What is Aluminum Profile Powder Coating surface treatment process
What is powder coating and how is it used on the surface of aluminum profiles. Let’s look at it today in a few steps:
The principle of powder coating process:
With electrostatic powder spraying equipment to powder coating to the surface of the workpiece, under the action of static electricity, the powder will be uniformly adsorbed on the surface of the workpiece to form a powder coating; powder coating after high temperature baking leveling and curing, into the effect of the final coating of the different; spraying effect in terms of mechanical strength, adhesion, corrosion resistance, aging resistance, etc. is better than the spray paint process.
Here are the Aluminum Powder coating video from Hugh Aluminum:
The basic process of powder coating
1. Surface pretreatment:
For sheet metal stamping parts can be used chemical pretreatment method. That is: de-oil → rust → cleaning → phosphating (or purification) and so on. Most of the rust or surface thicker workpiece, using sandblasting, shot blasting and other mechanical methods to remove rust, but mechanical descaling should ensure that the surface of the workpiece is clean and unscaled.
2. Spraying:
The workpiece enters the spray gun position of the powder spraying room through the conveyor chain to prepare for the spraying operation. The electrostatic generator releases high-voltage static electricity (negative pole) to the space in the direction of the workpiece through the electrode needle of the gun nozzle.
The high voltage electrostatic charge ionizes (negatively charges) the mixture of powder and compressed air coming out of the gun and the air around the electrodes.
The workpiece through the hangers through the conveyor link ground (grounding pole), so that the gun and the workpiece to form an electric field between the powder in the electric field force and compressed air pressure under the dual impetus to reach the surface of the workpiece, relying on electrostatic attraction on the surface of the workpiece to form a layer of uniform coating.
3. Baking and curing:
After spraying the workpiece through the conveyor chain into the 180 ~ 200 ℃ baking room heating, and insulation for a corresponding time, (15-20 minutes) so that the melting, leveling, curing, so as to get the workpiece surface effect we want. (Different powders are different in baking temperature and time).
Advantages of powder coating:
- High efficiency and energy saving: due to one-time film formation, it can increase productivity by 30-40% and reduce energy consumption by about 30%.
- Less pollution: no organic solvent volatilization (no harmful gases such as toluene and xylene in paints and coatings).
- Good film performance: one-time film thickness of 50-80μm, aluminum profile adhesion, corrosion resistance and other comprehensive indicators are excellent.
- Diversified colors, can make a variety of colors according to customer requirements, and the chances of color difference is low.
Disadvantages:
- Bright colors are easy to fade.
- The surface of aluminum profiles with poor surface treatment is prone to orange peel, or even powder removal.
Hugh aluminum is an aluminum profile manufacturer, we have the surface treatment processing capability of anodic electrophoresis, anodic oxidation and powder coating. We have modern aluminum extrusion lines. Our aluminum profile surface treatment meets ISO standards to meet your aluminum profile production and surface treatment needs.
