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Pretreatment Systems
Pretreatment is the critical first step in the powder coating process. It involves the removal of oil, dust, rust, and scale from metal surfaces and the application of conversion coatings that promote powder adhesion and long-term corrosion resistance.
Raman Udyog offers a complete range of automated and manual pretreatment systems, including multi-stage spray tunnels, dip tanks, and ultrasonic cleaners, designed to meet industry standards across mild steel, aluminum, and galvanized parts.
Each system is engineered to deliver consistent surface activation, process repeatability, and minimal chemical waste through optimized chemical dosing, heating, and circulation controls.
Pretreatment is the foundation of durable powder coating, ensuring optimal adhesion, corrosion resistance, and surface integrity of coated parts. It involves a systematic sequence of chemical or mechanical cleaning, rinsing, surface activation, and conversion coating, customized to the type of metal substrate and end-use environment.
At Raman Udyog, we design modular, multi-stage pretreatment systems tailored for ferrous and non-ferrous components. These can be configured as spray tunnels, dip tanks, or hybrid lines, integrated seamlessly into manual or conveyorized setups.
Steps:
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Cleaning & Degreasing
– Removal of oils, dirt, and contaminants using alkaline or solvent-based cleaners. -
Derusting & Descaling (if required)
– Acidic pickling agents remove oxides, rust, and mill scale from steel parts. -
Water Rinsing (Single/Multiple)
– Critical neutralization and flushing to prevent carry-over. -
Surface Conditioning
– Surface activation for uniform conversion coating formation. -
Conversion Coating
– Application of Zinc Phosphate, Iron Phosphate, or Zirconium coatings to improve adhesion and corrosion resistance. -
Passivation / Final Rinse
– Optional sealing layer enhances performance in high-humidity or salt-laden conditions. -
Drying
– Treated parts are dried in a preheating oven to prepare for powder coating.