The pre-treatment of the surface quite often does not receive enough attention, even though it is the main pre-condition for achieving high-quality powder coating which lasts for a long time. A well-prepared surface ensures optimal adhesion of powder coating on the respective coating surface and improves anti-corrosion characteristics.
Arco Color Latvija applies the new generation eco-friendly Oxsilan technology.
Metal parts undergo a five-stage pre-treatment process that ensures a complete degreasing of the surfaces:
Stage 1: Cleaning (temperature 55°C), 90x2 seconds;
Stage 2: Rinsing with tap water, 45 seconds;
Stage 3: Rinsing with DEMI water, 45 seconds;
Stage 4: Oxsilan, 90 seconds;
Stage 5: DEMI water rinsing, 90 seconds.
All parts are dried at max. 120°C temperature before powder coating.
Powder coating is based on the principle that objects with opposite electrical charge (positive and negative) attracts each other.
Powder particles are negatively charged passing through a special coating gun, which develops a static field around the gun and the grounded part. The static electricity ensures that the powder particles are drawn to the surface of the metal part creating a smooth layer. Finally, the metal part is heated in a polymerization oven, where an even decorative and protective coating is created at 160°C to 200°C temperature.
Most of the conductive materials and thermally stable materials are suitable for powder coating.
Choosing powder coating
3 pre-conditions for choosing the type of powder coating:
- Conditions for usage: indoors or outdoors;
- Surface finish: matt, satin, gloss;
- Coating: smooth or with texture.