Aluminum profiles are widely used in various industries due to their exceptional strength, lightness, and corrosion resistance. To enhance these properties and meet specific aesthetic requirements, surface treatments like sandblasting oxidation and anodizing are often employed. In this blog, we will delve into the differences between these two techniques, highlighting their processes, outcomes, and applications.

I. Sandblasting Oxidation

A. Process:
Sandblasting oxidation, also known as mechanical oxidation, is a surface treatment technique that involves physically abrading the aluminum surface with sand particles or other abrasive materials. This process creates a rough texture on the surface, enabling better adhesion of the oxide layer.
B. Outcome:
1. Surface Texture: Sandblasting imparts a distinctive textured appearance to aluminum profiles, giving them a matte or satin finish.
2. Oxide Layer Thickness: The thickness of the resulting oxide layer typically ranges from 2 to 15 microns, depending on the desired outcome.
C. Applications:
1. Decorative Purposes: Sandblasting oxidation is commonly used in architectural applications where a visually appealing, non-reflective surface finish is desired.
2. Improved Adhesion: The roughened surface created through sandblasting enhances the adhesion of subsequent paint or coating applications.


Anodizing of Aluminum Profiles

II. Anodizing

A. Process:
Anodizing is an electrochemical process that involves the formation of a controlled oxide layer on the aluminum surface. It is achieved by immersing the profiles in an electrolyte bath and passing a direct current through them. This causes the release of oxygen ions, which react with the aluminum to form a thick, uniform, and durable oxide layer.
B. Outcome:
1. Surface Finish: Anodizing offers a variety of surface finishes, including matte, satin, and high-gloss, depending on the electrolyte composition and voltage used during the process.
2. Oxide Layer Thickness: Anodizing typically results in an oxide layer thickness ranging from 5 to 25 microns, providing enhanced corrosion resistance and durability.
C. Applications:
1. Corrosion Resistance: are extensively used in industries such as construction, automotive, and aerospace, where corrosion resistance is crucial.
2. Aesthetic Appeal: Anodizing offers a range of color options, allowing for customization and aesthetic enhancement of aluminum profiles.

III. Comparing Sandblasting Oxidation and Anodizing

A. Appearance:
1. Texture: Sandblasting oxidation results in a rougher surface compared to anodizing.
2. Color: While sandblasting oxidation imparts a natural metallic appearance, anodizing provides a wider range of color options, including vibrant hues.
B. Corrosion Resistance:
1. Sandblasting oxidation does not significantly improve the corrosion resistance of aluminum profiles, whereas anodizing enhances it substantially.
C. Durability:
1. greater durability than those subjected to sandblasting oxidation due to the thicker oxide layer formed.
D. Complexity and Cost:
1. Sandblasting oxidation is a relatively simpler and less expensive process compared to anodizing.
2. Anodizing involves more complex equipment and precise control over process parameters, making it costlier.
E. Versatility:
1. Anodizing offers a broader range of applications due to its superior corrosion resistance, customizable colors, and overall durability.


Sandblasting Oxidation of Aluminum Profiles


Both sandblasting oxidation and anodizing are effective surface treatment techniques for aluminum profiles, each with its unique attributes and applications. Sandblasting oxidation provides a textured finish and improved paint adhesion, making it suitable for decorative purposes. On the other hand, anodizing offers enhanced corrosion resistance, durability, and a wider range of colors, making it ideal for industries where function and aesthetics are equally important. Understanding these differences allows for informed decision-making when choosing.


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