Specifications and requirements for conformal coating technology
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: Specifications and requirements for anti-corrosion coating process 1. Painting requirements: 1. Paint thickness: the paint film thickness is controlled at 0.05mm-0.15mm. Dry film thickness 25um-40um 2. Secondary coating: To ensure the thickness of products with high protection requirements, secondary coating can be carried out after the paint film is cured (determine whether to carry out secondary coating based on demand) 3. Inspection and repair: Visually inspect whether the coated circuit board meets the quality requirements, and repair any problems. For example, if the pins and other protected areas are stained with conformal paint, you can use tweezers to hold a cotton ball or a clean cotton ball dipped in board washing water to clean it. Be careful not to wash off the normal paint film when scrubbing. 4. Component replacement: After the paint film is cured, if you need to replace the component, you can follow the following steps (1) Use an electric chrome iron to directly solder the component, and then use a cotton cloth dipped in board washing water to clean the material around the pad （2）Solder the replacement components （3）Use a brush dipped in three-proof paint to apply to the welding part and allow the paint film to dry and solidify II. Operation requirements: [p=null, 0, 1. The workspace of conformal coating should be clean and dust-free, with no dust flying. Good ventilation measures must be taken, and no unauthorized personnel are allowed to enter. 2. When operating, you should wear protective equipment such as masks or gas masks, rubber gloves, and chemical protective glasses to avoid physical harm. 3. After work, clean the used tools in time, and seal and cover the containers containing conformal coating tightly. 0, left]4. Anti-static measures should be taken for circuit boards. Circuit boards should not be placed overlappingly. During the coating process, the circuit boards should be placed horizontally. III. Quality requirements: 1. There should be no paint flow or dripping on the surface of the circuit board. When applying paint with a brush, be careful not to drip onto the locally isolated parts. 2. The conformal coating should be smooth, bright, and uniform in thickness, and the pads, SMD components, or conductor surfaces should be well protected. 3. The paint surface and components should not have defects and foreign matter such as bubbles, pinholes, ripples, shrinkage holes, dust, etc., and should not be powdered or peeled. Note: Do not touch the paint film at will before it is dry. 4. Conformal coating should not be applied to partially isolated components or areas. [p=null, 0,5. Parts and devices that cannot be coated with conformal coating: [color] [rgb(62, 62, 62)] (1) Conventional devices that cannot be coated: high-power heat sinks, heat sinks, power resistors, high-power diodes, cement resistors, DIP switches, potentiometers (adjustable resistors), buzzers, battery holders, fuse holders, IC holders, touch switches, relays and other types of sockets, pin headers, terminal blocks and DB9, plug-in or SMD light-emitting diodes (non-indicating function), digital tubes, grounding screw holes [color] [rgb(62, 62, 62)] BlinkMacSystemFont, "](2) Parts and components that cannot be coated with conformal coating as specified in the drawings (3) Components that cannot be coated with conformal coating as specified in the "Catalogue of Components (Areas) Not Conformal Coating Available" 6. If the conventional components that cannot be coated as specified in the regulations need to be coated, the R&D department can specify the requirements or the drawings to apply conformal coating.
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