What Surface Options Can Apply On CNC Machined Aluminum Parts?
Explore 6 aluminum surface treatments for CNC machined parts. Huizhou Hefa offers precision machining with expert finishing services – get durable, aesthetic components.
Aluminum CNC machining produces precise components, but surface finishing determines both functionality and appearance. As an ISO-certified CNC machining specialist with 15+ years of experience,Huizhou Hefa provides both precision machining and professional surface treatments to meet industrial standards.
1.Anodized(Best for Durability & Color Options)
Anodizing (Anodic Oxidation) – The electrochemical oxidation of metals or alloys. Specifically for aluminum and its alloys, this is a process where an oxide layer is formed on the aluminum product (acting as the anode) in a corresponding electrolyte under specific process conditions, driven by an applied electric current. Unless otherwise specified, anodizing typically refers to sulfuric acid anodizing.
To address the limitations of aluminum alloys in terms of surface hardness, wear resistance, and other properties—while expanding their application range and extending service life—surface treatment has become an essential step in aluminum alloy usage. Among these treatments, anodizing is the most widely adopted and successful method.
Our Capabilities: Type II (standard) and Type III (hard coat) anodizing
20+ color options with RAL matching Thickness control: 5-50μm
We can cutom pantone color for anodizing if you have special requirements.
Why Choose Us? Our in-house anodizing line ensures quality control from machining to finishing.
2.Bead Blasting/Sandblast (Uniform Matte Finish)
Raw Surface VS Bead Blasting
Bead blasting is a mechanical surface treatment that propels fine abrasive media (typically glass or ceramic beads) at high pressure to create a uniform, matte finish on CNC-machined aluminum components.
This process effectively removes tool marks, oxidation, and minor imperfections while improving paint adhesion and corrosion resistance. The non-directional texture produced enhances aesthetic appeal and provides a smooth tactile feel. Commonly used for medical devices, aerospace components, and consumer electronics, bead blasting offers repeatable results with precise surface roughness control (typically Ra 0.8-3.2μm). As an ISO-certified manufacturer, we utilize automated blasting systems to ensure consistent finishes across production batches while maintaining tight tolerances.
3.Powder Coating (Superior Corrosion Resistance)
Powder coating is an advanced dry finishing process where electrostatically charged polymer powder is applied to aluminum components and cured under heat to form a tough, uniform layer. This environmentally friendly technique produces superior corrosion and chemical resistance compared to liquid paints, with excellent adhesion to machined surfaces. Available in matte, glossy, or textured finishes, it offers UV stability and color retention for outdoor applications. Our facility utilizes automated electrostatic spray systems with chrome-free pretreatment, ensuring MIL-STD compliance for aerospace, automotive, and architectural components. With thickness control of 50-150μm and optional conductive coatings, we deliver both protective performance and aesthetic customization.
Technical Specs: Matte/gloss/textured finishes
Salt spray resistance: 500-1000+ hours
Operating temp: -40°C to 120°C
4.Mirror Polished (Ultimate appearance)
Mirror polishing is a precision finishing process that transforms machined aluminum surfaces into flawless, reflective planes with roughness levels below Ra 0.05μm. Through multi-stage mechanical polishing and buffing with diamond compounds, we eliminate all microscopic imperfections to achieve optical-grade clarity. This ultra-smooth surface reduces friction, minimizes particle adhesion, and enhances corrosion resistance—ideal for medical instruments, luxury components, and optical applications.
Our facility combines robotic polishing systems with manual craftsmanship to produce distortion-free mirror finishes while maintaining tight dimensional tolerances (±0.01mm). The process improves cleanability and light reflectivity up to 95%, meeting pharmaceutical and semiconductor industry standards.
5.Brushed Surface(Elegant Textured Surfaces）
Brushed finishing creates uniform directional grain patterns on aluminum components through precision abrasion techniques. This decorative surface treatment produces distinctive linear, circular, or crosshatched textures while maintaining dimensional integrity.
Our CNC-controlled brushing machines achieve consistent Ra 0.4-1.6μm surface finishes ideal for consumer electronics, architectural hardware, and automotive trim. The process enhances wear resistance and hides minor surface imperfections better than polished finishes. We offer customized grain direction control (±2° tolerance) and can combine brushing with subsequent anodizing for enhanced durability. As a value-added service, we provide material-matched finish samples to ensure visual consistency across production batches.
6.Electroplating( Enhanced Surface Performance)
Electroplating deposits a thin metallic coating (such as nickel, chrome, or zinc) onto aluminum components through electrochemical processes. This technique significantly improves surface hardness, wear resistance, and corrosion protection while providing decorative metallic finishes.
Our advanced plating facility offers multiple options, including:
-Nickel plating (5-25μm) for superior abrasion resistance
-Chrome plating for high reflectivity and durability
-Zinc plating with chromate conversion for cost-effective corrosion protection
We utilize specialized zincate pretreatment to ensure perfect adhesion on aluminum substrates. Our process meets ASTM B253 and MIL-STD standards, serving aerospace, automotive, and electronic applications.
Huizhou Hefa Electronic Co.,Ltd,professional in providing CNC machined aluminum parts with different kinds of surface treatment.
✔ In-House Finishing – No outsourcing delays
✔ Material Expertise – Aluminum 6061, 6063,7075, 5052, etc.
✔ Quality Assurance – Full-dimension inspection reports
✔ Fast Turnaround – 15-day standard lead time
Welcome to contact us for more details:
Email:joe168@hzhefa.com
WhatsApp:+86 13727008794
