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Kemchrome-340
(Chromotising)
Product Description
Kemchrome-340 is specially formulated for the treatment of Aluminium and its alloys by immersion method. Kemchrome-340 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 coated to avoid white rust on aluminium.
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 & Cloth 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 Temperature
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2 - 5 min
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Temperature
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Room
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Pointage T.A.
F.A.
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9 – 14 ml
4 - 6 ml
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Product Operating Procedure
Degreasing
Prior to Kemchrome-340 dip job 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.
Chromatising
After water rinse the job should be dipped in 3-5% of Kemchrome-340 solution for desired coating.
Water Rinsing
Job should be rinsed properly.
Drying
After water rinsing, job should be properly dried by hot air blowing.
5.0 Product Application Equipments
S. S. tank of 3-4 mm thickness.
Testing and Control Procedure:
Free Acidity
Pipette out 5 ml of bath 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 NaOH 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 Iodide 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 thiosulphate I burette will give the total acidity of the solution.
Chemical Replenishment
Add 2.6 Ltr. Of Kemchrome-340 for every 100 ltr. Of water to raise the acidity pointage by 1. based upon organic compounds.
Safety Measures
Kemchrome-340 is based upon organic compound so while handling proper care should be taken. Protect eyes and skin by means of goggles, gloves etc. If it comes in contact with skin and eyes wash thoroughly with flush of water and get medical advice.
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