Powder coating primer containing zinc MT-PZ ALZ44TH
WA：+86 132 6275 2056
WEB: std-coatings.com
Product Overview
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 ofcathodic protectionandbarrier 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.
Powder Properties
| 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 |
Surface Pretreatment Guidelines
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.
Application Guidelines
MT-PZ ALZ44TH is optimized forcorona 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.
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