Common Anodized Finishes
Surface finish options, coating thickness, appearance factors,
and inspection considerations for anodized aluminum extrusion profiles.
Anodized aluminum extrusion profiles are widely used for aluminum enclosures, heat sinks, communication equipment, and industrial products.
This article covers common anodized finishes, surface preparation methods, coating thickness, appearance considerations, inspection requirements, and typical applications.
Common Anodized Finishes
Natural anodized, black anodized, and color anodized finishes are commonly used for aluminum extrusion profiles, enclosures, heat sinks, and machined aluminum components.
Natural Anodized Finish
Natural anodized aluminum profiles retain a silver surface.
Black Anodized Finish
Black anodized aluminum profiles are commonly used for electronic enclosures, communication equipment, heat sinks, and industrial products.
Color Anodized Finish
Blue, gold, bronze, green, red, and other anodized colors are available according to product requirements.
Surface Preparation Before Anodizing
Common operations include brushing, sand blasting, polishing, cleaning, and degreasing.
Anodizing does not remove scratches, dents, machining marks, or extrusion lines already present on the aluminum surface.
Brushed Surface
Brushing produces a directional grain pattern on the aluminum surface.
Brushed finishes are commonly used for enclosure panels, covers, and visible aluminum components.
Sand Blasted Surface
Sand blasted surfaces have a uniform matte appearance before anodizing.
Sand blasting is commonly used for electronic enclosures, industrial equipment, and machined aluminum components.
Polished Surface
Polished surfaces have a smoother appearance before anodizing.
The final surface condition depends on both the polishing quality and the anodizing process.
Surface preparation is typically selected before machining samples are approved, as the surface condition directly affects the final appearance after anodizing.
Anodizing Thickness
Anodizing thickness varies according to product requirements and finishing specifications.
Standard Anodizing
Standard anodizing is commonly used for aluminum enclosures, heat sinks, extrusion profiles, and industrial components.
Typical coating thickness ranges from 5 μm to 25 μm.
Hard Anodizing
Hard anodizing provides a thicker oxide layer than standard anodizing.
Typical coating thickness ranges from 25 μm to 60 μm.
Thickness Measurement
Anodizing thickness is measured after finishing to verify coating requirements.
Coating thickness may be measured at multiple locations on the component.
The measured coating thickness may vary slightly between different areas of the same component depending on profile geometry and processing conditions.
Anodizing thickness should be considered when tight dimensional tolerances are required.
Design Considerations for Anodized Aluminum Profiles
Several manufacturing factors can influence the final appearance of anodized aluminum profiles.
Extrusion Lines
Extrusion lines may be more visible on black anodized surfaces and large flat areas.
Machining Marks
Machining marks may be visible after anodizing depending on surface preparation and finish requirements.
Contact Points
Electrical contact is required during the anodizing process. Contact marks are typically located on non-visible surfaces.
Deep Grooves and Cavities
Deep grooves and narrow slots may require additional consideration during anodizing.
Surface Preparation
Brushed, sand blasted, and polished surfaces can produce different appearances after anodizing.
Quality Inspection After Anodizing
Finished components are inspected after anodizing according to product specifications and appearance requirements.
Surface Appearance Inspection
Surface appearance is checked for scratches, dents, color variation, and visible surface defects.
Coating Thickness Inspection
Coating thickness is measured to verify anodizing requirements.
Final Inspection Before Shipment
Finished components are inspected before packaging and shipment.
Typical Applications
Anodized aluminum extrusion profiles are widely used for electronic enclosures, heat sinks, communication equipment, industrial equipment, and structural aluminum components.
Need Custom Anodized Aluminum Extrusion Profiles?
Glary provides aluminum extrusion, CNC machining, anodizing, hard anodizing, and assembly services for custom aluminum components.
Contact us to discuss your project requirements.
Or email us directly: sophia@glarysh.com