Surface Finishing Processes: Protect, Enhance, Perfect

Integrated finishing solutions for CNC machined parts, sheet metal components, and 3D printed products. From corrosion protection and wear resistance to cosmetic improvements, Dakings Rapid helps deliver production-ready parts with consistent quality and fast turnaround.

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Surface Finishing Processes

Choose from a wide range of finishing options to improve corrosion resistance, surface hardness, electrical conductivity, wear performance, appearance, and product lifespan.

Surface Finishes Guide
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Name
Description
Services
Applicable Materials
As Machined
As Machined
Standard finish, surface roughness of 3.2 μm (126 μin), removes sharp edges and deburrs parts clearly.
CNC machining, Sheet metal fabrication
Metals, Plastics
Sand Blasting
Powerfully propels blast media against surfaces to remove coatings and impurities.
CNC machining, Sheet metal fabrication
Metals, Plastics
Tumbling
Tumbling
Utilizes barrel or vibratory processes with abrasives to smooth and polish the surface of parts.
CNC Machining, Sheet metal fabrication
Metals, Plastics, Glass
Electropolish
Electropolish
Electrochemical process that smoothens, polishes, and deburrs metal surfaces to a high gloss.
CNC machining
Stainless steel, Copper, Aluminum
Heat Treatment
Heat Treatment
Alters the physical (and sometimes chemical) properties of a material to achieve desired mechanical properties.
CNC machining
Metals
Alodine
Alodine
Chemical treatment process providing corrosion protection and surface preparation for paint adhesion.
CNC machining, Sheet metal fabrication
Aluminum, Aerospace Alloys
Anodizing
Anodizing
Electrochemical process that forms a durable, corrosion-resistant oxide layer on the surface of metals.
CNC Machining, Sheet metal fabrication
Aluminum
Teflon Coating
Teflon Coating
Applies a protective layer of PTFE to reduce friction and enhance corrosion resistance.
CNC machining, Sheet metal fabrication, Injection molding
Metals, Plastics
Black Oxidize
Black Oxidize
Chemical bath that creates a black oxide coating on metal to improve corrosion resistance.
CNC machining, Sheet metal fabrication
Steel, Iron
Electroless Plating
Electroless Plating
Deposition of a metal coating on substrates using an autocatalytic chemical process.
CNC machining, Injection molding, 3D printing
Metals, Plastics
Electroplating
Electroplating
Uses electric current to reduce dissolved metal cations to form a coherent metal coating.
CNC machining, Sheet metal fabrication
Metals
Painting
Painting
Application of paint for aesthetic improvements and protective coatings.
CNC machining, Sheet metal fabrication, Injection molding, 3D printing
Metals, Plastics, Wood
Passivation
Passivation
Chemical treatment to enhance the corrosion resistance of metals by removing free iron from the surface.
CNC machining, Sheet metal fabrication
Stainless Steel, Other Corrosion-resistant Alloys
Powder Coating
Powder Coating
Dry finishing process using powdered paint to provide a high-quality, durable finish.
CNC machining, Sheet metal fabrication, Injection molding
Metals, Some Plastics
Electrophoresis
Electrophoresis
Coating process using charged particles suspended in a solvent, typically for uniform finishes.
CNC machining, Sheet metal fabrication
Metals, Ceramics
Brushed Finish
Brushed Finish
Mechanical polishing that produces a unidirectional satin finish.
CNC machining, Sheet metal fabrication
Metals
SPI Finish
SPI Finish
SPI Finish standardizes surface textures on plastic parts, offering finishes from high-gloss to matte.
Injection molding
Plastics
Tesla
  • Prototyping critical structural parts for Tesla Bot (Optimus)
  • Precision machining of lightweight actuator housings
  • Heat-treated alloy components for dynamic balance
  • Rapid iteration of humanoid robot joint assemblies
Unitree Robotics
  • Mass production of high-torque motor housings
  • Lightweight limb components for quadruped agility
  • Precision gear manufacturing for joint modules
  • Surface treatment for wear resistance in dynamic motion
Agibot / Zhiyuan
  • End-to-end fabrication for humanoid skeletons
  • CNC machining of complex multi-axis joints
  • Rapid validation of dexterous hand components
  • Tolerance control within ±0.01-0.05mm for sensor integration
BTECH
  • Ruggedized shells for autonomous mobile robots (AMRs)
  • Heat sinks and thermal solutions for AI compute units
  • IP67-rated enclosures for outdoor inspection robots
  • Low-volume production for specialized robotic tools
Brose
  • High-precision micro-gearboxes for robotic actuators
  • Drive system components for automated logistics
  • Compact servo motor housing fabrication
  • Durability testing parts for continuous operation cycles
LimX Dynamics
  • High-strength aerospace aluminum for bipedal dynamics
  • Complex curvature machining for aesthetic robot shells
  • Transmission components for high-speed locomotion
  • Rapid aluminum casting for chassis structural verification
Tesla
  • Prototyping critical structural parts for Tesla Bot (Optimus)
  • Precision machining of lightweight actuator housings
  • Heat-treated alloy components for dynamic balance
  • Rapid iteration of humanoid robot joint assemblies
Unitree Robotics
  • Mass production of high-torque motor housings
  • Lightweight limb components for quadruped agility
  • Precision gear manufacturing for joint modules
  • Surface treatment for wear resistance in dynamic motion
Agibot / Zhiyuan
  • End-to-end fabrication for humanoid skeletons
  • CNC machining of complex multi-axis joints
  • Rapid validation of dexterous hand components
  • Tolerance control within ±0.01-0.05mm for sensor integration
BTECH
  • Ruggedized shells for autonomous mobile robots (AMRs)
  • Heat sinks and thermal solutions for AI compute units
  • IP67-rated enclosures for outdoor inspection robots
  • Low-volume production for specialized robotic tools
Brose
  • High-precision micro-gearboxes for robotic actuators
  • Drive system components for automated logistics
  • Compact servo motor housing fabrication
  • Durability testing parts for continuous operation cycles
LimX Dynamics
  • High-strength aerospace aluminum for bipedal dynamics
  • Complex curvature machining for aesthetic robot shells
  • Transmission components for high-speed locomotion
  • Rapid aluminum casting for chassis structural verification

Dakings Surface Finishing Capabilities

Industry Module (Vertical Stack)

Major Industries

We support customers across robotics, automation, medical devices, semiconductor equipment, optical communication, and industrial manufacturing with reliable production and finishing solutions.

Industry Module (Vertical Stack)
Technical Specifications

Technical Specifications

Key Performance Metrics

Industry Finish Type Thickness Corrosion Resistance Application Example
Robotics Anodizing Powder Coating ≥500 hours (salt spray) 60-80μm ≥1,000 hours (salt spray) ≥1,500 hours 20-50μm Robot joints Exterior shells (UV-resistant)
Medical Device Anodizing Electropolishing 10-25μm N/A (surface) ≥800 hours (salt spray) ≥1,000 hours Surgical instruments Implants (hygienic smoothness)
Automation Powder Coating Black Oxide 70-100μm 0.5-1.5μm ≥1,200 hours ≥300 hours Actuator enclosures Gear components (friction reduction)
Automotive Anodizing Powder Coating 15-30μm 50-100μm ≥700 hours (salt spray) ≥1,000 hours Aluminum wheels Chassis parts (impact resistance)
Optical Comms Polishing DLC Coating Ra ≤0.2μm 2-5μm N/A (non-corrosive) ≥500 hours Lens mounts (mirror finish) Fiber optic connectors
Semiconductor Electroplating Parylene Coating 2-10μm 1-5μm ≥300 hours (salt spray) ≥1,000 hours PCB connectors Microchips (hermetic sealing)
Perfect Your Project's Finish

Perfect Your Project's Finish

Elevate your designs with precision finishing. We offer a comprehensive range of surface finishing solutions to improve both performance and visual impact. Whether your priority is durability, functionality, or refined aesthetics, each finishing process is carefully matched to material type, color requirements, texture expectations, and budget considerations. Choose the right finish to enhance product quality, extend lifespan, and deliver a market-ready result.

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Surface Finishing service FAQs

Can you provide surface finishing for CNC machined parts?

Yes. We provide surface finishing solutions for custom CNC machined parts manufactured from aluminum, stainless steel, titanium, brass, copper, alloy steels, engineering plastics, and other materials. Surface treatments can improve corrosion resistance, wear performance, appearance, and overall product durability.

The ideal finish depends on material type, operating environment, corrosion requirements, appearance expectations, dimensional tolerances, and budget. Our engineering team can recommend the most suitable finishing process based on your application and performance goals.

Yes. Dakings Rapid provides integrated manufacturing services, including CNC machining, sheet metal fabrication, 3D printing, assembly, and surface finishing. Managing production and finishing under one roof helps reduce lead times, simplify project management, and ensure consistent quality.

We support a broad range of materials, including aluminum, stainless steel, titanium, brass, copper, alloy steel, tool steel, ABS, polycarbonate, nylon, POM, PEEK, and many other engineering plastics. Available finishing options vary depending on material compatibility and application requirements.

Yes. We support everything from single prototypes and engineering validation builds to low-volume production and full-scale manufacturing. Surface finishing services are available throughout every stage of product development and production.

Yes. We can provide RoHS and REACH-compliant finishing options for many materials and applications. Material certifications, inspection reports, and compliance documentation can be supplied upon request.

Dakings Rapid combines precision manufacturing and surface finishing under one supplier. With CNC machining, sheet metal fabrication, 3D printing, quality inspection, assembly, and finishing capabilities, we help customers streamline production, reduce sourcing complexity, and accelerate time to market.

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