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Synopsis: The fundamental approaches for an automatic concentration control system were made of five kinds of chemical treatment baths in an electric galvanizing process. The results obtained are summarized as follows: (1) The concentration of NaOH or Na4SiO4 in an alkali-using cleaning bath and H2SO4 in a pickling bath can be analized with electric conductivity cell. (2) The concentration of ZnSO4 • 7H2O and H2SO4 in an electric galvanizing bath can be automatically analyzed with the combination of specific gravity meter and pH meter. (3) The concentration of (NH4)2CO3 in an electolytic cleaning bath can be automatically analyzed with electric conductivity cell and those of CrO3 and its addition in an electrolytic chromate bath can be done with the combination of electric conductivity cell and specific gravity meter.

Development of On-Line Analysis System for Components in Plating Bath and Some Chemical Treatment Baths of Electric Galvanizing Process