Characteristics of phosphating plants
Phosphating

For spray and peel installations, please refer to the article Surface treatment of metals prior to application of organic coatings. Process.

In the case of immersion, the following factors must be taken into account for the proper operation of a bath with a given formulation:

• concentration (AcT ) ;

• ratio of total acidity (AcT ) to free acidity (AcL ) ;

• gas pedal or Fe²⁺ content;

• immersion time ;

• temperature to ± 2 to 3°C.

It is generally recommended not to exceed a surface area immersed per charge of 1 m² per 100 liters of bath. If the surface area immersed per charge deviates...