(صورة توضيحية فقط)
Powder coating is a dry finishing process where a لدن بالحرارة أو thermoset polymer powder is applied to a surface, typically electrostatically, and then cured under heat. The powder particles are charged, causing them to adhere to the grounded substrate. Heating melts the powder, allowing it to flow and form a continuous, durable, and high-quality finish, often superior to conventional paint.
The powder coating process involves three main steps: part preparation, powder application, and curing. Proper surface preparation is critical for adhesion and involves cleaning and often pre-treatment like phosphating or chromating. In the application stage, the most common method is electrostatic spray deposition (ESD). A spray gun imparts an electrostatic charge (typically negative) to the powder particles as they exit the nozzle. The object to be coated is electrically grounded, creating an electrostatic field that attracts the charged powder particles to its surface. This attraction is strong enough to hold the powder in place temporarily. The coated part is then moved into a curing oven. The heat melts the powder, causing it to flow together and chemically react to form a cross-linked polymer network. This process, known as curing, results in a hard, durable finish. A key advantage of powder coating is its environmental friendliness, as it emits near-zero volatile organic compounds (VOCs). Furthermore, any oversprayed powder can be collected and reused, making the process highly efficient with material usage rates often exceeding 95%. The resulting coating is generally thicker and more resistant to chipping, scratching, and fading than liquid paint.
Powder Coating Application Process
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الصور والتنزيلات بالحجم الكامل متاحة فقط، ومجانية تمامًا، للأعضاء المسجلين.
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