Zinc-rich primer powder coatings are based on pure polyester resin and use ultra-fine zinc powder as the main anti-corrosion pigment, preventing the formation of zinc salts. This zinc-rich primer offers excellent cathodic protection, superior corrosion resistance, strong adhesion, good impact and abrasion resistance, and high adhesion. It exhibits excellent adhesion to sandblasted steel. Customized zinc-rich primers with different weather resistance requirements can be manufactured according to customer specifications.
Zinc-rich primer powder coatings are suitable for various substrates, including shot-blasted steel and hot-dip galvanized substrates. They are used for corrosion protection of steel surfaces in demanding outdoor applications such as fitness trails, steel structures, and ships.
| Item | Specification |
|---|---|
| Chemical Type | Pure Polyester Type |
| Appearance | Gray |
| Curing Condition (Workpiece Temperature) | 200℃ / 10min; improper curing may cause loss of color, gloss, and coating performance |
| Gloss | Depends on specific product |
| Storage Condition | Sealed and stored in a dry, cool place below 30℃ |
| Shelf Life | 6 months (<30℃), 12 months (<25℃) |
| Packaging Specification | 25kg/carton |
Note: Substrate and pretreatment: Mechanical performance tests were conducted using 0.6mm thick degreased cold-rolled steel plates; corrosion and aging resistance tests were conducted using 0.6mm thick zinc phosphated steel plates or chromated aluminum plates.
• Film thickness: 60-80μm • Curing conditions: 200℃/10min (workpiece temperature)
| Item | Index | Test Standard |
|---|---|---|
| Dry Adhesion | Passed, result 5B | ASTM D3359 |
| Impact Resistance | Passed, impact force 2.5 NM (fluorocarbon allows cracking but no peeling) | ASTM D2794 |
| Boiling Water Adhesion | Passed, result Grade 0 | Qualicoat-2.16 |
| Dry Film Hardness | Passed, minimum H grade | ASTM D3363 |
| Heat and Humidity Resistance | Passed, 100–2000h | ASTM D2247 |
| Accelerated Aging Test | Passed, 1000–2000h | ISO 11341 |
| Outdoor Weather Resistance | Passed, 1–5 years exposure in Florida (facing south at 45°) | AAMA2603 |
| Acidic Salt Spray | Passed, 500–1500h | ISO 9227 |
| Neutral Salt Spray | Passed, 1000–2000h | ASTM B117 |
Zinc-rich primer powder coating can be applied using manual or automatic spraying equipment, ensuring a clean air supply.
Atomizing air pressure: ~0.7 bar
Primary air pressure: ~0.7 bar
Recommended voltage: 40–90 kV
During spraying, ensure that ventilation and dust collection systems are functioning properly, and that personnel take appropriate protective measures and wear suitable protective equipment. For more detailed information, please refer to the safety data sheet for the corresponding product.
Powder coatings can be categorized by resin system (epoxy, polyester, hybrid, polyurethane), appearance (smooth, texture, hammer, metallic, pearlescent), or performance level (anti-corrosion, heat-resistant, UV-resistant, architectural grade, automotive grade).
Powder coatings offer thousands of colors in gloss, matte, satin, metallic, candy, texture, wrinkle, hammer tone, wood grain, fluorescent, and other custom effects. Special powders can create soft-touch, anti-scratch, anti-fingerprint, or anti-graffiti surfaces.
The process generally includes surface pretreatment (degreasing, phosphating, chromating, sandblasting), drying, electrostatic spraying, curing in an oven, and cooling. A well-controlled pretreatment and curing process ensures strong adhesion and long service life.
Powder coatings are environmentally friendly, solvent-free, and produce minimal waste. They offer excellent corrosion resistance, weather durability, mechanical strength, and uniform film appearance. The coating is tough, impact-resistant, scratch-resistant, and has a long lifespan.
Powder coatings are widely used in appliances, aluminum profiles, architectural components, automotive parts, bicycles, furniture, outdoor equipment, machinery, electrical cabinets, pipeline systems, and general industrial and consumer goods.
Powder coating is a dry finishing technology where finely ground powder is electrostatically sprayed onto a metal or non-metal surface and then cured at high temperature. After curing, the powder melts into a continuous, durable, and decorative coating layer.
Powder coating protects the substrate from corrosion, weathering, chemical attack, and mechanical wear. It also provides decorative appearance with rich colors, gloss levels, textures, and special effects.
In many industrial applications, powder coating outperforms liquid paint. It forms a thicker and tougher coating, resists corrosion and chemicals better, and does not contain VOCs. It also provides excellent consistency and cost-effective mass production.
It is called powder coating because the coating material is a solid powder instead of a liquid paint. The coating is formed by melting and curing powder particles under heat.
Powder coatings include several families depending on resin chemistry:
• Epoxy powders
• Polyester powders
• Epoxy-polyester hybrid powders
• Polyurethane powders
• Acrylic powders
• Fluorocarbon (PVDF) powders
Each type has its own performance features such as corrosion resistance, UV resistance, chemical resistance, outdoor durability, or decorative properties.
Powder coatings are based on thermoset or thermoplastic resins combined with pigments, curing agents, fillers, additives, and in some cases metallic or effect particles. Common substrates include steel, aluminum, galvanized metal, MDF, and certain heat-resistant plastics.
The lifespan depends on powder type, film thickness, application method, pretreatment, and service environment. Indoor coatings can last more than 10–20 years. High-grade outdoor polyester or fluorocarbon powders can last 15–25 years or longer under UV exposure.
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