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Operation Procedure for Applying Three-Proof Coating
Release time:
2025-12-16 02:19
As an efficient protective coating material, conformal coating is widely used in the manufacturing and maintenance of electronic products. Its primary functions include providing moisture resistance, dust protection, mold prevention, and electrical insulation, thereby ensuring the stable operation of electronic devices under complex and ever-changing environmental conditions. This article will elaborate in detail on the operational guidelines for three major methods of applying conformal coating—spraying, dip-coating, and brush-coating—aiming to provide practical guidance for field operations.
I. Spray Coating Process Specifications
The spray coating method leverages the atomization principle to achieve uniform coating coverage, making it suitable for both mass production and localized coating applications.
Key points of the assignment process:
1. Equipment Inspection and Debugging: Verify that the spray gun’s atomization condition, paint supply pressure, and ventilation system are operating normally to ensure uniform spraying.
2. Workpiece Pre-treatment: Employ a cleaning process to remove surface oil, oxide layers, and other contaminants, followed by thorough drying. Use specialized masking materials to protect areas that do not require coating.
3. Spraying operations:
(1) Automatic spraying: Suitable for continuous production, the spraying path, moving speed, and paint output should be set reasonably to ensure uniform coating.
(2) Manual Spraying: Suitable for small-batch production or repair applications, this method requires careful control of the spray gun’s distance, movement speed, and overlap rate to prevent uneven coating or sagging.
(3) Curing and Inspection: Perform staged curing according to process requirements, controlling temperature and time. After curing, inspect the surface for flatness and ensure complete coverage, and conduct performance tests such as insulation and adhesion.
II. Dipping Coating Process Specifications
The dip-coating method achieves full surface coverage by immersing the workpiece entirely, making it particularly suitable for printed circuit boards with complex structures and three-dimensional assembly features.
Key points of the assignment process:
1. Preparatory Work: Thoroughly clean the surface of the workpiece, ensuring it is free of dust and oil. Adjust the viscosity of the coating according to process requirements and pour it into a clean dipping tank. Protect non-coated areas with masking materials.
2. Dip-coating operation: The workpiece should be immersed into the coating liquid at a steady speed to ensure thorough wetting of all areas. When lifting the workpiece out of the liquid, control both the speed and angle carefully so that any excess coating can naturally level and drip off.
3. Drying and Curing: After draining, allow the coating to dry naturally or heat it according to the curing curve, taking care to avoid bubbles, paint buildup, or uneven thickness in the coating.
4. Quality Inspection: Check whether the coating is complete and uniform, and whether there are any defects such as missing coats or buildup. Make repairs if necessary.
III. Brush-Coating Process Specifications
The brush-coating method, characterized by its flexible operation and simple tools, is often used for small-batch production, rework, or localized touch-ups.
Key points of the assignment process:
1. Surface Treatment: Remove dust, moisture, and other contaminants from the workpiece surface to ensure that the substrate is dry and clean.
2. Paint Mixing: Dilute the paint to the appropriate application viscosity according to the specified ratio, and stir thoroughly until uniform.
3. Brush Coating: Use an appropriate brush and apply the coating evenly in one direction, controlling the coating thickness to minimize brush marks and bubbles. For detailed areas, you can perform precise spot coatings.
4. Curing and Finishing: Select ambient-curing or heat-curing based on the type of coating. After curing, inspect the coating’s appearance and performance. If any defects are found, perform localized repairs.
IV. Conclusion
Spraying, dip coating, and brush coating are commonly used methods in the application of electronic protective coatings, each suited to different production scales, product structures, and process requirements. In practical operations, the appropriate method should be selected based on specific circumstances, and operational guidelines must be strictly followed to ensure consistent coating quality and reliable performance, thereby effectively enhancing the environmental adaptability and service life of electronic products.
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