electrostatic test equipment

• Preparation for spraying

  

  Jul 10, 2025

  1. Surface treatment requirements of substrate Before spraying, the surface treatment of the substrate is very important, which directly affects the adhesion and quality of the coating. Common surface treatment methods include: Cleaning: The substrate surface must be clean without oil, dust, rust and other impurities. Impurities can be removed by chemical cleaning or mechanical cleaning (such as sandblasting, grinding). Oil and water will cause the powder coating to adhere firmly. Rusting: Steel and other metal materials are prone to rust in the process of use. Before spraying, rust should be removed by sandblasting, acid washing or electrolysis to ensure that there is no rust and oxide on the surface. Phosphating treatment: Phosphating treatment for steel, aluminum alloy and other materials can effectively improve the corrosion resistance of the substrate surface and enhance the adhesion of the coating. Phosphating film is a uniform and strong coating, which contributes to the stability of powder coating. Preheating: For some materials, such as aluminum alloys, preheating treatment can improve the adhesion of the coating, especially when spraying in high humidity.   2. Control of spraying environment The control of spraying environment has an important impact on coating quality and spraying effect. The main control factors include: Temperature and humidity: The temperature and humidity of the spraying environment should be kept within a certain range. Usually, the temperature is between 18°C and 30°C, and the humidity is controlled below 50%. Too high humidity may lead to powder moisture absorption, which will affect the spraying effect, and even produce bubbles and cracks. Air quality: The spraying area should be kept clean to avoid dust and impurities polluting the coating. The air should not contain too much moisture and oil and gas to avoid the coating peeling off or bubbles after spraying. Ventilation: The spraying area should be kept in good ventilation, so as to discharge the dust in time during the spraying process and ensure the safety of construction personnel.   3.Selection and storage of spray powder Correct selection of appropriate spray powder is the guarantee of spray quality. The selection of powder should be based on the following points: Types of Powder Coatings: Electrostatic powder coatings come in various types, including polyester powder, epoxy powder, and acrylic powder. Different types are suitable for different application scenarios. For instance, polyester powder is ideal for outdoor product coating due to its excellent weather resistance, while epoxy powder excels in indoor applications thanks to superior corrosion resistance. Particle size: The particle size of powder affects the spraying effect and the flow of powder. Generally speaking, the finer the particles, the more uniform the coating will be, but too small particles may cause splashing during the spraying process. Usually, the particle size of spraying powder is between 20-100 microns. Color selection: Select the appropriate powder color according to your needs. Powder coatings are generally available in a variety of colors and effects, such as matte, gloss or metallic effects. Storage requirements: Dry storage: The sprayed powder should be stored in a dry, cool place, avoid moisture, otherwise the powder may absorb moisture, affecting the spraying effect. Sealing storage: because the powder coating is easy to absorb moisture and occur lumping, it must be kept in good packaging, sealed storage, and avoid contact with air. Validity: Each powder coating has a validity period, expired powder may affect the spraying quality, should be used as far as possible within the validity period.         Common problems in the next stage of coating process

  Hot Tags : Preparation for spraying Surface treatment requirements of substrate Control of spraying environment Selection and storage of spray powder protexus electrostatic spraying system Electrostatic spraying equipment electrostatic paint equipment electrostatic test equipment

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