Analysis of the Oxidation Treatment Process Characteristics of High-Durability Aluminum Alloy Doors

Analysis of the Oxidation Treatment Process Characteristics of High-Durability Aluminum Alloy Doors

In the field of building materials, aluminum alloy doors have become a common choice in engineering construction and commercial projects due to their advantages of being lightweight, environmentally friendly and easy to process. The core factors determining the service life and user experience of aluminum alloy doors, apart from the quality of the base material, the oxidation treatment process is even more crucial. For builders, engineering purchasers and building materials distributors, understanding the oxidation treatment process characteristics of high-durability aluminum alloy doors can help them more accurately screen products that meet long-term usage requirements. This article will conduct an in-depth analysis of this core technology that affects the performance of aluminum alloy doors from aspects such as the process principle, characteristics of core steps, and practical application value.

First, the core principle of oxidation treatment for aluminum alloy doors

The core of the oxidation treatment process adopted by high-durability aluminum alloy doors is the anodizing technology of aluminum alloy. Its essence is to form a dense and hard oxide film on the surface of the aluminum alloy door through electrolysis. Unlike the loose film formed by natural oxidation, the oxide film generated by artificial anodizing is closely bonded to the substrate, with uniform thickness. It can effectively isolate air, moisture and various corrosive media, fundamentally enhancing the weather resistance and service life of aluminum alloy doors.

During this process, the aluminum alloy door is placed as the anode in an electrolyte solution. By applying specific current and voltage, an oxidation reaction occurs on the anode surface, generating an Al₂O₃ oxide film. This oxide film itself has extremely high hardness and good adsorption capacity. After subsequent sealing treatment, its protective performance and durability will be further enhanced, fully meeting the building usage requirements in different climate environments.

Second, the key process steps and characteristics of high-durability oxidation treatment

2.1 Pretreatment: The fundamental guarantee for oxidation effect

Pretreatment is the first step of oxidation treatment and also the core link that determines the quality of the subsequent oxide film. It mainly includes three processes: degreasing, alkali washing and neutralization. The degreasing process uses environmentally friendly degreasing agents to thoroughly remove oil stains, dust and processing residues on the surface of aluminum alloy doors, preventing oil stains from affecting the adhesion of the oxide film. Alkali washing is a process that uses a mild alkaline solution to corrode and remove the oxide scale and impurities on the surface, making the substrate surface present a uniform micro-rough state and providing a good adhesion basis for the formation of the oxide film. The neutralization process is used to neutralize the residual alkali solution after alkali washing, prevent local corrosion and ensure the consistency of the substrate surface.

The core feature of this step is "refinement", which requires strict control over the degreasing temperature, alkali washing time and neutralization concentration. Unlike the extensive pretreatment of ordinary oxidation treatment, the high-durability process ensures that there is no residue on the substrate surface through multiple cleaning procedures, avoiding problems such as oxide film peeling and wrinkling due to inadequate pretreatment.

2.2 Anodizing: The core step in forming a high-hardness oxide film

Anodic oxidation is the core of the entire process, and the control of its process parameters directly determines the performance of the oxide film. High-durability aluminum alloy doors typically employ a sulfuric acid anodizing system, which undergoes electrolysis at specific temperatures (18-22℃) and current densities (1.5-2.5A/dm²). During this process, the oxide film gradually thickens as the electrolysis time extends. The oxide film thickness of conventional high-durability products can reach 10-15μm, and for some products with special requirements, it can exceed 20μm.

The notable feature of this stage is the "uniform and dense film layer". By precisely controlling the electrolytic parameters, it can be ensured that the corners, grooves and other complex parts of the aluminum alloy door can form an oxide film of uniform thickness, avoiding insufficient protection caused by overly thin local film layers. Meanwhile, the generated oxide film has extremely high hardness, with a Mohs hardness of up to 7-8, which can effectively resist daily collisions and frictions and reduce surface scratches.

2.3 Sealing treatment: A key finishing touch for enhancing durability

The surface of the oxide film formed by anodic oxidation has a large number of tiny pores. If no sealing treatment is carried out, these pores will become channels for moisture and corrosive media, reducing the protective effect. The sealing process mainly adopted for high-durability aluminum alloy doors is hot water sealing or low-temperature sealing. By placing the oxidized aluminum alloy door into a sealing liquid at a specific temperature, the pores of the oxide film are sealed, forming a complete protective layer.

The feature of this step is "thorough sealing and strong stability". After sealing treatment, the water absorption rate of the oxide film can be reduced to below 1%, effectively resisting the erosion of harsh environments such as acid rain and salt spray. It is especially suitable for coastal areas, industrial zones and other scenarios with strong corrosiveness, which can extend the service life of aluminum alloy doors to more than 15 years and significantly reduce subsequent maintenance costs.

Third, the core application value brought by the oxidation treatment process

For construction projects, aluminum alloy doors that adopt high-quality oxidation treatment processes not only enhance the overall quality of the building but also reduce maintenance and replacement costs during long-term use. From the perspective of performance, aluminum alloy doors that have undergone professional oxidation treatment possess excellent corrosion resistance, wear resistance and weather resistance, and can adapt to various environments such as high temperature, high humidity and high dust. From the perspective of appearance, the oxide film can present a natural metallic luster, and the color is stable and not easy to fade, which can maintain the long-term beauty of the aluminum alloy door. From an environmental perspective, the anodizing process does not require the use of harmful solvents, which is in line with the development trend of green buildings.

In addition, the excellent adsorption property of the oxide film also provides the possibility for subsequent coloring. According to the architectural style requirements, aluminum alloy doors of different colors can be customized, taking into account both practicality and decoration. Whether it is commercial office buildings, hotel projects or residential projects, high-durability oxidized aluminum alloy doors can meet the core requirements for long-term use.

In conclusion, the oxidation treatment process is the core factor determining the durability of aluminum alloy doors. The refinement of pre-treatment, the precision of anodizing, and the thornness of sealing treatment jointly form the quality foundation of highly durable aluminum alloy doors. For purchasers who focus on the long-term performance of products and the quality of projects, a thorough understanding of these technological features is the key to screening high-quality aluminum alloy door products.