Sandblasted Anodized Black

Sandblasted anodized black is a surface treatment process that creates a matte black appearance on aluminum profiles through sandblasting and anodizing. This process complies with the GB/T 5237.2 "Aluminum Alloy Building Profiles Part 2: Anodized Profiles" standard.
Process Steps: (1) Sandblasting Treatment:
1.Surface Cleaning: Remove oil and dust from the surface of the aluminum profiles.
2.Sandblasting: Use high-pressure air to blast fine sand particles onto the aluminum surface, creating a uniform matte effect and enhancing surface roughness.
(2) Anodizing:
1.Electrolyte Preparation: Place the sandblasted aluminum profiles in an electrolyte bath containing sulfuric acid with black dye, and connect them to form an electrolytic circuit.
2.Electrolytic Reaction: Apply direct current in the electrolyte bath, causing a uniform black oxide film to form on the aluminum surface.
3.Control Parameters: Control current density and treatment time to ensure the thickness and uniformity of the oxide film.
(3) Sealing:
1.Hot Water Sealing: Immerse the anodized aluminum profiles in hot water to close the micro-pores in the oxide film, enhancing corrosion resistance.
2.Chemical Sealing: Alternatively, use a nickel salt solution for sealing to further improve the oxide film's performance.
3.Inspection and Drying: Inspect the surface to ensure the oxide film is uniform and defect-free, then dry the profiles.
Features: Matte black surface, slip-resistant, wear-resistant, aesthetically pleasing.
Applications: Used in high-end electronic product housings, automotive parts, and architectural decorations.