Iron phosphatation or amorphous phosphatation is a superficial chemical transformation of a substrate using an appropriate acid solution to perform two functions :
Create an adhesive base for organic coatings.
contribute to the corrosion protection of the surface treatment + paint system.
Name of the process :
Degreasing-phosphatation: because it allows to combine the two operations in a single step
Iron phosphation: because the layer formed on steel is based on iron phosphate (iron from the substrate)
Amorphous phosphatation: because the formed layer has no well-defined structure (no crystals).
The phosphatation process is complex because it requires a careful surface preparation and precise knowledge of the elements present on the surface which may be of a different natures :
FAT SURFACE FILM
corrosion protection oil on coil
lubricant for shaping parts (stamping, etc.)
Average protection oil rate: 2 g/m² (1.5 to 3 g/m²)
POLLUTION ELEMENTS IN CONTACT WITH THE SURFACE
rolling mills (metal dust from cylinder wear)
annealing (decomposition of rolling oils)
migration to the metal surface of certain steel components, including carbon
POLLUTION ELEMENTS IN CONTACT WITH THE OIL FILM
environment, dust, filings,
manufacturing process (grinding, drilling, sawing, etc.).
There are three modes of application of BONDERITE® amorphous phosphatations :
Spraying: tunnel, machine
Immersion: small series, hollow body
High-pressure: very large parts
AREAS OF APPLICATION FOR BONDERITE® AMORPHOUS PHOSPHATATIONS :
Preparation before painting
Degreaser/phosphatant: amorphous iron phosphatation, dip application, jet and high pressure system, multi-metal, low layer weight/high layer weight, mineral or organic accelerator, mono or bi-component,
Below are our standard BONDERITE® DEGREASER-PHOSPHATANT :
BONDERITE M-FE HP
BONDERITE M-FE 687
BONDERITE M-FE LF-3820
BONDERITE M-FE 30 A
BONDERITE M-FE 1070
List not exhaustive, contact us for a recommendation or if you are looking for another reference.