Phosbond-ZXC (Light Zinc Cold Phosphating)
This is an accelerated cold Immersion phosphating process, which produces light to medium weight phosphate coating on iron and steel surfaces. The coating produced by Phosbond-ZXC serves as an excellent base for paint and powder coating. Phosbond-ZXC phosphating process gives medium weight coating and protects. Iron and steel surfaces against rusting.
Phosbond-ZXC meets to the requirements of IS:3618:1966 class B/C.
Product Specifications
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a.
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Colour
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Light green liquid
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b.
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Chemical Composition
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Blend of phosphates, nitrates, zinc, activators, etc.
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c.
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Odour
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Slightly Pungent
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d.
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Foaming Tendency
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Nil
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e.
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Reliability
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Good
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f.
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Handling
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Avoid skin contact
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g.
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Solubility
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Good
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h.
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pH
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Acidic Range
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I.
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Toxicity
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Nil
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j.
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Flash Point
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Nil
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k.
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Pollution Hazard
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Moderate
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Product Operating Data
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Dip
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Concentration
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5%
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Time
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5- 20 minutes
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Temperature
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R. T.
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Total Acidity
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18-22 ml
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Free Acidity
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1- 1.5 ml
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Accelerator
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Light Blue
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Product Operating Procedure
- Degreasing
- Water Rinsing
- Derusting
- Water Rinsing
- Activator
- Phosphating
- Water Rinsing
- Passivation
- Drying
Product Application Equipments Phosbond-ZXC tank should be fabricated with 3 to 4 mm thick M.S. Plates with continuous current hating system.
Testing and control Procedure
Total Acidity
Pipette out 10 ml. of bath solution in a conical flask. Add a few drops of Indicator Phenolphthalein. Titrate with N/10 sodium Hydroxide until permanent pink colour appears, bath pointage should be maintained between 18 to 22 ml. Adjust the pointage by adding Phosbond-ZXC to the bath. For each pointage less add 200 ml. of Phosbond-ZXC per 100 liters of bath.
ACCELERATOR Test starch-iodide paper.
Dip a piece of starch lodide paper in the bath.
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No Accelerator
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Remains White
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Insufficient Accelerator
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Pale Mauve
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Optimum
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Blue to Dark Blue
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Excess Accelerator
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Black
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It is very important to have the correct amount of Accelerator in the bath. Excess in the bath will cause excess sludge formation and wastage of Phosbond-ZXC insufficient addition causes accumulation of Iron salts and throws the bath out of balance.
Chemical Replenishment
Restore the bath to the working level by adding water to makeup evaporation loss and drag out losses. Check the Phosbond-ZXC pointage.
Safety Measures
Phosbond-ZXC is an acidic liquid material, and while handling proper care should be taken. Protect eye, skin by means of goggles, aprons, gloves etc. If it comes in contact with skin and eyes wash thoroughly with a flush of water and get medical advice.
General Information
Corrosion Resistance: Excellent
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