Guide for the Finish of Aluminium Extrusion Profile

What is aluminium extrusion profile?

Aluminium extrusion profile is the aluminium alloy material which is produced by heating and melting the aluminium, then extrude it to different cross section, and the main composition is the aluminium. The mechanical properties and the application area will be different if the ratio of added aluminium is different. So does the finish of aluminium extrusion profile. Three main surface finishes of aluminium extrusion profile are anodizing, electrophoresis and powder coating. 

Manufacturing process of aluminium extrusion profile

Why choose Aluminium Extrusion Profile?

Corrosion Resistance

The density of aluminium extrusion profile is about 2.7g/cm3 , which is about  of steel, copper or brass, which density are 7.83g/cm3 and 8.93g/cm3. Aluminium can perform great corrosion resistance in most occasion, such as air, water, salt water, oil and other chemicals.

Electrical conductivity Rate

The aluminium extrusion profile is widely used due to its great electrical conductivity. The electrical conductivity rate of aluminium is near 1/2 of copper when their weight are same.

Heat Conductivity Rate

The heat conductivity rate of aluminium alloy is about 50-60% of copper, which is good for the manufacturing of  heat exchangers, evaporators, heating appliances, cooking utensils, and car cylinder heads and radiators.

Non-magnetic

The aluminium extrusion profile is non-magnetic, which is very import to the electrical industry and electronic industry.

Non-Pyrophoric

The aluminium extrusion profile is not pyrophoric, which is very important to the application which is relevant to loading and unloading or touching inflammable and explosive material.

Machinable

The machining property of aluminium extrusion profile is fantastic. The change of machining property is huge in many other wrought aluminium alloy and casting aluminium alloy, as well as the condition after these alloy are produced. Thus, the special machine tool or technology is required.

Formability

The change of permitted deformation quantity is controlled by the special properties of aluminium extrusion profile, such as tensile strength, yield strength, ductility and related machining harden rate.

Recyclable

Aluminium has high recycle property. The property of recycling aluminium is almost same with the primary aluminium.

Type of Aluminium Extrusion Profile

What surface finish we can choose for aluminium extrusion profile?

1.Anodizing: Anodizing is the process which make the aluminium as the anode and put it in the electrolyte solution,  and emerge a dense oxidation film on the surface of aluminium extrusion profile through the effect of electrolyte.

Anodized aluminium extrusion profiles

2.Electrophoresis coating: Electrophoresis coating is the process which make the electrophoresis coating material dissolved in water, and make it electrolyzed and produce charged particles, the charged particle will move to anti-pole and deposit on the aluminium extrusion profile under the effect of external electric field, and emerge a dense and even film.

Electrophoresis Coated Aluminium Extrusions

3.Powder Coating: Electrostatic powder coating is the process which put the powder coating material in the spraying gun and make the powder particle adhesive to the surface of aluminium extrusion profile through high voltage static under the effect of compressed air.

Powder Coated Aluminium Extrusion profiles

Why choose these three surface finishes for aluminium extrusion profile?

1. Anodizing: The anodizing finish will emerge multi-hole oxidation film, which hardness can reach 500HV. The corrosion resistance and wear resistance of material surface can be improved as the multi-hole oxidation film can adhesive lubricant and dyestuff. The oxidation film has great insulation, which breakdown voltage is higher than 30V/ mm. Oxidation film has great resistance on high temperature, which can resist high temperature with 1500  ℃. The aluminium can be anodized and dyed to many different decorative color due to its fine adhesive ability. Hence, the anodizing aluminium is widely used in many industries, such as aerospace, electronics, the constructions with different kinds of aluminium extrusion profile structure and the decoration of buildings.

2. Electrophoresis Coating:  The Electrophoresis coating can reduce pollution of air and water, and there is no risk on fire, as water is the disperse medium and the quantity of solubilizer is also tiny. The throwing power of coating material is great, which can cover the edge and gap of aluminium extrusion profile, and form a dense and even oxidation film. And the corrosion resistance of the whole parts is also great. The appearance quality of electrophoresis part is high, as there is no sagging, and there is no dissolvant condense on the surface of aluminium extrusion profile. Electrophoresis coating adapt the advanced RO recycle system, which can save chemical coating material and reduce the pollution to the environment. As the recycle rate of coating material is over 98% and the output of wast water is also few.

3. Powder Spraying: The surface of aluminium extrusion profile has great resistance to chemical medium as the resin molecular weight of powder spraying is bigger than the molecular weight of solvent based coating. The working time and batches can be saved greatly, as once powder spraying can obtain 50-300μm of coating layer. The aluminium extrusion product is sturdy and durable, as powder spraying has no sagging and pinhole defect which is caused when coated with solvent based coatings. The powder spraying can improve the cosmetic effect of aluminium extrusion profile, as it has multiple available color. The  quality of aluminium based surface and preprocess quality is not as strict as other two methods.

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