6063 5052 Clear Anodised Aluminium Chromic Acid Anodized Aluminum Tubes

Product Specification

6061 6063 5052 7075 Aluminum Tube Anodized Aluminum Products Ordinary Anodized Process Metal Surface Treatment anodizing aluminum tubes

The manufacturing process of anodizing aluminum tubes includes the following steps:
1. Surface cleaning: Clean the aluminum parts to remove dirt, oil or previous coatings.
2. Electrolytic reaction: The cleaned aluminum is immersed in an acid electrolyte and a thick, controlled oxide layer is formed by applying an electric current.
3. Coloring and sealing: As needed, the parts can be dyed and sealed to improve corrosion resistance and aesthetics, decorativeness, etc.
Anodizing is an electrochemical process that plays an important role in improving the durability of materials in terms of wear and corrosion. It enhances beauty by changing the surface finish of non-ferrous metals such as copper, titanium, manganese, magnesium, zinc and stainless steel. The process requires immersing the metal in an acid bath and allowing it to act as an anode while an electric current is passed through the metal to form a thin layer of metal oxide.

There are three main types of anodizing:
There are three types of anodizing: Type I, using chromic acid; Type II, using sulfuric acid; Type III, hard coating.
These variations depend on the type of acid used and the thickness of the film produced.

How to anodize aluminum?

1. First, the aluminum part or sheet needs to be washed with water to wash off any dirt on its surface.

The surface finish of the coating can be either bright or satin, depending on the desired appearance. The satin finish is produced by light etching, which produces a uniform matte surface. In bright dip anodizing, phosphoric acid and nitric acid solutions are used to produce the bright surface.

2. Depending on the anodizing method, a chromic acid or sulfuric acid bath is used. The aluminum is immersed in an acidic electrolyte solution while an electric current is passed through to form the anodized layer. After the process is over, the item is removed from the bath, wiped clean, and then left to dry.

3. Another process that can be performed after anodizing is to dye the aluminum part in different colors. Electrolytic coloring is done by immersing the anodized aluminum in an inorganic metal salt bath and applying an electric current to oxidize the aluminum oxide layer at the micropores. The final color obtained depends on the chemical composition of the solution and the immersion time. The most common anodized colors are gold, black, clear, brown, bronze, and nickel.

4. Sealing: During the processing, ensure that the metal is sealed to avoid corrosion and water from entering the metal. Black anodized aluminum can be sealed using cold and heat sealing techniques. Extrusion or both techniques can be used. Sealing helps prevent the surface from being scratched or stained.

Advantages of Anodizing
1. Corrosion Protection
2. Durability
3. Improved Appearance
Anodizing has several advantages that make it suitable for aluminum parts, especially when durability and quality are very important. Compared with paint or powder coating, the oxide layer formed during the anodizing process chemically bonds to the aluminum surface and is less likely to chip, peel or crack. This superior adhesion and adhesion also helps explain why anodized surfaces are very durable and can be used for many years.
In addition, anodizing can greatly increase the surface hardness of the part, up to Rockwell 70C. This hardness makes the part strong enough to withstand rigorous use without wearing out. Anodized parts are generally very durable and may not require frequent repairs such as oiling, conditioning or repainting. In addition, hard anodized aluminum has good electrical insulation, which is very useful when other insulating materials are ineffective.