Methods of measuring and controlling activity of zinc phosphate treatment solution

摘要

A prescribed amount of a simple fluoride is added to a zinc phosphate treatment solution, which is a target solution, the HF concentration in the target solution is measured with a silicon electrode meter after the addition, and the concentration of the consumed HF is calculated to evaluate the activity of the target solution, for adding the simple fluoride to the zinc phosphate treatment solution so that its activity is in a control reference range.