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Electrophoresis process

  • Author:naky
  • Source:www.diecastingpartsupplier.com
  • Release on :2016-06-24
Electrophoresis process is divided into anode and cathode electrophoresis electrophoresis. If the paint particles are negatively charged, the workpiece is the anode, the paint particles under the electrostatic force called the anode type deposition in the workpiece electrophoresis; the other hand, if the positively charged paint particles, the workpiece is the cathode, the coating particles deposited in a film on the workpiece is called cathodic electrodeposition

Anodic electrophoretic characteristics are: raw materials cheap (generally 50% cheaper than the cathode electrophoresis); equipment is relatively simple, low investment (generally 30% cheaper than the cathode electrophoresis); lower technical requirements; cathodic electrodeposition coating corrosion resistance than the difference ( about the life of the cathodic electrodeposition 1/4).
Cause cathodic electrodeposition coating high corrosion resistance are: the workpiece is the cathode, anode dissolution does not occur, and the surface does not destroy the phosphate coating; Electrophoretic coating (typically a nitrogen-containing resin) has a protective effect on the metal, and the paint prices high quality.

Anode electrophoresis general process: pre-work processing (degreasing rust → → → hot water washing in cold water phosphate → hot water washing → passivation) → → anode electrophoresis after work processing (water washing → drying).
1, degreasing. Hot alkaline solution is generally chemical 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, with hydrochloric acid descaling solution, HCl total acidity ≥43 points; free acidity> 41 points; plus 1.5% detergent; wash at room temperature for 10 ~ 20min.
4, cold water. Flow cold water 1min.
5, phosphate. With temperature phosphating (60 ℃ when phosphate 10min), phosphate solution using commercially available products.
The above process can also be used instead of sand → washing.
6, passivated. (Sold by manufacturers phosphating solution) at room temperature 1 ~ 2min phosphate solution can be used with matching drugs.
7, anode electrophoresis. Electrolyte composition: H08-1 black electrophoretic paint solids mass fraction of 9% to 12%, distilled water mass fraction of 88% to 91%. Voltage: (70 ± 10) V; Time: 2 ~ 2.5min; paint liquid temperature: 15 ~ 35 ℃; paint PH value: 8-8.5. Note the work out of the slot to power. During electrophoresis current will gradually decrease with film thickening.
8, wash with water. Flowing cold water wash.
9 drying. In an oven at (165 ± 5) ℃ bake at a temperature of 40 ~ 60min to.