SURFACE FINISHING
Powder coating
Surface finishing with powder coatings includes electrostatically depositing dry powder thermally cured.
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Introduction
Powder coating is the electrostatically applied of dry powder to the surface. It produces a thin layer providing excellent resistance to wear, corrosion, and abrasion.
Surface finishing with powder coatings includes electrostatically depositing dry powder thermally cured. Powder coating offers a durable surface and is suitable for metal parts made of Steel and aluminum. Their alloys are coated with powder—particularly those used in Vehicle & household appliances. The powder coating creates a strong layer resistant to wear, corrosion, and abrasion.
key properties
| Features | Info |
|---|---|
| Materials | Aluminum, Stainless Steel, Steel |
| Color | Black (20% or 90% gloss), white (20% or 90% gloss) |
| Texture | Gloss or semi-gloss |
| Thickness | 60μm to 100μm |
Powder coating’s advantages over traditional liquid coating methods
| High durability: Powder coating is a very durable and long-lasting coating that can withstand high temperatures, chemicals, and UV exposure. |
| High efficiency: Powder coating can be applied quickly and easily and it does not require solvents. |
| High versatility: Powder coating can be used on a wide range of materials, including metals, plastics, and composites. |
| High environmental friendliness: Powder coating does not produce hazardous pollutants during the application process. |
Steps of powder coating:
| Surface preparation: The surface to be coated must be cleaned and prepared to ensure the adhesion of the coating. |
| Application: The powder is electrostatically charged and sprayed onto the surface, where it is then fused into a smooth, even coating. |
| Curing: The coated surface is then heated in an oven to cure the coating, which can take anywhere from a few minutes to an hour, depending on the specific powder used and the thickness of the coating. |
| Inspection: The coating is inspected for any defects, such as bubbles, sags, or holidays (missed spots) |
It is important to note that powder coating can also be applied in a fluidized bed process, where the parts are dipped into a fluidized powder and then cured.
Powder coating is widely used in various industries such as automotive, architectural, appliances, furniture, general manufacturing, and many more.
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Define substrate preparation, film data and fit protection
Powder coating requirements should identify substrate preparation, color/gloss reference, film thickness or performance criteria, cure constraints, masking and the way tight fits, threads, ground points or sealing surfaces are protected.
Engineering data to lock before release
| Preparation | Substrate cleaning and pretreatment requirement |
|---|---|
| Coating target | Color, gloss, texture and film-performance requirement |
| Geometry protection | Threads, bores, electrical grounds and sealing faces |
| Verification | Film measurement, visual standard and adhesion/performance test |
Masking and dimensional build-up should be resolved in the drawing before coating, not corrected during assembly.
