Optimization of using NaOH in industrial cleaning systems

الملخص EN

For preparing a metal specimen surface the type of the solution needed for such purpose is the most important, so the typical conditions for the behavior of steel in sodium hydroxide solution were selected due to the wide utility of such metal in such environment especially in degreasing or cleaning steps preceded many electrochemical or chemical processes.

Behavior of steel in 10, 25 and 50 g / l of NaOH solution for intervals of 30, 60 and 90 minute at 80 0C were analyzed by weight loss and polarization method.

It was stated according to statistical study (ANOVA) or (F-Test) that the weight loss change at constant concentration with varying time has little effect.

Also with concentration variation at fixed time but their effect together has a sound appearance.

By using the said statistica an empirical relation was obtained which interrelates the weight change with concentration and time, from which the optimum concentration of NaOH was appointed.