Product Categories / Metal Treatment / Steel Treatment / Zinc Phosphating

Duradraw 333

Product description

  • Duradraw 333 is a zinc phosphating product used to produce heavy zinc layer in low carbon wire coils in wire draw process.

Feature:

  • Duradraw 333 provide corrosion protection during storage and transportation of coils.
  • Duradraw 333 inhibits wear rates of dies, failure of brakes in drawing machine and rupture of coils during process.
  • Duradraw 333 works with accelerator and without accelerator.

Applications

Duradraw 333 is used on low carbon steel wire coils drawing lines.

Physical & Chemical Properties:

Appearance : Clear colorless liquid.
PH (1%) : 2.7 ± 0.2
Sp.gr at 25°C : 1.5 ± 0.05
Free acid point (1%) 1.06 ± 0.1
Total acid point (1%) 8.5 ± 0.3
Miscibility in water   Miscible.

Equipment:

The main process tank can be fabricated from stainless steel or lined mild steel. All other equipment in contact could be of stainless steel 316.

Operating Parameters:

Concentration (v/v %) : 4.0 to 6.0
Temperature (°C) : 50 to 70
Time (min) : 4 to 15
Free acid point : 4 to 6
Total acid point : 34 to 50
Phosphate points : 20 to 30

Process Sequences:

  • Acid cleaning and pickling with HCl or H2SO4
  • Spray Water Rinse.
  • Water Rinse.
  • Activation
  • Zinc Phospahting with Duradraw 333
  • Water Rinse.
  • Neutralization
  • Drying
  • Wire drawing.

Initial Preparation :

  • Add 40 to 60 liter (60 to 90 kg) of Duradraw 333 per 1000 lit of operating volume.
  • Add Duradraw 333 to water after filling half of operating bath solution, while mixing.
  • Add accelerator, 500-1500 ml of Duradd 16, Duradd 16 should be diluted with 20% solution with water before adding. Add slowly while mixing.
  • Accelerator can be used only where the productivity of line is speed up, otherwise the Duradraw 333 can work without accelerator to reduce the sludge.
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