Anodizing aluminum alloy brake levers involves the electrochemical formation of a dense, hard, and wear-resistant alumina protective film on the aluminum surface. This process integrates surface strengthening with aesthetic enhancement and is widely used in high-precision components such as brake levers and aftermarket parts, significantly improving durability, corrosion resistance, and visual appeal.

I. Pre-treatment: Surface Cleaning and Leveling

Degreasing: Use an alkaline or neutral degreasing agent in combination with ultrasonic cleaning to remove surface oil and fingerprints.

Alkaline washing: A mild alkaline solution slightly etches the surface to remove the natural oxide layer and impurities.

Neutralization and acid pickling: remove residues from alkaline cleaning and ensure uniform surface activation.

Water rinsing: Each process step is rinsed with ultrapure water to prevent cross-contamination by chemical solutions.

Pre-treatment directly determines whether the oxide layer is smooth, color-neutral, and free of mottling.

II. Anodizing: The Core Film-Forming Stage

An aluminum alloy handle is used as the anode, and a lead plate or stainless steel is used as the cathode; the assembly is then immersed in a sulfuric acid electrolyte and subjected to an electric current.

Under the influence of electric current, oxidation occurs on the aluminum surface, resulting in the formation of an amorphous alumina film.

The coating layer features a porous honeycomb structure, with a typical thickness of 5–20 μm; for brake levers, a thickness of 8–12 μm is generally selected to balance strength and toughness.

This coating is fully bonded to the substrate, does not delaminate or flake, and exhibits a hardness comparable to hard anodizing—significantly higher than that of conventional spray coatings.

III. Dyeing: Imparting Color and Texture

The micropores formed during anodization exhibit exceptionally strong adsorption capacity, enabling coloration to meet customization demands for brake levers in black, silver, titanium, red, blue, and other finishes.

Immerse the oxidized workpiece in an organic or inorganic dye solution.

Dye molecules enter the micropores and are adsorbed and immobilized.

Even color, excellent sun resistance and fade resistance, with a smooth, non-slip texture.

If primary colors are desired, the dyeing step can be omitted.

IV. Sealing the Pores: Color Locking and Strengthening

The micropores must be sealed; otherwise, the coating layer is prone to water absorption, staining, and color fading.

Common methods include high-temperature boiling in water or salt-based sealing.

At high temperatures, the micropores expand and then close, firmly immobilizing the dye within the alumina layer.

After pore sealing, the coating exhibits significantly enhanced corrosion resistance, wear resistance, and fingerprint resistance.

V. Post-Processing and Testing

After pore sealing, the parts are thoroughly washed with water and dried, followed by inspections for appearance, coating thickness, adhesion, and corrosion resistance. Qualified anodized brake handle components exhibit a uniform matte or semi-matte surface finish, with no runs, blooming, or surface damage; their edges and corners demonstrate excellent wear and scratch resistance.

Summary

Anodizing gives aluminum alloy brake levers the following characteristics:

High hardness, wear resistance, and scratch resistance

Corrosion-resistant, rust-proof, and suitable for long-term outdoor use.

Color stability, premium texture, and comfortable feel

As a result, it has become the most mainstream and reliable surface-finishing process for motorcycle brake levers, and is the standard treatment for both OEM parts and high-end aftermarket components.