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Paint treatment

Table of Contents

Definition

Powder coating is a dry finishing process that uses fine, dry pigmented polymer powder instead of liquid paint. The powder is electrostatically charged and sprayed onto workpiece surfaces, then cured under high-temperature oven to form a tough, uniform protective decorative film.

It is widely applied to metals, and also compatible with heat-resistant composites and high-temperature engineering plastics.

Working Principle

  1. Pre-treatment: Sandblasting / degreasing to clean and roughen parts for better adhesion;
  2. Electrostatic Spraying: Powder particles gain negative charge via spray gun, attracted to grounded metal workpiece;
  3. High-temperature Curing: Parts go into oven at 180–200°C, powder melts, flows and cross-links into a solid continuous coating layer.

Main Types of Powder Coatings

  1. Polyester Powder Most common outdoor grade. Excellent UV resistance, anti-fading performance. Ideal for outdoor hardware, automotive parts, outdoor equipment, aluminum profiles.
  2. Epoxy Powder Strong corrosion & chemical resistance, low cost, poor anti-UV (will chalk outdoors). Used for indoor products: cabinets, machinery frames, pipe fittings.
  3. Polyurethane Powder Super smooth, high gloss, flexible film, outstanding wear resistance. Premium choice for high-end decorative metal parts.
  4. Hybrid Epoxy-Polyester Powder Balanced cost and surface finish, only suitable for indoor use.

Key Advantages

  1. Superior Durability Thicker coating layer (30–120μm) than liquid paint, great anti-rust, scratch, impact and chemical resistance. Long service life with minimal maintenance.
  2. Eco-Friendly & Cost-Effective No solvent, zero VOC emission, meets global environmental standards. Over-sprayed powder can be recycled and reused (up to 95% material utilization rate).
  3. Uniform Consistent Finish Even coverage on complex geometry, edges, recesses and hollow structures; wide range of textures: glossy, matte, textured, hammer tone, metallic.
  4. Rich Color Options Customizable solid colors, metallic, transparent, matte, wrinkled, sand grain textures as customer requests.

Suitable Substrates

  • Metals: Aluminum alloy, steel, stainless steel, zinc die castings, iron
  • Heat-resistant composites & high temp resistant engineering plastics

Standard Production Flow

CNC Machining / Die Casting → Sandblasting / Degreasing → Electrostatic Powder Spraying → High Temp Curing → Finished Parts

Short Website Description (for product page)

Powder coating provides robust, long-lasting dry film protection for metal components. Featuring zero volatile solvents, recyclable powder materials and versatile color & texture options, it delivers superior anti-corrosion and scratch resistance for both indoor and outdoor applications.

Common Matching Surface Treatment Combinations

  1. Sandblasting + Powder Coating (matte uniform base coating)
  2. Polishing + Clear Powder Coating (bright mirror metal protection)
  3. Anodizing + Top Powder Coating (dual-layer corrosion resistance)

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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