Phosphating and Rust Prevention Chemical
Phosphating and Rust Prevention Chemical
In a single operation, removes light rust and oil on iron and steel surfaces. Coats the surface with a phosphate layer, protecting it against rust. Increases surface roughness, preparing the surface for painting.
Rust-limescale and Bionil OW series catalog page
| Property | Value |
|---|---|
| Form | Liquid (dilutable) |
| Dilution | At a ratio of 3-5 with water |
| pH range | 4.5 < pH > 5.5 (must be monitored) |
| Effect | Rust removal + phosphate layer + paint preparation |
Dilute at a ratio of 3-5 with water (must be 4.5 < pH > 5.5)
Apply to the surface
Check the pH value at regular intervals
After the reaction, the surface is ready for painting
Dilute at a ratio of 3-5 with water (must be 4.5 < pH > 5.5)
Dilute at a ratio of 3-5 with water (must be 4.5 < pH > 5.5)
Apply to the surface
Check the pH value at regular intervals
After the reaction, the surface is ready for painting
Bionil PF Pre-Cleaning is an alkaline pre-wash chemical that removes oil, dirt and fabrication residues from stainless steel; it is used as a step before pickling. Bionil PF Phosphating, on the other hand, is an acidic conversion chemical that, on iron and steel surfaces, both removes oil/rust and leaves a phosphate layer that prepares the surface for painting, all in a single step. The two products are designed for different processes; the similarity of the names should not mislead.
The phosphate layer forms a porous, micro-crystalline film on the iron/steel surface. These pores allow the paint to lock mechanically onto the surface, increase adhesion strength by 2-3 times and delay the progression of corrosion under the paint. It is the indispensable pre-paint step of the automotive and white goods sectors.
This range is optimal for the phosphate reaction. Below pH 4.5 the bath becomes overly aggressive and the phosphate layer dissolves too quickly; above pH 5.5 the reaction slows down and the layer does not form homogeneously. Measuring the pH regularly and replenishing when needed directly affects the phosphating quality.
