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Electrophoresis

Similar to electroplating, electrophoresis is a metal surface treatment process. It is used to paint various metal parts and can provide corrosion prevention and surface decoration. Generally, the metal substrate is immersed in a solution containing epoxy resin paint, etc., and an electric current is passed to attract the suspended paint particles in the solution, which can be deposited onto the surface of the substrate to form a protective film.

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What is electrophoresis?

Electrophoresis is also known as electrodeposition, electrophoretic paint, and electrodeposition. Founded in the 1960s, it was first applied to automobile primer by Ford Motor Company. Due to its excellent anti-corrosion and anti-rust function, it was soon widely used in the military industry. Only in recent years has it been applied to the surface treatment of daily-use hardware. Due to its excellent quality and high environmental protection, it is gradually replacing traditional paint spraying.

What is the basic principle of electrophoresis?

Electrophoresis is similar to electroplating in that electrophoresis is a metal surface treatment process. Generally, the metal substrate is immersed in a solution containing epoxy resin paint, etc. The electrophoretic coating is applied at the cathode and anode, and an electric current is passed to attract the suspended paint particles in the solution. When voltage is applied, the charged paint ions move to the cathode and form an insoluble substance with the alkaline material produced on the cathode surface, which is then deposited onto the surface of the substrate to form a protective film. The thickness of the film is controlled by the current and time, the higher the current and the longer the time, the thicker the protective film. Electrophoresis has the advantages of corrosion resistance and strong adhesion, and the production process basically does not produce harmful gases. It can also be automated to precisely control the amount of adhesion applied to the metal substrate, so it is widely used.

What is the difference between electrophoresis and electroplating?

The main difference is that electroplating uses electrolysis to coat the surface of a metal substrate with a thin layer of another metal or alloy. Electrophoresis, on the other hand, is a technique that uses charged particles, which move at different speeds in an electric field, to achieve separation.

Types of electrophoresis:

There are two kinds of electrophoresis, anodic electrophoresis and cathodic electrophoresis. Anodic electrophoresis is the first developed electrophoresis process, that is, the workpiece is electrified with positive electricity to attract negatively charged paint particles; while cathodic electrophoresis, on the contrary, the workpiece is electrified with negative electricity to absorb positively charged paint particles, which greatly reduces the impurities of the cured film and enhances the corrosion resistance and adhesion of the electrophoretic layer, so it is more widely used.

Uses of electrophoresis:

It can make the product present various colors and keep the metallic luster, and enhance the surface performance with better anti-corrosion performance.

Electrophoresis process:

Pretreatment > Electrophoresis > Drying

Electrophoretic properties:

  • Salt water spray (corrosion and rust resistance) test one for more than 800 hours.
  • Acid resistance test a 48 hours or more.
  • Film hardness 2-4H; film thickness 12-22um.
  • Impact resistance 1/2*500g*300cm.
  • 100% density of adhesion.
  • Effective anti-fingerprint effect.

Electrophoresis advantages:

  • Good value for money and cheap.
  • No dead space and full coverage.
  • Good rust prevention.
  • Environmental protection.
  • Many colors, the effect is acquainted with spraying.
  • No metallic texture, can match with sandblasting, polishing, brushing, etc.

Applicable materials for electrophoresis:

Stainless steel, aluminum alloy, zinc alloy.

Cost of electrophoresis:

Black is the cheapest and has the most products doing black electrophoresis, with a slightly higher unit cost than anodizing.

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