In the previous article, we explained the specific functions and applications of conformal coating. Next, we will discuss the process specifications and requirements for applying conformal coating step by step.
Firstly, the spray painting requirements are as follows:
1. Spray thickness: The thickness of the coating should be controlled between 0.05mm and 0.15mm. The dry film thickness should be 25um to 40um.
2. Secondary coating: To ensure the thickness for products with high protection requirements, a second coating can be applied after the film has cured (determine whether a secondary coating is needed based on specific requirements).
3. Inspection and repair: Visually inspect whether the coated circuit board meets the quality requirements and repair any issues. For example: if pins and other protected areas are contaminated with conformal coating, use tweezers to hold a cotton ball or clean cotton ball dipped in panel cleaning solution to clean it. Be careful not to wash away the normal coating during the cleaning process.
Additionally, after the coating has cured, if component replacement is necessary, the following operations can be performed:
(1) Directly solder off the old components with an electric soldering iron, then clean the surrounding material of the pad with a cotton cloth dipped in panel cleaning solution;
(2) Solder the new replacement components;
(3) Apply conformal coating to the soldered area with a brush and allow the coating to flash off and cure.
In the next article, we will discuss specific operational requirements.
