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Conformal coating is a protective, breathable coating of thin polymeric film applied to printed circuit boards (PCBs). Conformal coatings are typically applied with 25–250 μm [ 1 ] thickness on electronic circuitry to protect against moisture and other substances.
Conformal coating gives most of the benefits of potting, and is lighter and easier to inspect, test, and repair. Conformal coatings can be applied as liquid or condensed from a vapor phase. When potting a circuit board that uses surface-mount technology , low glass transition temperature (T g ) potting compounds such as polyurethane or silicone ...
While parylene coatings are mostly used to protect an object from water and other chemicals, some applications require a coating that can bind to adhesives or other coated parts, or immobilize various molecules such as dyes, catalysts, or enzymes. These "reactive" parylene coatings can be obtained with chemically active substituents.
Organic solderability preservative or OSP is a method for coating of printed circuit boards. It uses a water-based organic compound that selectively bonds to copper and protects the copper until soldering. Compared to the traditional HASL process, the OSP process is widely used in the electronics manufacturing industry because it does not ...
Chameleon coating; Chemical vapor deposition; Chromate conversion coating; Chromium nitride; Cold spraying; Combustion chemical vapor deposition; Conformal coating; Conversion coating; Curtain coating
A conversion coating is a chemical or electro-chemical treatment applied to manufactured parts that superficially converts the material into a thin adhering coating of an insoluble compound. These coatings are commonly applied to protect the part against corrosion , to improve the adherence of other coatings, for lubrication , or for aesthetic ...
When a paint coating is applied on a metallic surface contaminated with soluble salts, an osmotic blistering process takes place (Figure 8.10). Osmosis is the spontaneous net movement of solvent molecules (water) through a semipermeable membrane (coating film) into a region of higher solute concentration (the salt contaminated substrate).
The final, end use temperature of a coated component should be kept below the temperature at which a PVC DLC coating is applied. A new interface design between DLC-coated silicon wafer and metal is reported to increase the durability of DLC-coated silicon wafer against high contact stress from approximately 1.0 GPa to beyond 2.5 GPa.