MT-PZ ALZ55N is a high-performance, zinc-rich epoxy powder primer engineered to deliver superior corrosion protection for mild steel in demanding industrial environments. The primer combines both cathodic protection and a physical barrier effect, creating a robust duplex system that safeguards steel against corrosion, chemical exposure, and mechanical damage.
Formulated with a high zinc content and reinforced with anticorrosive additives, MT-PZ ALZ55N provides conductivity that enhances cathodic protection while simultaneously improving protection in areas prone to scratches or mechanical impact. This primer is intended as a base layer for multi-coat systems, offering long-term durability when paired with compatible topcoats, including epoxy, polyester, super-durable polyester powders, and approved polyurethane liquids.
Designed for critical industrial applications, MT-PZ ALZ55N ensures structural integrity, prolonged service life, and reliable corrosion resistance in moderate to aggressive environments.
| Property | Specification | Notes |
|---|---|---|
| Chemical Type | Thermosetting Epoxy | Zinc-rich formulation for cathodic protection |
| Appearance | Smooth, free-flowing powder | Ensures uniform application |
| Color | Grey | RAL7012 approximate |
| Recommended Film Thickness | 70–120 µm | Optimal balance between protection and coverage |
| Density | 2.9 ± 0.03 g/cm³ | High density ensures effective barrier |
| Application Method | Corona Electrostatic Spray | Tribo application not recommended |
| Storage Conditions | Dry, cool ≤30°C | Prevents moisture absorption and caking |
| Shelf Life | ≥12 months | From production date under proper storage |
The performance of MT-PZ ALZ55N is highly dependent on substrate preparation. Proper surface treatment ensures excellent adhesion, optimal edge coverage, and maximum corrosion protection.
Mild Steel: Grit or shot blasting to Sa 2.5 in accordance with ISO 8501-1. Surface roughness Rz 35–60 µm / Ra 6–12 µm.
Cast Steel / Electro Zinc Steel: Not recommended due to inconsistent primer adhesion.
Hot-Dip Galvanized Steel or Zinc-Sprayed Surfaces: Use alternative primers; MT-PZ ALZ55N is not designed for these substrates.
Best Practices:
Ensure all surfaces are clean, oil-free, and dry prior to coating.
Remove loose dust and contaminants from blasting before applying the primer.
Spraying: Use corona electrostatic spraying. Tribo application is not recommended due to inconsistent film formation.
Fluidizing Air Pressure: 1.5 kg/cm² initially, then reduce to 1 kg/cm².
Transport Air Pressure: 0.5–0.8 kg/cm².
Voltage: Recommended 65–70 kV for consistent powder deposition.
Curing: Use convection ovens or infrared heaters; object temperature must remain between 110°C and 180°C. Ensure primer is fully gelled before applying topcoat.
Film Thickness: Maintain 70–120 µm for optimal corrosion resistance.
Recycling: Minimum of 70% new powder should be used. Clean gun nozzles every 30 minutes to prevent buildup and ensure uniform coating.
Superior Corrosion Protection: Zinc-rich epoxy ensures galvanic protection for exposed steel areas, enhancing durability even in scratched areas.
Excellent Barrier Properties: Forms a dense, continuous film that resists water, salts, and industrial pollutants.
Edge Coverage: Designed for maximum coverage in corners, welds, and recesses.
Mechanical Strength: Resistant to impact, abrasion, and handling during assembly or transportation.
Environmental Sustainability: Solvent-free, minimal VOC emissions, and recyclable powder.
Over-Coating Flexibility: Compatible with a wide range of epoxy, polyester, and polyurethane topcoats, providing adaptability to multiple industrial and architectural applications.
MT-PZ ALZ55N is suitable for a variety of sectors and components where steel corrosion resistance is critical:
Industrial Machinery: Frames, supports, and equipment housings exposed to harsh environments.
Infrastructure & Civil Projects: Bridges, pipelines, guardrails, fencing, and storage racks.
Architectural Steel: Window frames, gates, metal panels, and structural supports.
Transportation Equipment: Agricultural, construction, and heavy machinery.
Marine & Coastal Structures: Steel exposed to high-humidity or saline environments when part of a duplex coating system.
Powder coatings vary by resin system, finish, and performance:
Resin Systems: Epoxy, polyester, hybrid, polyurethane.
Appearance Options: Smooth, textured, hammer, metallic, pearlescent, wood-grain, wrinkle, or special effects.
Performance Levels: Anti-corrosion, UV-resistant, heat-resistant, automotive-grade, architectural-grade.
Colour & Effects:
Thousands of gloss, satin, matte, metallic, candy, and special effect options are available.
Special powders can provide soft-touch, anti-scratch, anti-fingerprint, or anti-graffiti properties.
Process Highlights:
Surface pretreatment (degreasing, phosphating, chromating, blasting).
Drying to remove moisture.
Electrostatic powder spraying.
Curing in a convection or infrared oven.
Controlled cooling to prevent warping and ensure uniform film.
Long-term corrosion protection and durability for critical steel structures.
Environmentally friendly, low-waste coating solution.
Wide compatibility with multi-layer protective coating systems.
Optimized cathodic protection with enhanced scratch resistance.
High efficiency in coverage, reducing powder consumption.
Consistent finish and mechanical performance across large-scale projects.
1. What substrates are suitable for MT-PZ ALZ55N?
MT-PZ ALZ55N is primarily designed for mild steel with proper surface preparation. It is not recommended for cast steel, electro-zinc coated steel, hot-dip galvanized steel, or zinc-sprayed surfaces. Proper grit or shot blasting to Sa 2.5 is essential to ensure optimal adhesion and corrosion protection.
2. Can MT-PZ ALZ55N be used as a single-coat system?
No, MT-PZ ALZ55N is intended as a primer layer in a duplex or multi-layer system. It must be over-coated with compatible powders (epoxy, polyester, super-durable polyester) or approved polyurethane liquid topcoats to achieve full corrosion protection and durability.
3. What is the recommended curing temperature and time for this primer?
Curing should be done in a convection oven or infrared heaters, maintaining the object temperature between 110°C and 180°C. Ensure the primer is fully gelled before applying topcoat. Curing parameters must be strictly controlled to achieve full cross-linking and optimal corrosion resistance.
4. How long can MT-PZ ALZ55N be stored before use?
When stored under dry, cool conditions (≤ 30°C), the shelf life of MT-PZ ALZ55N is at least 12 months from the production date. Keep the packaging sealed to prevent moisture absorption.
5. Can unused powder be recycled?
Yes. Unused powder can be reclaimed and reintroduced into the coating system, but a minimum of 70% new powder is recommended to maintain consistent performance. Gun nozzles must be cleaned regularly (every 30 minutes) to prevent buildup and ensure uniform spraying.
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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