Powder coating primer containing zinc MT-PZ ALZ55V
Product Description
MT-PZ is a powder coating primer containing zinc which is designed to give enhanced corrosion protection of blasted 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 promotes conductivity to enhance its cathodic protection. MT-PZ includes a specific anticorrosive function which improves protection even in cases of scratching.
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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