Why do we have to use pure water for the electrophoresis coating process?
In the electrophoretic coating process, pure water washing is an essential process. The electrophoretic coating production line is inseparable from the use of pure water washing processes. So why do the electrophoretic paint process wash with pure water? The following Hongheshun electrophoretic paint manufacturers will give you an analysis.
If the workpiece brings a lot of impurity ions into the electrophoresis tank, it will have a great impact on the quality of the electrophoretic coating film and the stability of the bath liquid. The electrophoretic paint film will cause various paint film defects, such as paint film pitting. , Granular and so on. However, the advantage of pure water is that it has fewer impurity ions and low conductivity. Then pure water washing can well control the impurity ions to be brought into the electrophoresis bath to improve the quality of the electrophoretic paint film. Therefore, the workpiece must be cleaned with pure water before entering the electrophoresis tank.
The pure water used for electrophoretic coating requires a conductivity of ≤10μs / cm; the conductivity of industrial water is generally about 200μs / cm, so the pure water used in the electrophoresis process has a much higher requirement than ordinary industrial water.
At the same time, if the conductivity in the electrophoresis bath is too high, an ultrafiltration machine is required to discharge the UF solution by ultrafiltration, and then pure water is added to the bath to reduce the content of impurity ions.
Generally, the conductance of dripping water after washing with pure water is controlled below 30 μs / cm. The phosphated product must be washed with tap water and then washed with 2 to 3 passes of pure water before the electrophoretic coating process.
Summarizing the content of the analysis above, it is concluded that high-quality pure water is the basic requirement to ensure the quality of electrophoresis products, so a qualified pure water machine is essential. Choose a good pure water machine and make high-quality products. Hong Heshun pure water machine , you deserve it.