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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.