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Phosphating is the treatment of metallic surfaces with aqueous and acid phosphate-containing solutions. The metal phosphate conversion layer resulting from the chemical reaction is slightly soluble and adheres firmly to the substrate.

Phosphating can be applied to steel, ferrous materials, zinc and aluminium.  First, the base material is attacked by pickling so that pH values of the solution associated with near-surface areas shift.  This leads to precipitation of poorly soluble phosphates, which form a layer.  The metal cations dissolved from the base material are stored in this layer again. However, there are processes in which metal cations of the solution are incorporated into the layer. This conversion layer is used industrially as a temporary corrosion protection and/or adhesion primer for e.g. oiling or cathodic dip painting.

Essentially, a distinction is made between:

  • iron phosphating
  • zinc phosphating
  • trirication phosphating

The process is usually carried out by dipping, but can also be applied by spraying. Depending on the application, medium to fine-crystalline zinc manganese or mixed iron phosphate layers are applied to screws or nuts. The layer thicknesses are between 2 μm and 20 μm.

Misc pages

Curing in process
Conveyor belt oven (continuous oven)
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Chain conveyor oven
Chamber oven
Drying process
Cooling (after annealing)
Exhaust air treatment
KTL breakdown voltage
Condensed water test according to DIN EN ISO 6270-2
Sacrificial anode
Local element
Surface protection
Hot-dip galvanising
Flame spraying
Galvanic coating
Conversion layer
Dry-film coat thickness
Fastening properties
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ISO 9001
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ISO 14001
Trueness of gauge
Coefficient of friction
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Fastening and assembly
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Corrosion College
Powder sintering process
Zinc flake coatings
Dip coating process
Stone impact test
Process stages of KTL-seperation
Corrosion testing atmospheres conducive corrosion
Coat thickness and coat thickness measurement
Adhesion test according to DIN EN ISO 10683
Cross-cut test for adhesion
Thread tolerance
Pressure water jetting test
Fertiliser resistance
Anodic dip coating (ADC)
Cathodic dip coating (CDC)

Technical terms can not always be avoided. As corrosion experts, we not only want to give you comprehensive advice, we are also interested in making you a corrosion expert yourself.

The variety around the topic of corrosion and corrosion protection is also in our glossary at home: explanations from A as in Adhesion to T as in Thread tolerance. Have fun clicking through!