseAkihiro Koizumi
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1989 Volume 29 Issue 10 Pages 887-893


In the production of Ni–Zn alloy electroplated steel sheets, the concentrations of Ni2+ and Zn2+ ions in the plating bath are necessary to be controlled. An automatic on-line analyzer has been developed for the process control. The on-line analysis system consists of a sampling system and an energy-dispersive X-ray fluorescence analyzer. The plating process solution is continuously supplied to the X-ray fluorescence analyzer through the sampling system form the plating trays. The concentrations of the Ni2+ and Zn2+ ions are determined from the intensities of Ni, Zn, Fe and S fluorescent lines. The intensities of the S and Fe lines are measured for interelement correction. The intensity of the S line is easily measured after a path in air with the energy-dispersive X-ray spectrometer. The S line is excited by chromium, and the Ni, Zn and Fe lines are by tungsten X-ray source, for obtaining a higher excitation efficiency. The analysis can be completed within 8 min. The analytical accuracies on the production line were 0.77 g/l for Ni2+ and 0.48 g/l for Zn2+ ion.

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© The Iron and Steel Institute of Japan
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