The pretreatment work of vacuum coating mainly includes the following steps, each of which assumes a specific role to ensure the quality and effect of the coating process:
No.1 Pre-treatment steps
1. Surface grinding and polishing
Use abrasives and polishing agents to mechanically process the surface of the plated parts in order to remove the rough microstructure of the surface and achieve a certain degree of finish.
Function: Improve the adhesion and uniformity of the coating, make the surface of the coating smoother and more beautiful.
2.Degreasing
Adopt solvent dissolution, chemical or electrochemical methods to remove grease and oil on the surface of plated parts.
Function: Prevent oil and grease from producing bubbles, flaking and other defects in the coating process, and improve the adhesion of the coating.
3.Cleaning
Use acid, alkali, solvents and other chemical solution immersion or ultrasonic, plasma cleaning of plated parts to remove surface oxides, rust and other impurities.
Role: to further clean the surface of the plated parts, to ensure that the coating material and the substrate between the close combination.
4.Activation treatment
Erode the surface of plated parts in weak acid or special solution to remove the passivation layer on the surface and improve the activity of the surface.
Role: to promote the chemical reaction or physical combination between coating material and plated surface, to improve the combination and durability of the coating.
No.2 the role of pretreatment
1. Improve the quality of coating
Pre-treatment can ensure that the surface of the plated parts is clean, smooth and free of impurities, which is conducive to the uniform deposition of the coating material and close combination.
This helps to improve the coating adhesion, uniformity and hardness and other performance indicators.
2. Optimize the coating process
The pretreatment process can be adjusted according to the material of the plated parts and the coating requirements to adapt to different coating processes and equipment.
This helps to optimize the coating process parameters and improve the productivity and coating quality.
3. Reduce coating defects
Pretreatment can remove oxides, loose tissue, burrs and other structures on the surface of the plated parts, preventing these structures from becoming a source of defects during the coating process.
This helps to reduce bubbles, flaking, cracks and other defects in the coating process, and improve the aesthetics and usability of the coating.
4. Ensure production safety
The steps of oil degreasing and chemical cleaning in the pretreatment process can remove the flammable and explosive substances and toxic and harmful substances on the surface of the plated parts.
This helps to reduce the risk of fire, explosion or environmental pollution and other safety accidents in the coating process.
In summary, the pretreatment work of vacuum coating includes surface grinding and polishing, oil degreasing, chemical cleaning and activation treatment steps. Each of these steps assumes a specific role to ensure the quality and effectiveness of the coating process. Through pretreatment, the coating quality can be improved, the coating process can be optimized, the coating defects can be reduced and the production safety can be guaranteed.
–This article is released by vacuum coating machine manufacturer Guangdong Zhenhua
Post time: Oct-21-2024