This Medium temperature phosphating liquid has the properties of oil removal, rust removal, phosphating and passivation. Mildly rusted ferrous metal devices, or ferrous metal products with liquid oil stains, can be directly phosphated with this product. The resulting phosphating film has a good protective effect on the metal and can improve the corrosion resistance of the metal. and insulation and paint adhesion. When using, attention should be paid to: first, during phosphating treatment, the temperature of the liquid should be controlled at 55 to 65°C (the minimum should not be lower than 40 degrees Celsius, and the maximum should not exceed 70°C), and the metal should be soaked in it for 5 to 15 minutes; second, in the liquid Only when the ferrous iron content is 5-7g/L can a better treatment effect be achieved; thirdly, the ratio of free acid to total acidity should be controlled at 1:8
Phosphate conversion coating is a chemical treatment applied to steel parts that creates a thin adhering layer of iron, zinc, or manganese phosphates, to achieve corrosion resistance, lubrication, or as a foundation for subsequent coatings or painting. It is one of the most common types of conversion coating. The process is also called phosphate coating, phosphatization, phosphatizing, or phosphating. It is also applied to firearms and other military equipment.
A phosphate coating is usually obtained by applying to the steel part a dilute solution of phosphoric acid, possibly with soluble iron, zinc, and/or manganese salts. The solution may be applied by sponging, spraying, or immersion.Phosphate conversion coatings can also be used on aluminium, zinc, cadmium, silver and tin.
How to use this Medium temperature phosphating liquid: Add 150-200 liters of this product for every 1000 liters of working fluid, stir thoroughly - heat to working temperature - measure total acid and free acidity - properly treat the solution with clean waste steel plates to obtain a normal phosphating film. To increase the thickness of the phosphating film, the amount of phosphating solution can be appropriately increased. The total acidity will increase accordingly, and the control of the single acid ratio can remain basically unchanged.
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