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Electrophoresis process

  • Author:Nancy
  • Source:www.diecastingpartsupplier.com
  • Release on:2014-11-21
Anodic electrophoretic characteristics are: cheap raw material (typically 50% cheaper than the cathodic electrodeposition ) ; equipment is relatively simple, low investment (typically 30% cheaper than the cathode electrophoresis) ; low technical requirements; cathodic electrodeposition coating corrosion performance than the difference ( about the life of cathodic electrophoretic 1/4) .

The reason cathodic electrodeposition coating with high corrosion resistance are: the workpiece is the cathode , anode dissolution does not occur, the surface and the phosphate coating is not destroyed; electrophoretic coating (usually nitrogen-containing resin) has a protective effect on the metal and the paint prices high quality . Anodic electrophoretic process in general process: the workpiece before treatment ( degreasing rust → → → hot water cold water hot water phosphate → → passivation ) → after anodic electrophoretic → workpiece processing ( water wash → drying ) .

1 , degreasing . Hot alkaline chemical solution is usually in addition to oil , the temperature is 60 ℃ ( steam heating) , time is about 20min.
2 , hot water . Temperature 60 ℃ ( steam heating ) , the time 2min.
3 , rust . With H2SO4 or HCl, for example rust solution with hydrochloric acid , HCl total acidity ≥43 points; free acidity > 41 points; plus detergent 1.5% ; wash at room temperature for 10 ~ 20min.
4 , cold water . Cold water flow in 1min.
5 , phosphate . Phosphide with temperature (60 ℃ when phosphate 10min), phosphate solution commercially available products.
The above process can also be used instead of blasting → ​​washing .
6 , passivated. (Provided by the sale of phosphate solution manufacturers) , at room temperature 1 ~ 2min phosphate solution can be used with matching drugs.

7 , the anode electrophoresis. Bath composition : H08-1 black electrophoretic paint solids mass fraction of 9% to 12%, mass fraction of 88% distilled water to 91 %. Voltage : (70 ± 10) V; Time : 2 ~ 2.5min; paint liquid temperature : 15 ~ 35 ℃; paint liquid PH: 8-8.5 . Note artifacts out of the groove to be de-energized. During electrophoresis current will gradually decrease with the film thickening.
8 , water wash. Flowing cold water wash.
9 , drying. In an oven at (165 ± 5) baking at a temperature of 40 ~ 60min to ℃ .