Popular science on door and window technology: 5 common surface treatment methods for aluminum profiles
As for your doors and windows, the surface treatment process of its aluminum alloy profiles directly plays a decisive role in its service life, whether it is five years or twenty years. Currently, there are five common treatment methods on the market, namely anodizing, electrophoretic coating, powder spraying, fluorocarbon spraying and porcelain spraying. The effects and costs of each treatment method are very different.
Powder coating with rich colors and moderate cost
The principle of electrostatic adsorption is used in powder spraying. The spray gun makes the powder particles positively charged and the aluminum profiles negatively charged. Once the two come into contact, the powder is firmly adsorbed on the surface. According to the statistics of the domestic construction aluminum profile market in 2025, powder coating actually accounts for about 45% of the market share. It is mainly used in indoor partitions, office furniture, and ordinary doors and windows.
This process is cured at high temperatures of 180 to 200 degrees Celsius, and the resulting coating thickness is typically in the range of 60 to 120 microns. Compared with other processes, the most outstanding benefit of powder spraying is the extremely rich color selection, from pure white to wood grain color. Its disadvantage is that it has poor UV resistance. When used on windows that are severely exposed to western sun, fading or chalking may occur after three to five years.
The electrophoretic coating is smooth and delicate but is afraid of scratches
The aluminum profile is first anodized, and then under the action of an electric field, water-soluble acrylic resin is evenly deposited in the micropores of the oxide film. This is an anodized surface treatment of aluminum rivets with electrophoretic coating and an acrylic paint film added to the anodized film . This composite structure can make the surface as smooth as a mirror and feel extra delicate.
This technology was first applied to aluminum alloy doors and windows in the 1970s by anodizing surface treatment of Japanese aluminum rivets . The electrophoretic coating has strong salt spray corrosion resistance, and its salt spray corrosion resistance can reach more than 1,000 hours. However, its hardness is only between 2H and 3H. A slight scratch with a key or gravel will leave obvious marks, so it is more suitable for use in places such as indoor decorative strips and bathroom partitions that are not prone to bumps.
Fluorocarbon spray has the strongest outdoor weather resistance
Fluorocarbon spraying uses polyvinylidene fluoride resin, which is PVDF coating. The material contains a high fluorine content and the carbon-fluorine bond has extremely strong bond energy, so it can resist the damage of ultraviolet rays and acid rain. The aluminum panels on the facade of the Shanghai Tower are sprayed with fluorocarbon. After more than ten years of exposure to wind and sun, the color is still bright.
Fluorocarbon coating requires primer spraying, topcoat spraying, and varnish spraying. The total thickness of these three layers of spraying is between 40 and 60 microns. Its cost is two to three times that of powder spraying. However, its color retention period can reach more than 20 years. Door and window technology Popular science: There are 5 common surface treatment methods for aluminum profiles. Airport terminals have high requirements for durability. These buildings will specify fluorocarbon spraying. Beach villas have high requirements for durability. These buildings will also specify fluorocarbon spraying. The disadvantage is that there are more spraying processes and the construction period is relatively long.
Anodized metal texture with good wear resistance
Anodizing is a form of electrochemical treatment. An aluminum alloy profile is placed in an electrolyte. After the power is turned on, an aluminum oxide film will be formed on the surface. The hardness of this film is extremely high. The Mohs hardness can reach 9, second only to diamond. The oxide film presents a porous structure and can subsequently be dyed or sealed.
In the field of industrial aluminum profiles, such as assembly line brackets and equipment frames, anodizing is the most common choice. It has extremely strong wear resistance. Even if the anodizing surface treatment of friction aluminum rivet weldments is repeated, it is not easy to expose the bottom. However, the oxide film will suffer corrosion in strong acid and alkali environments. If it is used in coastal areas, it needs to be equipped with a sealing process, and anodizing can only produce a few metal colors such as silver and bronze, and the color choices are very limited.
Porcelain spray coating has high-end texture and high price
Porcelain swimming spray can be regarded as an advanced version of powder spraying. The surface of ordinary powder spraying is prone to undulations like orange peel. Porcelain swimming spray relies on finer powder particles and more precise curing temperature control, resulting in a surface as smooth and silky as ceramics. This texture is particularly suitable for high-end home decoration doors and windows.
Since 2020, the Foshan area of Guangdong has begun to promote the porcelain swimming process. There are currently more than a dozen professional production lines. The glossiness of the porcelain swimming surface can achieve a matte effect of less than 10 degrees, and fingerprints are not easy to stain. However, its unit price is 40% to 60% higher than that of ordinary powder coating. If you have a sufficient budget for decoration and are pursuing the ultimate touch feel, porcelain spray coating is worth considering.
Having said so much, in fact there is no absolutely best appearance, only the choice that perfectly suits your home environment. So the question arises: Is the area where your home is located a humid and rainy place like a coastal city in the south, or is it a dry and windy place like a northern area? Will you pay more attention to the corrosion resistance of heavy-duty materials, the richness of color, or the feeling of the surface? Welcome to share your thoughts in the comment area, like this article and save it. You can use it as a reference next time when choosing door and window profiles.
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