Protection Against Molten Zinc
Case
Equipment used in the hot galvanizing industry, such as tanks and tools, are in contact with molten zinc at 450-500°C and need to be protected against dross adhesion and erosion.
Challenges
The particular challenges in this application arise from:
- Corrosion: the reaction between the steel and liquid zinc increases the zinc dross content in the bath and wears the equipment
- Dross adhesion: the corrosion product, zinc dross, sticks to the walls and bottom of the tank, from where it must be mechanically cleaned to prevent contamination of the end product
- Erosion: the tank walls are eroded by ZnO and NaCl at the surface of the liquid zinc
Our Coating Solution
Thermal spraying of a ceramic coating with a Master Jet® and a Spinel Flexicord provides an economical solution for any geometry of work piece.
Benefits
- Thermal spray allows for coating deposition to virtually any material
- Flexicord coatings are easy to apply manually on complex shapes
- Easy to clean: low wettability of spinel by molten zinc prevents sticking
- Abrasion resistant: ceramic coatings provide resistance to scratches from tools when cleaning the equipment
- Thermal shock resistant: Optimal structure of the coatings handles thermal shocks extremely well
- Impact resistant: Due to their lower internal stresses, Flexicord coatings resist impacts better than typical ceramic coatings
- Thermally insulating: less energy required to keep metal in molten state
- One step process: No sintering/curing required
The Master Jet® system is:
- Economical (low CAPEX)
- Easy to use and maintain
- Lightweight, making it optimal for on-site work and for extended operations
