Spray and immersion phospho-degreasing is a pre-treatment that combines degreasing and phosphating, creating a conversion layer that prepares metals for painting by improving adhesion and corrosion resistance.
It is applied before powder or liquid painting, after machining and washing, to protect against corrosion and stabilise the quality of the cycle.
It is used throughout the industrial painting supply chain for metal products for carpentry, components and sheet metal, from contract work to assembly.
The most common chemicals use iron or zinc phosphates (sometimes manganese or nickel) to form a thin crystalline layer that increases micro-roughness and anchoring.
The main systems are multi-stage spray tunnels with integrated tanks for degreasing, rinsing, activation, phosphating, passivation and demineralisation.
Immersion tank lines ensure uniform coverage even in cavities and difficult areas, with often superior results on complex geometries.
The parameters are calibrated according to the material and requirements: 30-180 s for the stages, alkaline pH for degreasing and acidic pH for phosphating, typical temperatures 50-60 °C.
The result is a clean, activated and protected base that reduces painting defects and improves the corrosion resistance of the products.
Ceever designs and manufactures automated phosphating and degreasing systems that are programmable and can be integrated with production management systems (MES).
