Electrolytic degreasing is an effective surface treatment process that is widely used in metal processing and preparation before electroplating. Its purpose is to remove grease, dirt and other impurities from the metal surface to ensure smooth subsequent treatment.
Author: Anna
Electrolytic degreasing is an effective surface treatment process that is widely used in metal processing and preparation before electroplating with suspension sets. Its purpose is to remove grease, dirt and other impurities from the metal surface to ensure smooth subsequent treatment.
The following is the basic process flow of electrodeleasing.
Solution preparation: The temperature of the electrode release oil solution is generally controlled at 60~80℃, and the concentration of the solution is usually 50~80g/L.
Process steps: cathodic degreasing: firstly, the metal parts to be treated are used as cathode, energized for 3~7 minutes to carry out the reduction reaction, precipitate hydrogen gas and reduce the adhesion between oil film and metal.
Anodic degreasing: Subsequently, the parts are used as anode and energized for 0.5~2 minutes to carry out oxidation reaction, precipitating oxygen and further reducing the adhesion of the oil film.
Stirring and emulsification: In the process of electrolysis, the precipitated hydrogen and oxygen play the role of emulsification in the solution, and the bubbles are adsorbed on the surface of the oil film, which will be torn into small oil droplets and brought to the liquid surface, accelerating the speed of oil removal.
Cleaning: After the electrolysis is completed, the next step can be carried out directly, such as acid pickling and rust removal, without water washing, but under the condition of a hot water wash to improve the effect.
Parameter control: The current density should be controlled at 3~10A/dm², and the uniformity of spraying is also important to ensure that each part can be evenly cleaned.
Note: In the whole pre-treatment process, the parameters and operation of each link should be strictly controlled to ensure that the surface cleanliness of the parts meets the requirements.
Electrolytic degreasing not only has the saponification and emulsification effect of chemical degreasing, but also further enhances the degreasing effect through electrochemical action to ensure the cleanliness of the surface of the metal parts, and provide a good foundation for the subsequent plating or other surface treatment.