Polishing Method Introduction Of Polished Vetrosa

Electrolytic polishing process How to make the surface of the specimen bright as a mirror, there is no perfect theory, can be said that the electrolysis process of all phenomena. The film theory is considered to be a reasonable hypothesis. The film theory holds that when electrolytic polishing is near the anode surface of the specimen, the electrolyte is formed on the specimen with the surface concave and convex, a layer of thick viscous film is not uniform.Polished Vetrosa

Because of the stirring flow of the electrolyte, the diffusion flow is very fast in the area near the surface of the specimen, and the film is thinner, and the diffusion flow is relatively slow and the film is thicker in the place near the surface of the specimen.Polished Vetrosa The specimen can be polished with this layer of uneven thickness of the film is closely related. The membrane resistance is very big, so the film is very thin place, the current density is very big, the membrane is very thick place, the current density is very small. The current density varies widely in the sample grinding, where the current density is the highest, the metal dissolves rapidly in the electrolyte, and the concave part dissolves slowly.Polished Vetrosa

A to B, the current increases with the increase in voltage, the voltage is relatively low, not enough to form a layer of stable film; even if formed, it quickly dissolves into an electrolytic solution and cannot be electrolytic and polished. Polished Vetrosa

Electrolysis leaching is the only way to use the electrolysis erosion phenomenon. Between B and C, the surface of the specimen forms a film of a reaction product, and the voltage rising current decreases. Between C and D, the voltage rises, the film thickens, the corresponding resistance increases, and the current remains the same. Due to diffusion and electrochemical processes, the polishing is produced. -Between the normal electrolytic polishing range. Between D to E, release oxygen, due to oxygen formation, resulting in the specimen surface pitting. This may be due to the adsorption of bubbles on the surface, resulting in a partial reduction of the thickness of the film.Polished Vetrosa