--- id: "surface-treatment-en" title: "Surface Treatment Services | Polishing, Anodizing & Laser Marking | Zhongde Precision" description: "Zhongde Precision provides polishing, deburring, coating, anodizing, laser marking, screen printing and pad printing services for precision metal parts." source: "/en/surface-treatment" language: "en" generated: true --- # Surface Treatment Polishing · Coating / Anodizing · Laser Marking We provide one-stop surface treatment solutions for precision metal parts, improving appearance, corrosion resistance, wear resistance, insulation and product traceability. - Polishing & Deburring - Coating / Anodizing Protection - Laser Marking & Identification ## Key Figures ### Core Surface Processes 3 ### Polishing Machines 11 ### Coating & Anodizing-Related Machines 28 ### Polishing · Coating/Anodizing · Marking One-Stop ## 01. What Is Surface Treatment? Surface treatment combines polishing, grinding, blasting, coating, anodizing and laser marking to improve the appearance and performance of precision parts. These processes enhance corrosion resistance, wear resistance, insulation, cleanliness and traceability. The appropriate process is selected according to the material, dimensional tolerances, appearance requirements and service environment. ### Capabilities and Engineering Points #### Polishing & Finishing Deburring, edge rounding, satin and mirror finishes #### Coating / Anodizing Corrosion resistance, wear resistance, insulation and color #### Laser Marking Characters, logos, QR codes and traceability marks ## 02. Surface Treatment Processes Our in-house capabilities cover polishing and finishing, coating and anodizing, and laser marking and printing for appearance, protection, functionality and traceability. ### Engineering Items #### 01. Polishing & Finishing Vibratory, precision, high-speed rotary, plasma and robotic polishing improve burrs, edges, gloss and overall surface consistency. Precision finishing workshop · 1,008 m² POLISHING & FINISHING ##### Key Figures ###### Finishing machines 11 ###### Vibratory units 4 ###### High-speed units 6 ###### Polishing robots 2 ##### Capabilities - Vibratory finishing - Precision polishing - High-speed finishing - Plasma polishing - Robotic polishing - Deburring #### 02. Coating / Anodizing Cleaning, masking, electrostatic dust removal, robotic spraying, curing and anodizing support cosmetic and functional requirements. In-house coating and anodizing production COATING & ANODIZING ##### Key Figures ###### Coating robots 2 ###### Continuous oven 1 ###### Anodizing machines 28 ###### Anodizing area 1,008 m² ##### Capabilities - Pretreatment - Masking - Dust removal - Robotic spraying - Drying and curing - Anodizing - Film inspection - Visual inspection #### 03. Laser Marking & Printing Laser marking, screen printing, pad printing, serial numbers, QR codes and batch marks support identification and traceability. Marking and printing linked with packing inspection LASER MARKING & PRINTING ##### Key Figures ###### Printing machines 3 ###### Permanent marking Laser ###### Traceability QR ###### Visual check 100% ##### Capabilities - Laser marking - Screen printing - Pad printing - Serial numbers - QR codes - Batch traceability ## 03. Core Equipment & Production Lines Our in-house equipment covers vibratory finishing, robotic polishing, precision finishing, automatic coating, anodizing and laser marking, with integrated process control and inspection. ### Engineering Items #### 01. Vibratory Finishing Equipment Continuous interaction between parts and finishing media supports batch deburring, edge rounding and surface equalization. VIBRATORY FINISHING 4 units ##### Key Features - Batch deburring - Edge rounding - Surface equalization #### 02. Robotic Polishing Equipment Controlled robot paths and multiple polishing tools provide repeatable finishing for complex curves and cosmetic surfaces. ROBOT POLISHING 2 units ##### Key Features - Complex surfaces - Path control - Batch consistency #### 03. Precision / Plasma Finishing Precision, plasma and high-speed rotary finishing improve fine burrs, gloss and surface roughness. PRECISION & PLASMA FINISHING 1 + 6 units ##### Key Features - Precision finishing - Plasma finishing - High-speed finishing #### 04. Automatic Coating Line The coating line connects cleaning, masking, dust removal, robotic spraying, curing and visual inspection. AUTOMATIC COATING 2 units ##### Key Features - Robotic spraying - Continuous curing - Film control #### 05. Anodizing Production Line Automated transfer and process tanks support pretreatment, anodizing, cleaning, sealing and final inspection. ANODIZING LINE 28 units ##### Key Features - Automated transfer - Anodizing and sealing - Process inspection #### 06. Laser Marking Equipment Laser workstations produce text, logos, serial numbers, QR codes and batch information for permanent identification. LASER MARKING 4 units ##### Key Features - Logos and text - Serial numbers - QR codes ## 04. Applicable Parts & Product Types Our surface treatment capabilities support liquid cooling systems, robotics, optical transceivers, electronics and industrial parts with cosmetic, protective, functional and identification requirements. ### Engineering Items #### AI Liquid Cooling Parts Cold plates, flow-channel plates, covers and thermal structures requiring cosmetic and functional surfaces. AI LIQUID COOLING ##### Manufacturing Processes - Precision finishing - Anodizing - Laser marking #### Humanoid Robot Joints Joint housings, mounting structures and actuator parts requiring controlled cosmetic surfaces. HUMANOID ROBOT ##### Manufacturing Processes - Robotic polishing - Anodizing - Coating #### Optical Transceiver Parts High-density housings, heat spreaders and structural parts requiring protection and identification. OPTICAL TRANSCEIVER ##### Manufacturing Processes - Precision finishing - Black anodizing - Laser marking #### Aluminum Enclosures Controller, instrument and electronic housings requiring color, protection and printed markings. ALUMINUM ENCLOSURE ##### Manufacturing Processes - Color anodizing - Spray coating - Screen printing #### Electronic Structures Equipment frames, mounting bases and internal structures requiring protection and traceability. ELECTRONIC STRUCTURE ##### Manufacturing Processes - Black anodizing - Protective coating - QR codes #### Mold & Industrial Parts Molds, fixtures, locating bases and industrial components requiring deburring and finishing. MOLD & INDUSTRIAL PARTS ##### Manufacturing Processes - Deburring - Precision finishing - Laser marking ## 05. Critical Quality & Engineering Controls Surface treatment quality depends on the base material, pretreatment, masking, fixture design, film thickness, color and post-treatment conditions. Critical requirements are controlled through engineering review, first-article approval and production inspection. ### Engineering Control Priorities #### 01. Material & Pretreatment Cleaning, degreasing, deburring and activation methods are selected according to material and appearance requirements. ##### Key Items - Material review - Degreasing - Pretreatment #### 02. Surface & Edge Condition Burrs, roughness, gloss, texture, chamfers and edge rounding are controlled without excessive material removal. ##### Key Items - Roughness - Gloss - Edge condition #### 03. Film Thickness & Dimensions The effect of coating growth on holes, slots, threads, sealing surfaces and assembly fits is evaluated. ##### Key Items - Film thickness - Compensation - Fit surfaces #### 04. Color & Appearance Consistency Color samples, limit samples and first-article approval are used to control cosmetic consistency. ##### Key Items - Color difference - Limit samples - First article #### 05. Masking & Fixture Design Masking and fixture plans protect functional surfaces, electrical contacts and untreated areas. ##### Key Items - Thread protection - Contact points - Datum surfaces #### 06. Performance & Traceability Required performance is verified and process batches, inspection results and identification records are retained. ##### Key Items - Adhesion - Corrosion resistance - Traceability ### Key Inspection Items by Process #### Polishing & Finishing POLISHING & FINISHING ##### Engineering Items - Burr and edge condition - Surface roughness - Gloss and grain direction - Scratches, dents and deformation #### Coating COATING ##### Engineering Items - Film thickness and color - Adhesion - Particles, sagging and orange peel - Missed areas and masking edges #### Anodizing ANODIZING ##### Engineering Items - Anodic film thickness - Color and batch consistency - Burn marks, stains and rack marks - Sealing and dimensional change #### Marking & Printing MARKING & PRINTING ##### Engineering Items - Position and artwork completeness - Clarity and contrast - Adhesion and rub resistance - QR-code readability ### Acceptance Criteria Final acceptance criteria follow customer drawings, color samples, limit samples and technical specifications. Parts with critical cosmetic or performance requirements should be approved through samples and first articles before mass production. ## 06. Material & Surface Treatment Selection Surface treatment should be selected according to the base material, appearance requirements, service environment, dimensional tolerances and identification needs. The following guide supports initial selection; the final process is determined through drawing review and sample validation. Different materials have different levels of compatibility with finishing, coating, anodizing and marking processes. - Material Note: Results may vary with alloy grade, heat-treatment condition, casting defects and the original surface condition. ### Statuses Review Required - Recommended: Recommended - Not Recommended: Normally Unsuitable ### Material #### Aluminum Alloys 6061 / 6063 / 7075, etc. ##### Compatibility - recommended - recommended - recommended - recommended #### Zinc Alloys Die-cast structural parts ##### Compatibility - recommended - recommended - notRecommended - review #### Stainless Steel SUS303 / 304 / 316, etc. ##### Compatibility - recommended - review - notRecommended - recommended #### Carbon Steel Mechanical and industrial parts ##### Compatibility - review - recommended - notRecommended - recommended #### Engineering Plastics ABS / PC / PBT, etc. ##### Compatibility - notRecommended - review - notRecommended - review ### Select by Product Requirement #### 01. Appearance & Gloss Improve texture, gloss, color and the overall cosmetic quality of the product. ##### Manufacturing Processes - Precision finishing - Robotic polishing - Color anodizing - Coating #### 02. Corrosion Protection Improve protection in humid, salt-spray and general industrial environments. ##### Manufacturing Processes - Anodizing - Protective coating - Sealing #### 03. Insulation & Function Support insulation, protection and controlled conductive areas on precision parts. ##### Manufacturing Processes - Anodizing - Insulating coating - Local masking #### 04. Color & Branding Add product colors, logos, operating marks and brand identification. ##### Manufacturing Processes - Color anodizing - Coating - Screen printing - Pad printing #### 05. Dimension & Assembly Protect holes, slots, threads, sealing surfaces and critical assembly fits. ##### Manufacturing Processes - Film compensation - Hole masking - Thread protection #### 06. Permanent Traceability Support product identification, production-batch management and quality traceability. ##### Manufacturing Processes - Laser marking - QR codes - Serial numbers - Batch codes ### Selection Note The final process should confirm material grade, original surface condition, critical dimensions, service environment, approved color samples and required performance testing. Sample validation and first-article approval are recommended for critical cosmetic or functional requirements. ## RFQ Requirements and FAQ ### 07. Information Required for Quotation Complete RFQ information supports a more accurate review of process feasibility, appearance standards, dimensional compensation, lead time and pricing. #### Engineering Items ##### 01. 2D Drawings - Detail: PDF / DWG ##### 02. 3D Models - Detail: STEP / IGES ##### 03. Material & Condition - Detail: Grade / heat treatment / blank ##### 04. Quantity & Phase - Detail: Prototype / pilot / production ##### 05. Surface Specification - Detail: Process / color / gloss ##### 06. Film & Dimensions - Detail: Thickness / tolerance / allowance ##### 07. Masking Areas - Detail: Threads / seals / contacts ##### 08. Cosmetic Criteria - Detail: Color / limit samples / surfaces ##### 09. Inspection & Testing - Detail: Adhesion / salt spray / roughness ##### 10. Packing & Traceability - Detail: Protection / batch / labels ### 08. Common Engineering Questions #### Engineering Items ##### 01. How should anodizing, coating and polishing be selected? Anodizing is commonly selected for aluminum corrosion resistance, insulation and color. Coating supports a wider range of materials, colors and protective requirements. Polishing and finishing are used mainly for deburring, roughness, gloss and edge control. Final selection depends on the material, environment, appearance class and dimensional requirements. ##### 02. Will surface treatment change holes, threads and assembly fits? Yes. Anodic films and coatings add thickness to treated surfaces. Critical holes, slots, threads, sealing surfaces and mating areas may require machining allowance, masking or post-treatment finishing. Compensation should be confirmed according to the selected process and target thickness. ##### 03. Why can color vary between batches using the same specification? Material grade, heat-treatment condition, starting roughness, pretreatment, film thickness, bath condition and curing parameters can all affect color. Critical cosmetic parts should use approved color samples, limit samples and first-article approval. ##### 04. Can polishing affect dimensions and edge geometry? Yes. Vibratory finishing, robotic polishing and precision finishing all remove material. Thin walls, sharp edges, sealing surfaces and critical fits require controlled time, media, pressure and polishing paths, together with clearly defined protected areas. ##### 05. How are laser marks and printed codes kept clear and traceable? The material, treated surface, marking position, character size, contrast, QR-code grade and rub-resistance requirement must be confirmed. Samples should be approved before production, followed by visual or scanning verification.