MT-PZ ALZ44TH is a high-performance zinc-rich epoxy powder coating primer engineered to deliver superior corrosion protection for mild steel structures. This duplex system combines the benefits of cathodic protection and barrier effect, ensuring both long-term corrosion resistance and structural integrity. The formulation incorporates a highly conductive epoxy zinc-rich base that enhances cathodic protection, while built-in anticorrosive agents improve scratch resistance and maintain protection even in case of minor surface damage. MT-PZ ALZ44TH is designed to be over-coated with compatible industrial topcoats, enabling its use in multi-layer protective coating systems for harsh industrial environments.
| Property | Specification | Details |
|---|---|---|
| Chemical Type | Thermosetting Epoxy | Epoxy resin-based, zinc-rich formulation |
| Appearance | Smooth | Fine, uniform powder suitable for electrostatic application |
| Color | Grey | Approx. RAL 7012 |
| Recommended Film Thickness | 70–120 µm | Ensures optimal corrosion protection |
| Density | 2.9 ± 0.03 g/cm³ | Provides a consistent coating weight per unit area |
| Application | Electrostatic spraying | Corona method recommended; tribo application not advised |
| Storage | Dry, cool (≤30°C) | Avoid moisture and direct sunlight; maintain packaging integrity |
| Shelf Life | ≥12 months | When stored under recommended conditions |
Proper substrate preparation is critical for optimal adhesion and corrosion resistance. Pretreatment recommendations for MT-PZ ALZ44TH include:
| Substrate | Mechanical Pretreatment | Chemical Pretreatment |
|---|---|---|
| Mild Steel | Grit Blasting Sa 2.5 per ISO 8501-1, Rz 35–60 µm, Ra 6–12 µm | Degreasing & phosphating or equivalent; surface must be dry and free of contaminants |
| Cast Steel | Not recommended | Not recommended |
| Electro Zinc Steel | Not recommended | Not recommended |
| Hot-Dip Galvanized Steel | Not recommended | Not recommended |
| Zinc-Sprayed (Gas Flame/Electrical Deposition) | Not recommended | Not recommended |
Note: Surface preparation is mandatory to achieve full cathodic protection and coating performance. Avoid applying MT-PZ ALZ44TH on substrates outside these recommendations.
MT-PZ ALZ44TH is optimized for corona electrostatic powder spraying. Tribo application is not recommended due to potential adhesion issues.
Recommended Equipment Settings:
Fluidizing Air Pressure: Start at 1.5 kg/cm², then reduce to 1.0 kg/cm²
Transport Air Pressure: 0.5–0.8 kg/cm²
Voltage: 65–70 kV
Curing Guidelines:
Ensure the primer is fully cured or at least gelled before topcoat application.
Object temperature: 110–180°C
Use a convection oven; optional infra-red heaters are acceptable.
Air temperature in the oven must not exceed 180°C.
Recommended Film Thickness: 70–120 µm — critical for optimal barrier and cathodic protection.
Recycling Notes:
Conduct trials with recycling equipment before production.
Maintain a minimum of 70% new powder in the recycling mix.
Clean gun nozzles every 30 minutes to avoid clogging and ensure consistent coverage.
MT-PZ ALZ44TH provides dual corrosion protection, both through a physical barrier and cathodic activity, making it ideal for industrial steel exposed to humid, saline, or chemically aggressive environments.
Its high zinc content ensures early-stage corrosion protection, while the epoxy matrix provides strong adhesion and mechanical durability.
The powder can be integrated into multi-layer systems, over-coated with epoxy, polyester, or super-durable powder coatings, as well as compatible PU liquid topcoats, for enhanced chemical, UV, and abrasion resistance.
Zinc-rich epoxy primers like MT-PZ are approved for high-performance duplex systems and are widely used in infrastructure, offshore platforms, heavy machinery, pipelines, and structural steel frameworks.
This product contributes to sustainable coatings processes: solvent-free, low VOC emission, and high transfer efficiency minimize environmental impact while delivering superior corrosion resistance.
1. Can MT-PZ ALZ44TH be applied on galvanized or zinc-sprayed steel?
No, this primer is formulated specifically for grit-blasted mild steel. Application on galvanized or zinc-sprayed substrates may compromise adhesion and cathodic protection.
2. What is the maximum allowable over-coating interval?
When stored in a clean, dry environment, MT-PZ ALZ44TH can be over-coated within 3 weeks. Beyond this period, light surface activation may be necessary to maintain optimal intercoat adhesion.
3. Is MT-PZ ALZ44TH suitable for outdoor exposure without topcoat?
No, the primer is not UV resistant and must always be covered with a suitable topcoat for long-term outdoor protection.
4. How should recycled powder be used?
A minimum of 70% new powder must be mixed with recycled powder to ensure coating consistency. Recycling equipment trials are recommended before production.
5. Can the primer be used in high-humidity environments during application?
Humidity may affect powder flow and adhesion. Application should be performed under controlled conditions with relative humidity below 60%.
6. What are the advantages of a zinc-rich epoxy primer compared to a conventional epoxy primer?
Zinc-rich primers provide dual corrosion protection: a conductive layer enabling cathodic protection and a barrier effect. This increases corrosion resistance, particularly in scratched or damaged areas.
7. What is the recommended curing method for complex geometries?
For components with tight corners or hollow sections, use convection ovens with forced airflow to ensure uniform heat distribution and full cross-linking.
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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