Introduction of Electrolytic Polishing Process
Electropolishing electrolyte is usually based on phosphoric acid as the main component and also requires the addition of certain oxidants (e.g. sulfuric acid chromic anhydride etc.) and the electrolyte should have no power and no significant corrosion of the polishing metal in.
Electropolishing electrolyte is usually based on phosphoric acid as the main component and also requires the addition of certain oxidants (e.g. sulfuric acid chromic anhydride etc.) and the electrolyte should have no power and no significant corrosion of the polishing metal in. It also requires the solubility of dissolved products in electrolyte dissolution anode, easy removal, stability of electrolyte, low cost and low toxicity. A small amount of organic substances, such as glycerol and methylcellulose, are added to the electrolyte solution as corrosion inhibitors. Acetic acid electrolyte can be used to obtain electrolyte polishing to obtain a highly optical surface, but this electrolyte is unstable, explosive and inconvenient to use. This electrolyte is mainly used to prepare metallographic grinding.
The duration of electrolytic polishing has a lot of polishing quality. Over a period of time, the leveling speed is very high, then gradually slows down, and even damage to the surface has occurred. With the increase of current density and temperature, the electrolytic polishing time should be shortened. In order to obtain a surface with high finish, it is usually used to repeat polishing methods, and each polishing time should not be too long. Electropolishing aluminum and its alloys earlier in the preparation of phosphate sulfuric acid solution, high purity and polishing effect is better.
In order to prolong the use of electrolytes and to prolong phosphoric acid in the electrolytic polishing of carbon steel, the initial throwing of phosphoric acid-sulfuric acid-chromic anhydride in the solution is carried out first, and then the phosphoric acid-chromic anhydride electrolyte is used. If the larger current is destroyed, it can be carried out in a similar solution to electrolytically polish the surface finish to nickel, copper, etc.
The above is the introduction of electrolytic polishing process knowledge, hoping to help everyone.