Most greenhouse equipment starts rusting the moment a scratch exposes bare metal. Spray coating only covers what the nozzle can see—leaving pores, welds, and hollow sections vulnerable.
Our process is different. We don’t just spray. We submerge, bond, and bake using Zinc-Phosphating and Electrocoating (E-coat) —an underwater chemical process that forces protection into every microscopic pore, hidden hole, and internal cavity. The result? A seamless, sacrificial shield that stops rust even if the surface is scratched.
Here is exactly how we build anti-corrosion superiority into every pipe-rail trolley:
1. Fabricate (Cut, Bend, Weld)
We start with raw steel, cutting it precisely, bending it to shape, and welding it into a rigid trolley frame. Every joint is inspected for spatter.
2. Abrasive Blasting
We blast the bare metal with abrasive media. This removes mill scale and etches a microscopic “anchor pattern” into the surface—giving the coating something to truly grip.
3. Immediate Air Blow & Inspection
We blow away every grain of dust and inspect the surface. No embedded grit, no oil residue—just perfectly prepared bare steel.
4. Alkaline Cleaning
We submerge the parts in a hot alkaline bath that strips away all fabrication oils, grease, and fingerprints. The metal becomes chemically clean.
5. Rinse
A high-pressure rinse removes any remaining cleaner. The surface is now water-break-free—meaning water sheets evenly without beading.
6. Zinc Phosphating (Underwater)
This is where our protection gets smart. The parts are fully submerged in a hot zinc-phosphate solution. This creates a chemical conversion layer—millions of microscopic crystals that bond to the steel. This layer stops corrosion and acts as the perfect glue for the paint.
7. Final Deionized Rinse
We rinse with ultra-pure deionized water, removing every last trace of conductive salt. No salt means no hidden corrosion later.
8. E-Coating (Underwater – The Critical Difference)
Now the parts enter the electrocoating bath. The component is charged with a negative current while the paint particles are positive. Because the entire process happens underwater, the liquid flows naturally into every pore, weld pinhole, cut edge, and hollow tube—both inside and outside of the part. The electrical charge pulls the paint particles evenly onto every millimeter of metal, even in hidden cavities that spray guns cannot reach.
Spray coating only covers what the nozzle sees. Our underwater E-coat covers everything—inside, outside, and everywhere in between.
9. Cure at 260°C (500°F)
Finally, we bake the coated trolley at 260 degrees Celsius. The paint cross-links into a hard, chemically resistant shell that bonds permanently to the phosphate layer.
Why This Beats Simple Spray Coating
| Spray Coating | Our Underwater E-Coat Process | |
| Hollow sections inside the equipment | ❌ Uncoated—rusts from within | ✅ Fully coated |
| Tight corners & welds | ❌ Thin or missed | ✅ Uniform thickness |
| Scratch resistance | ❌ Rust creeps under the paint | ✅ Zinc-phosphate stops corrosion spread |
| Longevity in humid greenhouse | ❌ Years, not decades | ✅ Decades, not years |
The bottom line:
A spray-coated trolley starts rusting the first time a rock chips the paint. Our trolleys are protected from the inside out—sealed by a process that water cannot wash away and rust cannot outrun.
Choose the trolley that survives the greenhouse. Choose AgriTrack’s true E-coat protection.