Galvanization
Zinc thermal spraying- zinc metalization is process of spraying molten zinc wire Zn 99.99
The thickness of zinc coating is 60-120 micrometers.
Workable element surfaces up to 12 m.
Guarantees to DIN (55 928) standards from 1-5 years.
Workable surfaces:
- Profiles
- Constructions
- Fences
- Stairs
- Containers etc.
Metallization procedure – applying the metal coating is performed within 4 hours on surfaces that were prepared with sandblasting process to the degree SA 3, followed by dust removal with clean dry air.
This way of galvanizing may protect whole or just some parts of the construction.
DUPLEX – system: if needed or upon request, galvanized surfaces are painted with primer and lacquer finish or just electrostatic powder coated in shades if requested by client.
Table 2 – Procedures of galvanizing in industry and features of coating
| Procedure | Method of coating | Characteristics of the procedure |
Characteristics of coatings |
| Warm galvanizing |
Dipping items in melted Zn which after emergence hardens and creates a coating |
Very fast coating, suitable for continuous operation, low utilization of the melt, a thin coatings are not possible |
Uneven thickness, especially in profiled objects, firmly grip caused by interlayer alloy with substrate |
| Galvanic galvanizing; electroplating | Cathodic reduction of Zn ions in the electrolysis solution of Zn-compounds |
Expensive equipment, slow application |
With processing time thickness increase, but it is uneven in profiled objects |
| Metallization galvanizing (hot spraying) | Spraying Zn-melt with gun, heated by gas or electric arc | Suitable for large objects and objects on the field, possible nonmetal coating, large losses in processing oblong Items |
Porosity and roughness, possible thick coating and coarse regulation of multi layered application |