Powder coating primer containing zinc MT-PZ ALZ55V

Surface Finish Options Overview

MT-PZ ALZ55V is a high-performance zinc-rich epoxy powder primer designed to provide exceptional corrosion protection for mild steel. Combining cathodic protection and a barrier effect, this duplex system ensures long-lasting durability for critical steel structures exposed to harsh environments. Its specially formulated epoxy-zinc composition provides conductivity to enhance cathodic protection, while an integrated anticorrosive function ensures protection even in the case of surface scratches.

This primer is ideally suited as the base layer in multi-layer protective coating systems and is recommended for industrial and structural applications where steel longevity and protection against corrosion are critical.

Application

MT-PZ ALZ55V is suitable for:

• Industrial Steel Structures: Warehouse frameworks, machinery frames, storage racks.

• Infrastructure Components: Bridges, guardrails, pipelines, and steel supports.

• Architectural Elements: Window frames, gates, fences, and structural steel in buildings.

• Heavy Machinery: Agricultural, construction, and mining equipment.

• Marine and Coastal Steel: Exposed steel structures in C3–C4 corrosivity categories (per ISO 12944) when combined with compatible topcoats.

Typical Coating System Recommendation:

• Substrate: Grit/shot-blasted mild steel

• Primer: MT-PZ ALZ55V (70–120 µm)

• Intermediate / Topcoat: Epoxy, polyester, or polyurethane powders/liquids depending on chemical and UV exposure

• Performance: Duplex coating system achieving long-term corrosion resistance, suitable for moderate to high corrosive environments

Standards & Compliance

MT-PZ ALZ55V has been tested and meets or exceeds the following international standards:

1. ISO 12944 – Corrosion protection of steel structures by protective paint systems (C3–C4 categories)

2. ISO 8130 – Determination of particle size and distribution for powder coatings

3. ISO 2360 – Measurement of film thickness for coating systems

4. Qualisteelcoat Approved: Base Material Steel PE-0097 (2-coat system)

Powder Properties

Pretreatment Recommendations

Proper surface preparation is essential to achieve the optimum adhesion, corrosion protection, and overall system performance.

Application Notes

• Maintain the recommended film thickness (70–120 µm) to achieve maximum barrier and cathodic protection.

• Curing should occur in a convection oven with air temperature ≤180°C. Infrared heaters may be used if required.

• Object temperature during curing should not fall below 110°C or exceed 180°C.

• Reclaimed powder may be recycled with a minimum of 70% new powder to maintain coating performance.

• Gun nozzles should be cleaned every 30 minutes to prevent buildup and ensure even application.

Features & Benefits

• Cathodic Protection: Zinc-rich composition provides galvanic protection to exposed steel.

• Scratch-Resistant Barrier: Specialized anticorrosive function protects newly scratched surfaces.

• Durable & Stable: Excellent adhesion, mechanical performance, and long-term corrosion resistance.

• High Coverage Efficiency: Suitable for thick coatings with uniform distribution.

• Environmentally Friendly: Powder coating system is solvent-free and generates minimal waste.

• Versatile Over-Coating: Compatible with epoxy, polyester, and polyurethane topcoats.

Packaging

• Supplied in 20–25 kg sealed boxes with inner plastic liners to prevent moisture.

• Store in dry, ventilated conditions below 30°C.

• Protect from strong light, heat, and moisture to maintain powder flowability.

FAQ

1. Can MT-PZ ALZ55V be used on hot-dip galvanized steel?
No. This primer is designed specifically for grit- or shot-blasted mild steel. Alternative primers are recommended for galvanized surfaces.

2. What is the recommended over-coating system?
MT-PZ ALZ55V can be over-coated with epoxy, polyester, super-durable polyester, or approved PU liquid topcoats depending on exposure conditions.

3. How long can MT-PZ ALZ55V wait before applying the topcoat?
Up to 3 weeks under clean, dry indoor storage. If exceeded, light surface activation may be required.

4. What curing conditions are required?
The object must be heated to 110–180°C for proper curing, ensuring the primer forms a fully cross-linked barrier.

5. Is MT-PZ ALZ55V UV resistant?
No. It is intended as a base primer and must be protected with a UV-stable topcoat for outdoor applications.

6. Can recycled powder be used?
Yes. Trials should be conducted, and at least 70% new powder must be used to maintain performance and corrosion protection.

7. What industries typically use MT-PZ ALZ55V?
Industrial machinery, infrastructure projects, steel warehouses, pipelines, and architectural steel components.

8. How should I clean the spraying equipment during application?
Nozzles and gun tips should be cleaned every 30 minutes to prevent clogging and uneven coating.

Types of powder coating

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 coating colours and effects

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.

Powder coating process

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 coating benefits

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.

Applications for Powder Coatings

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.

FAQ

What is Powder Coating?

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.

What does powder coating do?

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.

Is powder coating better than paint?

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.

Why is it called powder coating?

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.

What are the different types of powder coating?

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.

Which material is used in powder coating?

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.

How long will powder coating last?

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.