Powder coating primer containing zinc MT-PZ ALZ90F

Surface Finish Options Overview

MT-PZ ALZ90F is a zinc-rich epoxy powder primer designed to provide enhanced corrosion protection for mild steel. The primer combines cathodic protection and barrier effects, delivering superior performance in industrial and infrastructure applications. Optimized for steel substrates prepared via grit or shot blasting, MT-PZ ensures robust adhesion, uniform coverage, and long-term durability.

This primer is suitable for multi-layer protective coating systems, approved under Qualisteelcoat standards (Base Material: Steel PE-0097, 2-coat system up to C4-H) and is ideal for high-demand corrosion environments, including machinery, structural steel, and architectural components.

Key Features

• Dual Protection Mechanism – Provides cathodic protection via zinc conductivity, combined with a dense epoxy barrier layer

• Scratch Resistance – Specific anti-corrosive functionality maintains protection even in case of minor surface damage

• Excellent Adhesion – Optimized for grit-blasted mild steel and pre-treated galvanized surfaces

• Durable Performance – Resistant to corrosion, chemicals, and mechanical wear

• Flexible Integration – Compatible with most epoxy, polyester, and PU topcoats

Powder Properties

Recommended Substrate Pretreatment

Note: Proper pretreatment is critical to ensure adhesion, corrosion resistance, and long-term performance.

Application Guidelines

• Application Method: Suitable for corona electrostatic spraying. Tribo application is not recommended.

• Spray Parameters:

  • Fluidizing air pressure: 1.5 kg/cm² initially, then 1 kg/cm²

  • Transport air pressure: 0.5–0.8 kg/cm²

  • Recommended voltage: 65–70 kV

• Curing:

  • Primer must be cured (or at least gelled) before topcoat application

  • Object temperature: 110–180°C

  • Cure in a convection oven, optionally with infra-red heating

• Film Thickness: 70–120 μm recommended for optimal protection

• Recycling: Minimum 70% new powder recommended; gun nozzles must be cleaned every 30 minutes

System Integration & Topcoat Compatibility

MT-PZ is designed as a base primer in duplex or multi-layer coating systems. Compatible topcoats include:

• Epoxy powders

• Polyester or super-durable polyester powders for outdoor and architectural applications

• Polyurethane liquid topcoats for enhanced chemical or mechanical resistance

This system is suitable for ISO 12944 corrosion protection up to C4-H, depending on substrate preparation, total film build, and environmental exposure.

Advantages of MT-PZ Powder Primer

• Enhanced Corrosion Resistance: Dual mechanism provides long-lasting protection in industrial environments

• Edge Coverage: Excellent penetration for complex geometries and corners

• Chemical and Mechanical Durability: Resistant to moisture, salt spray, and handling damage

• Operational Flexibility: Suitable for multi-layer protective coating systems, including industrial and architectural projects

• Environmental Safety: Solvent-free and compliant with modern environmental standards

Typical Applications

• Structural steel in warehouses, logistics facilities, and industrial plants

• Machinery frames and protective housings

• Architectural steel and galvanized components

• Pipelines, valves, and infrastructure requiring high-performance duplex coating systems

Extended Notes

1. MT-PZ ALZ90F is not intended as a decorative finish; always overcoat with a suitable topcoat.

2. Long-term performance is highly dependent on surface preparation quality and uniform curing.

3. For projects with extended storage before topcoating, surface activation (light sweep blasting) may be required to maintain intercoat adhesion.

4. Do not use as a standalone primer in UV-exposed outdoor applications without a compatible topcoat.

FAQ

1. Can MT-PZ be applied on untreated steel?

   • No, surface must be grit-blasted or appropriately pre-treated to ensure adhesion and corrosion protection.

2. What is the maximum time before applying topcoat?

   • Up to 3 weeks under clean, dry indoor storage. Light surface activation may be required if exceeded.

3. Is MT-PZ UV-resistant?

   • No, it requires a compatible topcoat for outdoor UV exposure.

4. Can the powder be reclaimed and reused?

   • Yes, with proper recycling equipment. Minimum 70% new powder is recommended.

5. Which topcoats are compatible with MT-PZ?

   • Epoxy powders, polyester powders, super-durable powders, and approved PU liquid topcoats.

6. What is the recommended curing temperature?

   • 110–180°C, using a convection oven or infrared-assisted cure.

7. Is MT-PZ suitable for tribo electrostatic spraying?

   • No, only corona spraying is recommended for optimal film uniformity and adhesion.

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.