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Kemchrome-350
(Chromotising)
Product Description
Kemchrome-350 is specially formulated for the treatment of Aluminium
and its alloys by immersion method. Kemchrome-350 gives a thin,
smooth amorphous oxy chromate coating, which is normally rainbow
in nature of golden brown in colour. This coating is an excellent
base for paint. This is also a good coating to avoid white rust on
aluminum.
Product
Specifications
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a.
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Colour
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Golden Yellow liquid
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b.
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Chemical Composition
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Blend of Chromium and Additives
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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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Nil
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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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Moderate
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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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Highly Hazardous
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Product Operating Data
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Concentration
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3 - 5%
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Dip Time
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2 5 min
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Temperature
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Room
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Pointage: TA
Fa
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9 14 ml
4 6 ml
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Product Operating Procedure:
Degreasing
Prior
to Kemchrome-350 dip the job is to be properly degreased either by
chlorinated vapour degreasing method or by caustic free degreasing
solution.
Rinsing
Rinsing
should follow degreasing, job should be properly washed with running
water by dip or spray method.
Chromastising
After
water rinse the job should be dipped in 3 5% of Kemchrome-350
solution for desired coating.
Water
Rinsing
Job
should be rinsed properly.
Drying
After
water rinsing, the job should be properly dried by hot air blowing.
Product Application Equipments
S.
S. tank of 3 4 mm thickness.
Testing and Control Procedure
Free
Acidity
Pipette
out 5 ml of bat solution in a conical flask. Add 4-6 drops of Bromocresol green indicator. Titrate it against N/10 NaOH solution.
The consumption of N/10 in burette will give the free acidity of the
solution.
Total
Acidity
Pipette
out 10 ml. Of bath solution in a conical flask. Add 50 ml of D. M.
water and 10 ml of phosphoric/sulphuric acid mixture. Add 1 2
gms. of potassium lodide powder. Mix it thoroughly, add 15-20 drops
of starch solution indicator. Titrate it against N/10 sodium
thiosulphate. Colour of the solution will change from black to green.
The consumption of N/10 sodium thisoulphate in burette will give the
total acidity of the solution.
Chemical Replenishment
Add 2.6 ltr. Of Kemchrome-350 for every 100 ltr. of water to raise
the acidity pointage by 1. based upon organic compounds.
Safety Measures
Kemchrome-350 is based upon organic
compounds, so while handling, proper care should be taken. Protect your eyes and skin by means of goggles, aprons, gloves etc. If it comes in contact
with skin and eyes, wash thoroughly with a flush off water and get
medical advice.
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