Anolyte Systems

Anolyte Systems

The method of electrophoretic painting is one of the most progressive technologies of surface finishing of metal products. The development of the cataphoretic technology is led by the automotive industry since all car producers have focused on corrosion resistance of bodies and other components. High quality of surface finishing, together with favourable economic and ecological conditions, predetermined this technology for use also in other branches of mechanical engineering and consumer Industry.

Cataphoresis is a method of paint application in an electrochemical way. The painted object is connected as a cathode in a direct current field of the electrolyte (water solution of paint) and cations of paint are deposited on it. Electrophoretic cell with the ion-exchange membrane (desk or tubular) is connected as an anode and serves both as a counter-electrode and for maintaining a concentration balance in the paint bath.

In electro-dialysis, the presence of Cl and O2 ions can produce an extremely rapid intragranular corrosion of the steel electrode.Therefor it is nessesery the flush the Electrode continuously with Anolyte. Another point is the cooling of the electrode.Conductivity measurement instruments make it possible to check on the level of acidic ions produced by the electro-dialysis process.Flow meters are needed for each individual ED Cell to make sure that the flow is adjusted acording to Ampere density.A conductivity meter placed in the anolyte circuit does maintaining the conductivity setpoint values ​​specified by the paint manufacturer. This controls an electric valve adding demineralized water (DI) and regulates the acid concentration at the setpoint values. The recommended conductivity varies according to the types of paint and the manufacturers between 600 and 6000 µS / cm. During the process, negatively charged acidic anions are formed and migrate from the cathode to the anode. These molecules pass through the membrane toward the electrode and are trapped in the ED Cell (membrane / electrode interface) where they form an acid molecule with H + according to the dissociation reaction of the paint.
Heydkamp Membrane Technology can provide the complete equipment to make sure that your process is save and effective.