Hansheng Automation (Dongguan) Co., Ltd. is one of the most experienced manufacturers and suppliers of aluminum surface treatment in China. If you're going to wholesale bulk cost-effective aluminum surface treatment made in China, welcome to get pricelist and quotation from our factory. Also, customized service and OEM&ODM service are available.
At Hansheng Automation, we believe that surface treatment is not just an afterthought-it is the final dimension of precision.
While many machine shops treat finishing as a separate, outsourced commodity, we view it as an integral part of the manufacturing engineering process. Leveraging our capabilities in high-end gear manufacturing and sub-micron CNC machining (up to ±0.002mm), we provide aluminum surface treatment solutions that meet the rigorous demands of the robotics, aerospace, and semiconductor industries.
Whether you require the extreme wear resistance of Hard Anodizing for a gearbox housing or the optical-grade perfection of Super Mirror Polishing, we deliver finished parts that are ready for assembly immediately upon arrival.
Our Advantage
The quality of a surface finish is dictated by the quality of the raw machining. You cannot apply a perfect finish to an imperfect substrate. This is where our core manufacturing strength becomes your advantage:
Sub-Micron Preparation: Utilizing our Seibu Wire WEDM (M50B) and Brother CNC Lathes, we achieve superior surface roughness during the machining phase. This ensures that subsequent anodizing or plating layers adhere perfectly and appear uniform.
Internal Standard Verification: We manufacture core components for Cam Indexers and Harmonic Drives in-house. The same strict surface treatment standards we apply to our own high-precision products (Standard Backlash ≤ 15 arc sec) are applied to your custom parts.
Comprehensive Solutions: From precision machining to final surface passivation, we manage the entire lifecycle of your part, eliminating the risk of dealing with multiple vendors.
Comprehensive Aluminum Surface Treatment Services
We offer a spectrum of treatments designed to enhance Wear Resistance, Corrosion Protection, Conductivity, and Aesthetics.
Functional Hard Anodizing (Type III)
For aluminum components subjected to high friction, sliding wear, or harsh environments, standard anodizing isn't enough. Our Hard Anodizing service creates a dense, ceramic-like oxide layer integrated into the substrate.
Key Benefits: Extreme hardness (up to 60-70 Rockwell C), high dielectric strength, and superior abrasion resistance.
Our Edge: Leveraging our experience with harmonic drive housings and robotic joints, we know how to control the coating thickness to prevent "tolerance stack-up" issues in precision assemblies. We offer PTFE-impregnated sealing for reduced friction coefficients.
Precision Decorative & Protective Coatings (Powder & Liquid)
Where Durability Meets Design.
Whether it's a medical device casing or an aerospace enclosure, the visual finish communicates the quality of the product.
Process: We utilize automated electrostatic spray lines for both powder and wet paint.
Our Edge: Utilizing our Large Horizontal Machining Centers implies we handle large-format structural parts. We ensure uniform coverage on complex geometries-no runs, no orange peel, and no bare spots in deep cavities. We offer custom color matching (RAL/Pantone) and specialized textures (matte, sand, gloss).
Ultra-Mirror Polishing & Chemical Brightening
For Optics, Fluids, and Clean Rooms.
When surface roughness (Ra) matters more than anything else.
Process: Through a combination of mechanical polishing and Electrolytic Polishing, we remove microscopic peaks on the metal surface.
Our Edge: This service pairs perfectly with our Ultra-Precision Machining (±0.002mm) capability. We can take a milled part and bring it to a near-optical finish, significantly reducing fluid friction for hydraulic manifolds or ensuring zero-particle retention for medical instruments.
Surface Engineering & Pre-Treatment (Bead Blasting/Passivation)
The Foundation of Adhesion.
The secret to a long-lasting finish is the preparation.
Process: We offer controlled bead blasting (glass, ceramic, aluminum oxide) to create uniform matte textures or specific surface profiles (Rz) to enhance coating adhesion.
Chemical Conversion (Chromate/Alodine): A crucial step for aerospace parts requiring electrical conductivity while maintaining corrosion resistance.
How to Specify Your Finish
Not sure which process suits your engineering requirements? Use this guide to navigate our capabilities.
|
Process Type |
Core Characteristic |
Performance Boost |
Typical Applications |
|
Hard Anodizing (Type III) |
Thick, ceramic-hard layer |
Extreme Wear Resistance, Electrical Insulation |
Harmonic Drive Shells, CAM Indexer housings, Robotics, Pistons |
|
Standard Anodizing (Type II) |
Porous, dye-able layer |
Corrosion Resistance, Cosmetic Color |
Automation Brackets, Electronic Enclosures, Consumer Goods |
|
Electrolytic Polishing |
Material removal (leveling) |
Ultra-low Ra, Cleanability, Reflectivity |
Medical Devices, Optical Mounts, Fluid Control Systems |
|
Chemical Conversion |
Conductive film |
Corrosion Shield, Paint Base, Conductivity |
Aerospace Avionics, grounding points, internal chassis |
|
Precision Powder Coating |
Polymer resin cure |
Impact Resistance, Weatherability, Aesthetics |
Heavy Machinery Covers, Outdoor Equipment, Structural Frames |
Industry Solutions
Aerospace & Defense
Requirement: Lightweight, high-strength, zero-failure tolerance.
Our Solution: We provide MIL-SPEC compliant hard anodizing and chemical conversion coatings. Our rigorous QA (using our Gear Inspection Machines and CMMs) ensures that even complex thin-walled aerospace parts maintain their structural integrity after processing.
Medical & Life Sciences
Requirement: Biocompatibility, sterilization resistance, and easy cleaning.
Our Solution: We offer validated passivation and electropolishing processes that remove free iron and surface contaminants, ensuring parts can withstand repeated autoclaving without degrading.
High-End Automation & Robotics
Requirement: Low friction and tight assembly fits.
Our Solution: This is our home turf. We treat robot arms, joint housings, and slide rails with low-friction hard coatings that extend the lifecycle of the automation equipment, ensuring the ±15 arc sec accuracy of your system is maintained over millions of cycles.
FAQ
Q: How do you manage "Tolerance Stack-up" on parts with H7/h6 fits or precision bearing bores?
A: Unlike standard finishing shops, we calculate the growth per surface (penetration vs. build-up) before the part enters the tank. For Hard Anodizing, the oxide layer typically builds up 50% and penetrates 50%.
For critical features like bearing bores or gear teeth (where our ≤5 arc sec backlash standard applies), we utilize precision masking plugs or calculate the pre-plating machining dimensions to accommodate the coating thickness. We strongly recommend noting critical toleranced dimensions on your drawings so we can customize the etching duration to hold the final spec.
Q: Will Hard Anodizing degrade the surface roughness (Ra) of my "Ultra-Precision" (±0.002mm) machined parts?
A: It can, if not controlled. Hard anodizing naturally increases micro-roughness because the oxide growth is columnar. For parts requiring an ultra-smooth finish (like dynamic sealing surfaces or air bearing ways), we recommend a post-process lapping or honing operation, or starting with our Electrolytic Polishing to lower the initial Ra significantly before anodizing. We can consult with you to determine the optimal "Machined Ra" vs. "Finished Ra" ratio.
Q: How precise is your masking capability for complex geometries?
A: We do not rely solely on hand-taping. For high-volume or complex components (such as valve bodies or electronics chassis with multiple grounding points), we design and fabricate custom CNC-machined masking fixtures and silicone molds in-house. This ensures that the transition line between the coated and uncoated surface is sharp, repeatable, and positioned within strict tolerances, preventing leakage or electrical connectivity issues.
Q: My parts are made of 7000-series aluminum or Cast Aluminum. Does this affect the process?
A: Yes. 7000-series (high zinc) and Castings (high silicon) are more difficult to treat than standard 6000-series. They are prone to burning or uneven coating if processed in standard lines. We have specific rectifier ramp protocols and electrolyte additives tailored for these difficult alloys to prevent dissolution and ensure a uniform, hard coat, even on porous cast surfaces.
Q: What is the risk of re-working an anodized part?
A: "Stripping" an anodized coating chemically removes material-both the oxide layer and a small amount of the raw substrate. This will result in dimensional loss (often 0.01mm - 0.05mm depending on original thickness).
Because we operate under a "Precision First" philosophy, we generally advise against stripping critical tolerance parts unless there is surplus material allowance. Our focus is on Process Failure Mode Effects Analysis (PFMEA) to ensure the process is right the first time, protecting your high-value machined workpieces.
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