Iron Phosphating & Multi-Stage Systems
Adhesion starts before the powder gun.
A multi-stage pretreatment system designed to prepare steel, aluminium, and galvanised substrates for maximum powder coating adhesion and corrosion resistance — from 3-stage basic iron phosphate to full 7-stage zinc phosphate systems.
Why this product
Powder coating failure is almost always a PT failure.
The most common cause of coating delamination, corrosion creep, and adhesion failure in the field is not the powder — it's inadequate pretreatment. The substrate must be clean, phosphated, and passivated before powder enters the gun. Skipping or underdoing PT removes the foundation the coating needs to last.
- 3-stage basic iron phosphate for standard steel substrates in mild-corrosion environments
- 5-stage system adds derusting and passivation for improved corrosion resistance on pre-rusted substrates
- 7-stage zinc phosphate delivers 500+ hours salt spray resistance per ISO 9227 — for high-corrosion applications
- Spray tunnel design for conveyorised production or dip tank for larger, complex geometries
- Electric immersion or steam heating; MS or SS-304 tank and tunnel construction
- Integrated drain, pump, and agitation systems as standard
Models & Configurations
Select the right PT process for your application
Degreasing → Iron Phosphate → Water Rinse
The 3-stage system covers degreasing, iron phosphate application, and water rinse. Suitable for clean steel substrates in controlled environments where corrosion exposure is limited — the most cost-effective starting point for standard industrial powder coating.
- Stage 1Degreasing (alkali or mild acid)
- Stage 2Iron phosphate application
- Stage 3Water rinse
- Best forClean steel; indoor or mild environment applications
Technical data
Full specifications
Where it's used
Applications & use cases
- Steel fabrications for industrial and architectural applications
- Automotive components requiring high corrosion protection
- Agricultural machinery and outdoor equipment
- Electrical panels and switchgear enclosures
- Architectural aluminium profiles (anodise-quality pretreatment)
- Conveyorised and batch production lines
Works with
Compatibility & integration
Ready to specify?
Spec the right pretreatment. Adhesion is the foundation.
Tell OptiFinish your substrate, corrosion requirements, and throughput — we'll specify the right number of stages and system type for your application.