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May 10,20251. Processing selection of metal plate powder coated steel and aluminum bending and welding frame parts
Steel: galvanized steel or cold-rolled steel is preferred, with a thickness range of 0.5-4mm, suitable for high-load parts, and structural parts need to be formed through bending process.
Aluminum: 5052, 6061 and other aluminum alloys are commonly used, with a thickness of 0.8-3mm, lightweight and corrosion-resistant, but galvanic corrosion caused by direct contact with steel should be avoided.
Powder coating compatibility: Steel and aluminum need to be pre-treated separately (such as galvanized steel needs phosphating treatment, aluminum needs chromizing treatment) to ensure coating adhesion.
2. Optimization of bending process parameters
Angle and radius: The bending radius of steel needs to be ≥ plate thickness (such as 1mm plate thickness radius ≥ 1mm), and aluminum can be appropriately reduced due to better ductility, but cracking of powder coating needs to be avoided.
Sequence and strength: Multiple bends need to follow the order of "outside first, then inside" to avoid stress concentration. For example, the bending force is controlled at 0.2-0.8MPa, combined with precise control of servo motor to avoid coating damage.
Spraying after bending: Recommended process flow to avoid coating peeling during bending. Flexible powder coating should be used after spraying.
3. Powder coating process
Steel parts: degreasing → phosphating → passivation to enhance the adhesion of the coating (adhesion ≥ 5MPa).
Aluminum parts: degreasing → chromization (such as aluminum gas welding solvent containing KCl/NaF) to improve the corrosion resistance of the oxide film.
Spraying parameters: voltage 60-80kV, powder particle size 15-50μm, film thickness 40-80μm.
Curing process: baking at 135-150℃ for 20-30 minutes to form a cross-linked coating (such as epoxy-polyester mixed system).
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