Keywords: Polyvinyl alcohol, quenching fluid, quenching, alkali, cooling, quenching tank, workpiece, cleaning,

Prevent gel of quenching fluid
     Polyvinyl alcohol-based organic polymers in quenching solution will gel when encountering inorganic salts such as salt and alkali, which will change the cooling performance. Therefore, salt and alkali should be avoided as much as possible during the use of quenching tank . If the workpiece cleaning with human lye will gradually increase the pH value. Therefore, the quenching fluid is managed by measuring the pH value to prevent the gel failure of the quenching fluid. The most suitable range of pH 6.5~7.5 is determined by precision test paper in the range of pH 5~9.

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