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Industrial aluminum anodic oxidation process


Development of aluminum industry;

Aluminum is one of the six major metal elements in nature. In China, aluminum is rich in resources, exceeding 2/3 of iron content, but far less than iron resources in resource development and utilization. The main reason is the lack of resource utilization and product development. At present our country has aluminum resources development as a key development project, its mainly embodies in the industrial manufacturing industry, industrial aluminum profile product development speed in our country in recent years, aluminum resources development capability and technology constantly improve, the rapid increase of product category aluminum resource utilization, to speed up the process of our aluminum resources development.

Chemical and physical properties of aluminum:

Aluminium has a silver-white surface and is light in weight. However, it has high electrical and thermal conductivity and ductility, and has high corrosion resistance compared with other metals. Pure aluminum is a very soft substance, which must be added with other alloying elements to improve its strength and hardness. Aluminum is a very active chemical element, which can be dissolved in both acids and bases. It is a typical bisexual substance, and a protective film will naturally form when exposed to the surface for a long time, which has a certain protective effect.

To make industrial aluminum bars, the west process should be as follows:

: Furnace heating.

(2) : mold design (mold is designed according to the needs of the product extrusion molding tool).

: The use of extrusion press (6063-T5 series common profile extrusion press is generally in 1300-1600 tons, such as the need to produce higher specifications profile need to use a higher understanding of the actual situation of the extrusion press) extrusion, through the mold to get different interface of the industrial aluminum profile products.

: Aluminum profile correction.

5. Straighten.

Aging (aging is a key step affecting the strength and hardness of industrial aluminum products)

: Oxidation treatment.

(8) sandblasting oxidation (sandblasting oxidation is the surface of refined profile stretch grain, and do the surface of the secondary treatment, can refine the surface of industrial aluminum profile micro hole, enhance the ability of oxidation).

Industrial aluminum profile oxidation treatment process:

(1) Surface treatment of aluminum profiles:

Aluminum profile surface treatment, also known as surface pretreatment, is the use of physical and chemical substances to remove the dirt on the surface of the aluminum profile, so that the exposed part of the aluminum profile body, convenient for the later oxidation treatment of the aluminum profile surface.

2. Surface degreasing process of aluminum profile:

The purpose of aluminum profile degreasing process is to remove industrial lubricating oil and anticorrosive oil as well as dirt and impurities attached to the surface of aluminum profile, to ensure even alkali corrosion of aluminum profile and to ensure the cleaning of alkali corrosion trough. Improve the surface treatment quality of aluminum profiles.

(3) Acid etching process of aluminum profile:

The acid etching process on the surface of aluminum profile is to remove the oxide formed after the oxidation of other metal elements on the surface of aluminum profile and the oxide film formed naturally in the profile. After the treatment of acid corrosion, water should be washed immediately. The washing temperature should be controlled at 50℃ earlier to avoid the appearance of flow marks on the profile surface, and then the flow water should be cleaned. Due to the copper element in the aluminum profile, the surface becomes dark after acid test. It needs to be soaked in nitric acid solution for 3-5 minutes to make the surface bright silver.

(4) Alkali corrosion technology of aluminum profile:

The main purpose of alkaline etching process of aluminum profiles is to remove the residue and metamorphism layer on the body surface of aluminum profiles during the oxidation process, and to eliminate the scratch defects left on the surface of aluminum profiles during the extrusion process. Alkali corrosion treatment plays an important role in the overall surface quality of aluminum profiles.

(5) Neutralization process of aluminum profiles:

Aluminum neutralization process is the purpose of removing aluminum after pickling treatment and alkali corrosion is not soluble in alkaline solution, left over from the surface of copper, manganese, iron, silicon and other alloying elements and impurities, and aluminum in the residual alkali liquor after alkali treatment, generally adopted method is to use 30% 50% nitric acid solution, for high silicon aluminum alloy casting alloy, using nitric acid and hydrogen fluoride 1:3 volume ratio of mixed acid. Silicon reacts with hydrogen and hydrofluoric acid to form fluosilicic acid and leave the surface of aluminum.

6 aluminum profile anodic oxidation treatment:

Aluminum anodic oxidation treatment method is to through the solution as medium, using cutting-edge discharge to form a layer of oxide film on the surface of aluminum, aluminum extrusions with super corrosion resistance, because after anodic oxidation of aluminium profile of protective layer with high hardness and corrosion resistance, the standard thickness in 10-12 mu, can better improve the oxidation resistance of aluminum and improve the profile of the aesthetic.

Sulfuric acid anodizing is commonly used 10-20%H2SO4 as electrolyte, working temperature 15-20℃, current density 1-2.5A/dm2, electrolytic time depends on the requirements of film thickness, generally within 20-60min. Dc power supply is the most common, and the applied voltage varies depending on the conductivity, temperature and aluminum content of the electrolyte, generally 15-20V, and the process parameters have a significant impact on the film performance.

7 aluminum profile surface sealing treatment:

Aluminum surface after anodic oxidation treatment can form micro hole, easy to oxidation corrosion in the process of using, to make A hole sealing after anodic oxidation treatment processing, industrial aluminum anodic oxidation after hole sealing treatment commonly used cold empty process (cold hole sealing technology originated in Europe), sulfuric acid anodic oxidation used 10-20% - H2SO4 as electrolyte, temperature 15-20 ℃, the current density of 1-2.5 A/dm2, electrolytic time depending on the film thickness requirements, generally 20 to 60 min. Dc power supply is the most common, and the applied voltage varies depending on the conductivity, temperature and aluminum content of the electrolyte, generally 15-20V, and the process parameters have a significant impact on the film performance.

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