Powder coating primer
We are a manufacturer based in China, specializing in high-quality Powder coating primer for industrial clients worldwide. Technical support and custom formulation available.
Category：powder Coating | Brand：MT
Introduction
MT-Active is a zinc-free powder coating primer developed to enhance corrosion protection on mild steel and other suitable metal substrates. This thermosetting epoxy-polyester primer contains active anticorrosive pigments designed to promote substrate passivation and improve corrosion protection compared with non-active primer systems under appropriate application conditions.
Designed as a primer layer in a powder coating system, MT-Active can be used with a compatible topcoat to provide a protective coating system. Overall performance depends on substrate preparation, pretreatment, film thickness, curing conditions, and topcoat compatibility.
Powder Properties
| Property | Specification |
|---|---|
| Product Name | MT-Active Powder Coating Primer |
| Chemical Type | Thermosetting epoxy-polyester |
| Appearance | Smooth |
| Gloss Level (60°) | 50–60 gloss units |
| Color | Grey |
| Recommended Film Thickness | 60–80 μm |
| Density | 1.65–1.70 g/cm³ |
| Application Method | Electrostatic spraying |
| Storage Conditions | Store in a cool, dry environment at or below 30°C |
| Shelf Life | At least 12 months from the production date under recommended storage conditions |
Mechanical Test Results
| Test Item | Test Standard | Primer Result | Coating System Result |
|---|---|---|---|
| Flexibility (Cylindrical Mandrel) | ASTM D522-93a | Pass at 3 mm | Pass at 10 mm |
| Adhesion | ASTM D3359-97, 2 mm crosshatch | Class 0 | Class 0 |
| Erichsen Cupping | ASTM 643-84 (as supplied) | Pass at 5 mm | Pass at 4 mm |
| Impact Resistance | ASTM D2794 | Pass at 0.4 kg·m | Pass at 0.3 kg·m |
The reported results distinguish between the primer alone and the complete coating system. Confirm the original test conditions and report before using these values as guaranteed product specifications.
Substrate Pretreatment
Surface preparation should be selected according to the substrate material, surface condition, and required corrosion protection. Proper cleaning and pretreatment are essential for coating adhesion and long-term performance.
| Substrate | Mechanical Pretreatment | Chemical Pretreatment |
|---|---|---|
| Mild Steel | Abrasive blasting to Sa 2.5 in accordance with EN ISO 8501-1. Reported roughness: Rz 42–84 μm; Ra 6–12 μm. | Degreasing and phosphating, or an equivalent treatment, followed by passivation, deionized-water rinsing, and drying. |
| Cast Steel | Abrasive blasting to Sa 2.5 in accordance with EN ISO 8501-1. Reported roughness: Rz 42–84 μm; Ra 6–12 μm. | Degreasing and phosphating, or an equivalent treatment, followed by passivation, deionized-water rinsing, and drying. |
| Electro-Zinc-Coated Steel | Sweep blasting, limiting zinc-layer thickness reduction to approximately 5–10 μm depending on the initial coating thickness. | Degreasing and phosphating, or an equivalent treatment, followed by passivation and rinsing as appropriate for the process. |
| Hot-Dip Galvanized Steel | Sweep blasting, limiting zinc-layer thickness reduction to approximately 5–10 μm depending on the initial coating thickness. | Degreasing and phosphating or chromating, followed by passivation as appropriate for the process. |
| Flame-Sprayed or Electrodeposited Coatings (source wording requires confirmation) | The source specifies blasting to Sa 3 in accordance with EN ISO 8501-1, with reported roughness of Rz 42–84 μm and Ra 6–12 μm. | Listed as prohibited in the source; confirm the intended substrate and pretreatment restriction before application. |
Pretreatment recommendations should be validated for the actual substrate and coating system. Avoid excessive blasting on galvanized surfaces, as damage to the zinc layer may reduce corrosion protection.
Looking for a zinc-free anticorrosive powder coating primer? Contact our team for technical data, coating system compatibility, samples, and substrate-specific pretreatment recommendations.
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