Degumming refers to the process of removing colloids, organic matter or other contaminants remaining on the surface of a workpiece during electroplating, painting or other surface treatment processes. The purpose of debonding is to ensure that the surface of the workpiece is clean, thereby improving the adhesion and quality of subsequent treatments (such as electroplating, painting, etc.).
Author: Marisa
Degummingn refers to the process of removing colloids, organic matter or other contaminants remaining on the surface of a workpiece during electroplating, painting or other surface treatment processes. The purpose of debonding is to ensure that the surface of the workpiece is clean, thereby improving the adhesion and quality of subsequent treatments (such as electroplating, painting, etc.).
1. The role of degumming
1)Improve adhesion:Remove residual colloids or organic matter on the surface to ensure that subsequent coatings or plating can adhere firmly.
2)Improve surface quality:Clean the surface to avoid defects in the coating or plating (such as bubbles, pinholes, etc.).
3)Extend service life:Improve the corrosion resistance and wear resistance of the coating or plating, and extend the service life of the workpiece.
2. Degumming method
Depending on the workpiece material, colloid type and production conditions, different degumming methods can be selected:
1)Chemical degumming:
Principle: Use chemical solution (such as acidic or alkaline solution) to react with colloid to dissolve or decompose it.
Common solutions: sodium hydroxide (NaOH), sulfuric acid (H₂SO₄), hydrochloric acid (HCl), etc.
Advantages: Suitable for mass production and low cost.
Disadvantages: May corrode some materials.
2)Mechanical degumming:
Principle: Remove surface colloids by mechanical methods (such as brushing, sandblasting, etc.).
Common equipment: brushing machine, sandblasting machine, etc.
Advantages: Suitable for hard colloids or colloids that are difficult to dissolve.
Disadvantages: May damage the workpiece surface.
3)Thermal degumming:
Principle: Soften or decompose the colloid by heating, and then remove it by mechanical methods.
Common equipment: heating furnace, hot air gun, etc.
Advantages: Suitable for thermoplastic colloids.
Disadvantages: high energy consumption, may cause thermal damage to the workpiece.
4)Ultrasonic debonding:
Principle: Utilize the cavitation effect of ultrasound to generate high-frequency vibration to peel the colloid from the workpiece surface.
Common equipment: ultrasonic cleaning machine.
Advantages: suitable for workpieces with complex shapes, good debonding effect.
Disadvantages: high equipment cost and complex maintenance.