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Durapass 744

Product description

Durapass 744 is a liquid blended product formulated
with chromium (III) salts and other additives suitable for
post treatment of iron, steel, zinc.

Application

  • Durapass 744 can be used after zinc plating,
    phosphating and galvanizing process.

Features

  •  Durapass.744 passivation gives temporary corrosion protection to sensitive substrates after to phosphate and galvanizing.
  •  Durapass.744 is suitable for immersion and spray
    systems and provides extra resistance against corrosion. Improves adhesion and minimizes under
    film blistering of final finish.
  •  Durapass 744 is most suitable product for post treatment after iron phosphating, zinc phosphating
    for substrates like iron, steel, galvanized steel.
  •  Durapass 744 is used after zinc plating and can provide corrosion resistance to alloy surface with
    desirable shade from yellow to blue.

Physical Properties

Appearance :Liquid
Color :Black green
pH (1%) :2.5±0.2
Sp.gr :1.32±0.04
Total Acid point (1%) :2.4±0.2 (0.1N NaOH)
Miscibility in water :Miscible at all ratios

Equipments

Operating tank and all the equipment in contact should be made from Stainless
steel.

Process Sequences

  •  Cleaning with Duraclean products
  • Water rinse – twice
  •  Phosphating with Duraphos products/ Zinc plating
  •  Water rinse – twice
  •  Passivation with Durapass 744
  •  Drying

Operating Parameters

Concentration(ml/l) :Zinc : Phosphate

plating :150 to 250
galvanizing :1.0 to 3.0

Total Acid points :60 to 100: 1.80 to 2.0
pH  :1.80 to 2.0 :2.0 to 3.0

Temperature (°C) 25 – 50 :Ambient
Time (Sec) :30 – 90 :30 – 9

Process Sequences

  • Cleaning surface from grease, oil and dust.
  •  descaling with Dura pickling liquid
  •  Passivation with Durapass SS
  •  Hot water Rinse.
  •  Drying

Initial preparation:

  •  Add 150 to 250 lit of Durapass 744 per 1000 lit of operating volume for zinc plating process.
  • Add 1 to 3 lit of Durapass 744 per 1000 lit of operating volume for phosphating and galvanizing.
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