Surface finishing is the process of altering a manufactured part's surface to achieve desired properties like improved appearance, corrosion resistance, wear resistance, or electrical conductivity.
At REKO, we understand that the final surface finish is as important as the part itself. That’s why we don’t just provide CNC machining—we also offer a full suite of surface finishing options to meet your exact needs. From aesthetics to corrosion resistance, we’ve got you covered. Whether you're in aerospace, automotive, medical, or consumer electronics, our surface finishing capabilities ensure your parts are ready to perform—and impress.
In addition to our precision CNC machining services, we offer a comprehensive array of surface finishing solutions tailored for machined components.
As Machined This finishing option offers significant cost savings with natural machine marks, making it ideal for prototype validation, functional testing, or applications where residual machining texture is acceptable per engineering specifications.
Bead Blast Machined parts are bead blasted with glass beads to achieve a uniform, grainy texture and eliminate machining marks.
Polishing Polishing delivers a high-luster finish, reducing surface roughness (Ra < 0.8μm) and enhancing metal aesthetics. It utilizes mechanical abrasion or chemical treatmentto create a smooth, reflective surface.
Anodizing Anodizing improves corrosion resistance and wear properties, and enables color dyeing, making it perfect for aluminum parts.
Black Oxide Black oxide is a conversion coating applied to ferrous materials to provide mild corrosion resistance, enhance appearance, and to minimize light reflection.
Heat Treatment Heat treatment modifies metals via controlled heating/cooling to alter crystalline structure, enhancing hardness, temperature resistance, ductility, and strength.
Brushed Finish A brushed finish is achieved using a wire brush or abrasive pad, creating attractive lines called 'grain'. This finish is visually appealing and resistant to scratches and fingerprints, minimizing visible marks.
Powder Coating Powder coating applies powdered paint to surfaces, which are baked in ovens to form wear-resistant and corrosion-proof layers with vibrant colors and textures for enhanced durability.
Plating Plating is a type of coating in which a metal is deposited on a conductive surface. corrosion-resistant properties, enhanced solderability, hardness, and reduced friction, including Nickel Plating, Silver Plating, Gold Plating, Chrome Plating, Zinc Plating, and Tin Plating.
Painting Painting is a versatile and widely used metal finishing technique that provides both protection and aesthetic enhancement for metal surfaces. Appearance ideal for automotive, aerospace, and industrial applications
Passivation Passivation is a common metal finishing . For stainless steel, this process involves using nitric acid or citric acid to eliminate free iron from the surface. This chemical treatment creates a protective oxide layer, or passivation film. Significantly enhancing its resistance to rust
Laser Engraving/CNC engraving Laser engraving uses focused beamo of light to quickly and accurately create permanent designs on materials, It is commonly used to add part numbers, or logos. CNC engraving involves creating intricate designs and shapes on surfaces using a CNC machine.
| Surface Finish | Cost | Compatible Materials | Key Functional Features | Surface Roughness (Ra) | Appearance |
| Anodizing | $ | Aluminum | Corrosion resistance, electrical insulation, color options | 0.8–1.6 μm | Matte or colored, uniform tone |
| Electroplating | $$$ | Steel, Brass, Zinc, Copper | Wear resistance, conductivity, corrosion protection, aesthetic enhancement | 0.2–1.0 μm | Bright, metallic, reflective |
| Sandblasting | $ | Most metals | Removes surface defects, improves paint adhesion, provides uniform matte texture | 2.5–6.3 μm | Matte or frosted, non-reflective |
| Spray Painting | $$$ | Metals, Plastics | Decorative coating, mild corrosion resistance, customizable color | 1.6–3.2 μm | Glossy, satin or matte depending on paint |
| Heat Treatment | $$$$ | Steel, Aluminum Alloys | Increases hardness, strength, wear resistance; affects internal structure | No surface change | No visible difference |
| Polishing | $$$$$ | Aluminum, Stainless Steel | Mirror finish, low friction, improves appearance and cleanliness | 0.05–0.2 μm | Shiny, mirror-like |
| Brushing | $$$ | Aluminum, Stainless Steel | Creates directional grain, improves aesthetics, masks minor flaws | 0.8–1.6 μm | Satin, fine-lined texture |
| Powder Coating | $$$ | Most metals | Durable, chip-resistant coating, excellent color range, good for outdoor use | 1.6–3.2 μm | Thick, smooth or textured depending on type |
| Passivation | $ | Stainless Steel | Removes free iron, enhances corrosion resistance without changing dimension or color | No surface change | Slight sheen, unchanged base appearance |
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