Surfactant is one of the important raw materials in the field of metal surface treatment, and also one of the indispensable components of most electroplating additives.In the whole process of electroplating, such as chemical degreasing before plating, pickling rust removal, electrolytic degreasing, matrix activation to electroplating single metal, alloy electroplating additives, anti-coating discoloration agent after plating treatment, coating protective film and electroplating wastewater treatment, almost all have to use it.The wide range of applications is due to the special chemical structure of surfactants and hence the special properties.

  ① The addition of surfactant reduces the surface tension of electroplating solution and makes the hydrogen evolution process accompanying the cathodic electrodeposition easier.The coating is prevented from producing dents, pitting and pinholes, so that the coating and matrix bonding force is good.

  (2) The surfactant aqueous solution is adsorbed on the solid surface stained with oil, so that the solid surface of oil wetting, infiltration, emulsification, dispersion, so as to remove oil.

  (3) Surfactants with hydrophilic and hydrophobic base, hydrophobic base in the electrode interface directional adsorption formed double electric layer, often improve the electrode reaction over potential, increase the polarization of the electrodeposition process.The coating crystallization refinement, some change the coating internal stress, hardness, ductility and other mechanical and physical properties.

  ④ The directional adsorption of surfactants on the gas/liquid interface forms a dense liquid film on the surface, and the foaming action of some surfactants forms a foam layer, which prevents the acid mist from escaping.

  The solubilizing and dispersing properties of surfactants help some water-insoluble main brightener molecules to disperse in solution, and the synergistic effect between them can obtain bright and smooth coatings.

  Make some cationic surfactant solution of solid particles with a positive charge, and in the form a layer of protective film on the surface of particles, reduce the surface tension of solid particles, effectively prevent the solid particles in solution can stay and make solid particles dispersed evenly in the solution, and with the electrodeposition of metals Mosaic evenly in the coating, the purpose of implementation of composite plating, The coating is endowed with special functional applications.

  Chemical degreasing:

  The principle of chemical degreasing is to make the grease detach from the surface of the workpiece and become a soluble substance or be emulsified, evenly and stably dispersed in the tank liquid through the saponification, solubilization, wetting, dispersion and emulsification of all kinds of grease by degreasing agent.