Powder coating primer containing zinc MT-PZ ALZ44TH
Product Description
MT-PZ is a powder coating primer containing zinc which is designed to give enhanced corrosion protection of mild steel. This duplex system combines cathodic protection and barrier effect. Dedicated to steel protection with a surface pre-treatment obtained by grit/shot. MT-PZ is based on a specific epoxy zinc rich formulation that brings conductivity to enable the cathodic protection. MT-PZ includes a specific anticorrosive function which improves the protection in case of scratch.
Powder Properties
| Chemical type |
Thermosetting epoxy |
| Appearance |
Smooth |
| Color |
Grey |
| Recommended Film Thickness (µm) |
70 – 120 µm |
| Density (g/cm3) |
2.9 ± 0.03 g/cm³ |
| Application |
Electrostatic |
| Storage |
Under dry, cool (≤ 30°C) conditions |
| Shelf life |
At least 12 months from production date |
Pretreatment
Surface preparation depends upon the metal, the type of surface, its conditions and the required performance. See our recommendation for pretreatment to be used with MT- PZ.
| Substrate |
Mechanical pretreatment |
Chemical pretreatment |
| Mild steel |
Grit Blasting Sa 2.5 in accordance with ISO NF EN 8501-1. Roughness: Rz 35 60 µm / Ra 6-12 µm |
Banned |
| Cast steel |
| Electro Zinc steel |
Banned |
| Hot dip galvanized steel |
| Zinc sprayed (gas flame/electrical deposition) |
Application
MT-PZ is suitable for corona electrostatic spraying. Tribo application is not recommended.
| Application settings |
Fluidizing air pressure: 1.5kg/cm2 initially then 1kg/cm2 Transport air pressure: 0.5 to 0.8 kg/cm Recommended voltage: 65 to 70kV |
| Curing limits |
Primer should be cured, or at least gelled, using the recommended curing schedules, before application of the topcoat. The object temperature must not be below 110°C or above 180°C. The primer should be cured in a convection oven, optionally with infra-red heaters, with air temperature not exceeding 180°C. |
| Recommended film thickness |
70-120 µm A good protection is linked with the recommended film thickness. |
| Recycling |
Trials, with suitable recycling equipment, must be carried out before commencing production. Attention should be paid to the ratio of new powder, a minimum of 70% must be used. Gun nozzles must be cleaned every 30 minutes. |
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