Degreasing method for electroplating organic solvent
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September 28 06:15:21, 2025
In electroplating production lines, proper degreasing of the workpiece is essential before plating. Today, we'll explore the organic solvent degreasing method and how it can be effectively applied in different scenarios.
(1) **Immersion Method**
The immersion method involves submerging the metal part into a cleaning bath filled with an organic solvent. This allows the entire surface to come into contact with the solvent, which dissolves oils and removes insoluble dirt. To enhance efficiency, the process can be accelerated by heating the solvent or increasing the immersion time. A higher flow rate of the solvent or mechanical assistance such as brushing or squeegeeing can also improve the results. Various organic solvents can be used depending on the material and type of grease.
(2) **Spray Method**
In the spray method, a water pump forces the organic solvent through nozzles onto the metal surface. The solvent continuously dissolves grease and carries away contaminants. The spraying is repeated until all oil is removed. Typical pressure ranges between 70 to 120 kPa, with higher pressure increasing the mechanical action of the solvent. High-pressure jets are especially effective at removing particulate matter like dust, carbon, and sand. While volatile solvents like gasoline, alcohol, and methylene chloride are commonly used, other solvents must be handled in closed systems for safety.
(3) **Vapor Method**
The vapor method uses heated organic solvent to create a vapor phase. The workpiece is placed in this vapor zone, where the grease is dissolved by the solvent vapors. As the vapor condenses on the surface, it drips back into the cleaning solution below. The solvent is then reheated and re-vaporized, creating a continuous cycle. This ensures that the vapor contacting the workpiece is always clean, reducing contamination and achieving high surface cleanliness. The ideal solvent for this method should have good oil-dissolving ability, low heat of vaporization, a suitable boiling point, and a density greater than air to minimize evaporation loss.
(4) **Combined Treatment Method**
For complex parts with deep holes or stubborn grease, a combined approach is often used. This includes immersion, vapor, and spray methods. For example, in steam-immersion degreasing, the workpiece is first immersed in a solvent to remove heavy deposits, then sprayed, and finally treated with vapor. This multi-step process ensures thorough cleaning and is ideal for mass production and difficult-to-clean surfaces.
Other combinations, such as injection-vapor or steam-immersion-injection, can further enhance the cleaning effect. These methods require careful setup and maintenance but offer superior results, especially for heavily soiled or intricate components.
Overall, the choice of degreasing method depends on the type of workpiece, level of contamination, and production requirements. Using the right organic solvent and technique ensures optimal preparation for electroplating, leading to better coating quality and long-term performance.