1. Anodizing
This is the most mainstream surface treatment process for aluminum profiles, which forms a dense oxide film (mainly composed of aluminum oxide) on the surface of the
Aluminum Profile through electrolysis.
Core advantages: strong corrosion resistance, high hardness, good adsorption (can be dyed), environmentally friendly, and no harmful substance precipitation.
Common types
Ordinary anodizing: produces transparent or natural color oxide film, suitable for industrial components with basic requirements for corrosion resistance.
Hard anodizing: The film thickness can reach 20-200 μ m, with extremely high hardness, wear resistance, and high temperature resistance, suitable for mechanical parts and aerospace components.
Color anodizing: After oxidation, various colors such as black, gold, and red are achieved through dyeing processes to meet the appearance requirements of building decoration, furniture, and other materials.
Buyer's focus: film thickness, salt spray test duration, color uniformity.
2. Electrophoretic Coating
It belongs to the electrochemical coating process, which deposits organic resin uniformly on the surface of profiles through the action of an electric field on the basis of anodizing.
Core advantages: Strong coating adhesion, scratch resistance, rich color and high glossiness, better weather resistance than ordinary spraying, suitable for building profiles such as doors, windows, curtain walls, etc.
Classification: Anodic electrophoresis (applicable to aluminum profiles), Cathodic electrophoresis (less commonly used for aluminum profiles).
Buyer focus: coating thickness, UV resistance, environmental certification (such as EU REACH standard).
3. Powder Coating
Using the principle of electrostatic adsorption, powder coating is sprayed onto the surface of aluminum profiles, and then cured at high temperature to form a coating.
Core advantages: Uniform coating thickness, wide range of color options (matte, high gloss, metallic, etc.), good impact resistance, corrosion resistance, and solvent-free coating, environmentally friendly.
Applicable scenarios: building exterior walls, guardrails, furniture, industrial equipment enclosures, etc.
Buyer's focus: powder brand, curing temperature, weather resistance (up to 10-20 years for outdoor use).
4. Fluorocarbon Coating
It is a high-end upgraded version of powder coating, using fluorine-containing resin coatings (such as PVDF), divided into two coating, three coating, and four coating processes.
Core advantages: Super weather resistance, UV resistance, acid rain resistance, corrosion resistance, long-lasting color without fading, and a service life of over 25 years.
Applicable scenarios: high-end building curtain walls, outdoor profiles in coastal areas, industrial components in highly corrosive environments.
Buyer focus: PVDF resin content (national standard requirement not less than 70%), salt spray test and accelerated aging test data.
5. Mechanical polishing and chemical polishing (Polishing)
The core purpose is to improve the surface smoothness of aluminum profiles.
Mechanical polishing: Through physical methods such as grinding and wire drawing, the surface presents a delicate metallic luster or wire drawing texture, suitable for decorative parts and electronic product casings.
Chemical polishing: Using chemical reagents to corrode the surface of profiles, remove burrs and oxide layers, and obtain a uniform and bright surface. It is often used as a pre-treatment process before anodizing.
Buyer focus: Surface roughness (Ra value), texture consistency.
6. Passivation treatment
A low-cost anti-corrosion pretreatment process that forms a passivation film on the surface of aluminum profiles using chemical reagents to inhibit oxidation reactions.
Core advantages: Simple operation, low cost, suitable for industrial internal parts with low appearance requirements, or as a base treatment before spraying or electrophoresis.
Buyer's focus: Environmental friendliness of passivating agents, rust prevention and aging.
7. Heat Transfer Printing
A surface treatment process used to simulate natural textures such as wood grain and stone grain, transferring the patterns on the transfer film to the surface of aluminum profiles through high temperature.
Core advantages: Realistic appearance, good texture, replacing solid wood and stone, combining the lightweight and durable characteristics of aluminum profiles.
Applicable scenarios: Home doors and windows, decorative lines, partitions, etc.
Buyer's focus: pattern adhesion, scratch resistance, texture simulation.
