Iron phosphating

Eisenphosphatierung

Iron phosphating

Iron phosphating is a relatively low-cost pre-treatment process.

It is used to improved the adhesion strength and the corrosion protection when painting. The phosphate layers adhere very well, since the layer which is formed crystallises directly onto the metal lattice of the base material.

Phosphating solutions consist mainly of acid alkaline phosphates and free phosphoric acids.

Due the the pickling reaction which starts, Fe++ is released and reacts, forming insoluble iron phosphate with the phosphate ions from the solution, and precipitates firmly adhering to the metallic surface.

The typical iron phosphating agents work in a mildly acidic environment between pH 4 and pH 6.

In order to create sufficient layers, requires on average 60-120 seconds in the spray process and 3-5 minutes in the dipping process, at temperatures of 40-60°C.


Do you have questions about iron phosphating?

by online form:
to the online form