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PHOSPHATING :

Phosphate films are produced by chemical reaction between the constituents of the phosphating solution employed and the metal being treated. Conventionally mild steel is phosphated for various applications; though occasionally aluminum is also treated. The quality of the coatings is influenced by the composition of the basic metal surface and also by its physical condition.

Phosphate coatings

- Can be used as efficient lubricant carriers to provide resistance to wear, fretting, galling, scuffing and to aid running-in on rotating and sliding surfaces.
- Can act either on their own or by carrying a suitable lubricant as a production aid in cold metal working operations such as cold forming, wire drawing, impact extruding, etc.
- Have a wide field of application in manufacturing industry, both as an aid to mechanical production operations and in surface finishing.
- On metal consist of layers of crystalline, water insoluble metal phosphates of varied crystal size depending on the type of phosphate bath used, the kind of metal to be coated and the characteristics of the metal surface.

For protection against atmospheric corrosion, light weight coatings may be employed to give temporary protection during storage and between production stages.

Formulations based upon iron or manganese phosphate are mainly applicable to iron and steel articles and those based upon zinc phosphate may also be used for the production of phosphate coatings upon zinc surfaces.

The pre-treatment of surfaces to be painted or powder coated in order to provide improved coating adherence and a reduction in the risk of lateral corrosion developing under the organic coating.

Equipment :

A typical process sequence is :