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Paint treatment

Table of Contents

Definition

Polishing is a precision mechanical surface finishing process. It eliminates surface imperfections, machining lines, scratches and uneven textures via abrasive grinding and buffing, producing smooth, satin or highly reflective metallic surfaces.

This process is widely applied to aluminum, stainless steel, brass, copper, titanium alloys and rigid composite parts. It can also be paired with follow-up treatments including anodizing, powder coating and electroplating.

Main Types & Working Principles

Mechanical Polishing

Workpieces are processed step by step using progressively finer abrasives, grinding wheels and buffing compounds.

  • Coarse grinding: Remove burrs, deep machining marks and surface pits
  • Medium grinding: Erase rough scratches left by coarse abrasives
  • Fine buffing: Generate soft satin texture or flawless mirror finish

Electrolytic Polishing (Electro-Polishing)

An electrochemical finishing method. Parts serve as anodes in specialized electrolyte under controlled electric current. Micro protrusions on the metal surface dissolve preferentially, delivering ultra-bright mirror gloss and better corrosion resistance. It is the top choice for stainless steel products.

Chemical Polishing

Parts are soaked in polishing solution to level tiny surface irregularities without electricity supply. It is cost-efficient for mass small-sized components, though its gloss level is inferior to electro-polishing.

Common Surface Finishes

  1. Satin / Brushed Polishing Uniform fine linear texture with low reflectivity and fingerprint resistance, frequently used for electronic enclosures.
  2. Mirror Polishing Ultra-high reflectivity with clear mirror-like effect, ideal for premium metal logos, decorative hardware and sanitary fittings.
  3. Fine Matte Polishing Smooth non-gloss surface free of visible scratches, delivering an understated high-end appearance.

Core Advantages

  1. Removes surface defects such as machining streaks, oxidation stains and micro burrs
  2. Elevates visual appeal with clean, premium metallic texture
  3. Enhances corrosion resistance: smooth surfaces accumulate less contaminants; electro-polishing forms a dense passive protective film
  4. Reduces friction coefficient, lowering abrasion for moving mechanical components
  5. Optimizes bonding performance for subsequent anodizing, coating and electroplating

Compatible Materials

  • Metals: Stainless steel, aluminum alloy, brass, copper, zinc alloy, titanium
  • Hard composites, high-temperature resistant rigid engineering plastics

Standard Production Workflows

  1. CNC Machining / Die Casting → Coarse Polishing → Fine Polishing
  2. Polishing + Sandblasting: Mixed satin decorative texture
  3. Polishing → Anodizing / Clear Powder Coating: Prevent bright metal surfaces from oxidation
  4. Stainless Steel Workpieces → Electro-Polishing

Surface treatment resources

Frequently Asked Questions

  To shorten the delivery cycle of CNC workpieces, we start with the documents submitted by customers. Please provide complete and clear 2D drawings, 3D models, dimensional tolerances, surface requirements, and processing specifications, and specify special materials, surface treatments, and assembly standards. Avoid incomplete drawings, ambiguous markings, and version confusion.
Complete documents enable direct programming, order splitting, and production scheduling, cutting down repeated confirmation and supplementary work. Customers are also advised to finalize order quantity, delivery schedule, and special requirements in advance. Eliminating repeated communication and rework risks at the source accelerates the whole process and effectively shortens the overall lead time.

  With 12 years of expertise in CNC machining, YUEYI stands out from other manufacturers and middlemen. Our factory covers an area of 4,000 mu and is equipped with over 100 processing machines. We achieve a machining precision up to 0.001 mm, capable of producing high-precision components. Backed by standardized production management, our on-time delivery rate reaches 98%. As a direct manufacturer with full in-house production capacity, we control every production link without outsourcing. We deliver consistent quality, outstanding precision and reliable lead time, making us your trustworthy partner for CNC precision machining.

  Fast delivery is one of our key strengths. For 3D printing orders, we support delivery within 3 days, ideal for rapid prototyping and urgent sample requests. For regular CNC machining projects, the standard lead time is around 3 weeks.
We manage the whole process in-house, from drawing review and process planning to production, quality inspection, and shipment, with no intermediate links. Equipped with complete facilities and an experienced team, we reliably fulfill both urgent sample orders and mass production. We guarantee stable lead time and consistent quality to keep your projects on track.

  We offer a full range of surface treatments with rich color options. Our services include anodizing, powder coating, spray painting, electroplating, wire drawing, sandblasting, and polishing. Anodizing features various colors and strong anti-corrosion performance for aluminum parts. Powder coating and spray painting come with extensive color selections and durable coatings. Electroplating enhances luster and rust resistance. Wire drawing creates fine linear textures, while sandblasting delivers a matte finish. Polishing achieves a bright and smooth surface. All finishes can be customized in colors and styles to match your application needs.

  Yes, we fully provide complete material certificates and relevant test reports for all CNC-machined parts. All raw materials are sourced from qualified suppliers with authentic documentation. We can offer material certifications, dimension inspection reports, and quality test records upon request. Every product is strictly inspected before delivery. These official documents fully guarantee material compliance and product quality, supporting your quality audit and project requirements.

  We take strict quality control measures in advance to prevent non-conforming products. Every workpiece is fully inspected dimensionally and visually during and after production to ensure full compliance with design drawings and specifications.
In the rare case of non-compliant items, we will take immediate responsibility. We will promptly confirm the issues with you, then arrange free rework or remanufacturing as required. All related costs will be borne by us. We will also analyze the root cause to optimize our processes and avoid similar problems recurring. Our goal is to deliver qualified products steadily and safeguard your project progress.

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