The metal pipe is placed or sprayed in a dilute solution containing phosphoric acid and soluble phosphate to be properly treated to form an insoluble, well-adhering phosphate film on the metal surface. This process is called phosphating or phosphoric acid of the metal pipe. Salt treatment. Phosphate film can increase the adhesion and protection of anti-corrosion coatings and metal pipes.
According to the main components of the phosphating solution, there are zinc, zinc-calcium, manganese, manganese-zinc and iron. Different types of treatment solutions can obtain phosphate membranes with different thicknesses and different properties. Use the conditions to make the appropriate selection.
The phosphating treatment process is generally: chemical removal → hot water washing → cold water washing → pickling → cold water washing → phosphating treatment → cold water washing → phosphating post treatment → cold water washing → deionized water washing → drying. In the phosphating treatment of metal pipelines, “comprehensive treatment†is the development trend, that is, the combination of degreasing and phosphating to produce deoiling-phosphating “two-in-one†treatment liquid; or derusting-deoiling - Phosphating is combined to produce a "three-in-one" treatment liquid, thereby greatly reducing the cost of pretreatment. At present, countries are participating in research in this direction.
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Label: Phosphating metal pipe Adhesive properties Degreasing Metal surface
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