What are the characteristics of electrolytic oil removal by electric heating tubes compared to chemical oil removal?

What are the characteristics of electrolytic oil removal by electric heating tubes compared to chemical oil removal?

The precipitation of a large amount of gas on the surface of the electrode will have a strong impact and emulsification effect on the oil film. When a workpiece with an oil film adhered to it is immersed in an alkaline electrolyte, cracks occur in the oil film due to the decrease in interfacial tension between the oil and alkaline solution. At the same time, the electrode polarizes due to electrification. Although electrode polarization does not have much effect on non ionic oils, it greatly reduces the interfacial tension between the metal and alkaline solution, thus quickly increasing the contact area between the two, thereby squeezing out the oil stains attached to the metal surface and further breaking the oil film into small oil droplets. Due to the action of electric current, small bubbles (hydrogen or oxygen) are generated on the electrode, which are easy to stay on the oil droplets. New gas is constantly generated, and the bubbles gradually become larger. Under the influence of bubble lift, the tendency of the oil droplets to leave the metal surface increases. When the lift of the bubble is large enough, it carries the oil droplets off the metal surface and onto the liquid surface.

From this, it can be seen that the electrochemical oil removal process in alkaline solutions is a comprehensive process of electrode polarization and gas mechanical tearing of oil stains.

69. What are the characteristics of electrolytic oil removal compared to chemical oil removal?

Answer: The composition of electrolytic degreasing solution is roughly the same as that of chemical degreasing solution. The speed of electrochemical oil removal is often higher than that of chemical oil removal, resulting in a cleaner removal of oil stains. The alkalinity in the electrochemical oil removal solution can be reduced slightly compared to chemical oil removal, as saponification is not the main action at this time, and there is no need to add emulsifiers. If emulsifiers are used, they will form a large number of foam floating on the solution surface, thus preventing the smooth escape of hydrogen and oxygen. When there is poor electrical contact and ignition occurs, it is easy to cause an explosion accident. To ensure the quality of the electroplating layer, electrochemical degreasing is often used before electroplating the parts into the tank.

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