Phosphatizing
The phosphatizing is a Chemical reaction operated by means of a phosphorated agent . In Iron and steel industry, this operation more particularly indicates the treatment of the Acier by the phosphoric Acid .
History
The scouring of a steel surface using a diluted and hot solution of phosphoric acid causes the formation of Phosphate of iron, which ensures a Passivation and improves the behavior with the Corrosion of the coatings of Peinture. It is a fact known for a long time, named Pickling , or also proceeded Duplex Footner when phosphoric passivation follows a scouring to the sulphuric Acid .Phosphatizing in aqueous solution of the metals by iron phosphate goes back to 1906 with the English patent of Thomas Coslett, deposited in France in 1907, and the first applications appeared in 1908 under the name of Coslettisation . Since 1910, Coslett used solutions containing phosphoric acid and of phosphate of Zinc.
Parkerizing
See also: Parkerizing
The parkerizing is a technique of “major” Phosphatation to the Manganèse known as.
It allows a Protection Chimique of a Métal in order to avoid its Oxydation (Corrosion). The Iron, for example, is plunged in a hot bath of Phosphate of zinc causing the formation of a layer of Phosphate of iron Imperméable.
This technique is used in the auto industry.
Bonderization
Light phosphatizing “with the Zinc” also called “Bondérisation” appeared in 1929 thanks to research of the Parker Rust Proof Co, this process was described by Jean Cournot and Jean Bry in a report presented to the international congress of the mines of the Métallurgie and Géologie applied to Liege in May 1930.
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