What happens if the electrostatic powder spraying current is too high?
What happens if the electrostatic powder spraying current is too high?
If the electrostatic powder spraying current is too high, several issues can occur, including:
1. **Back Ionization** – Excessive charge buildup on the powder particles can cause repulsion and lead to uneven coating, resulting in an orange peel texture or pinholes.
2. **Overcharging Effect** – Highly charged particles may repel each other, preventing them from properly adhering to the surface, leading to poor coating efficiency and thin or inconsistent layers.
3. **Faraday Cage Effect** – High current can make it difficult for powder to reach recessed or intricate areas due to excessive repulsion, causing uneven coverage, especially in complex geometries.
4. **Excessive Powder Waste** – Overcharged particles may not adhere well to the substrate, leading to increased overspray and wasted powder.
5. **Poor Adhesion & Durability** – If the powder is overly charged, it may not properly anchor to the surface, resulting in poor adhesion and reduced coating durability.
To avoid these issues, it’s important to adjust the electrostatic voltage and current properly, typically keeping them within the recommended range for the specific powder and application.
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