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Kemphos-327
(Self-Accelerated Heavy Zinc Phosphating Chemical)
Product Description
Kemphos-327 is a self accelerator zinc phosphating process, which is
specially formulated to produce medium to heavy weight coating on iron and steel surface by hot immersion method. Kemphos-327 is
recommended for wide range of ferrous metal articles such as car
accessories, metal cores, forge and cast iron components, small
component parts such as nut, bolts, etc. Kemphos-327 protects Iron
and steel surfaces from rusting medium weight coating gives a very
good foundation for paint system and protects under film corrosion.
Heavy weight coatings provides excellent base for stains and are also
recommended for small component parts for rust protection with
minimum build up on thread parts.
Product
Specifications
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a.
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Colour
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Light Pale Yellow Liquid
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b.
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Chemical Composition
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Blend of soap powders, 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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Concentration
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4.5 litres to 5 litres of Kemphos-327 100 litres
of bath.
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Pointage
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36 -40 ml
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Iron content
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0.05 0.4%
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Temperature
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80 - 90°C
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Immersion
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For Medium Weight coating
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5 -10 minutes
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For Heavy weight coating
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20 40 minutes
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Product Operating Procedure
The
article to be processed in the Kemphos-327 solution be free from
oils, grease, dusts, rust and scales etc.
Degreasing
Remove
all oils and grease by emulsion cleaning by trichloroethylene vapour
degreasing or by solvent wiping. Through rinsing should be followed:
wherever necessary after degreasing.
Derusting
Remove
rust and scales present on the articles to be processed by immersion
in Kemklin HD. If scales are heavy the articles should beaded by shot
blasting or by pickling. After pickling rinsing should be carried out
in two stages.
Phosphating
Immerse
the components in Kemphos-327 bath for 5 to 40 minutes at
80-85°C temperature. Immersion time depends on the type of
coating weight required. Medium weight can be produced by immersion
for 3 - 5 minutes which serves a good base for under gloss paints
Heavier coatings with kemphos-327 can be obtained by Immersion for 20
40 minutes which increase corrosion resistance. Rinse the
phosphated articles in cold running water followed by hot water rinse
to accelerate drying.
Passivation
Articles
should be passivated by immersion in hot kemlyte-333 solution at
70°C for 30 seconds to 1 minute.
Drying
After
persisted the articles should be dried immediately drying can be
done inside a hot air circulating oven or by means of compressed air.
Fill
the tank 2/3 with water and add 4.5 to 5 liters of Kemphos-327 per
100 liters of bath. Fill the tank upto its operating level and stir
the solution thoroughly.
Heat
the bath to 80 degree c and add few kgs. Of degreased iron scrap or
steel wool. After 15-20 minutes when the gassing has been ceased,
remove the metal and check iron percentage. Ferrous Iron
concentration should be 0.05% minimum. Otherwise repeat the
operation.
In
case Iron contents increases beyond 0.4% add 2 liters of Kemphos-003
per 100 liters of bath to bring down iron contents and check the bath
pointage if required. Adjust the pointage of bath to working
condition by adding (Kemphos-327). Heat the bath to the operating
temperature Kemphos-327 bath can be easily controlled within the
operating limits by simple titration and maintained by periodic
additions of Kemphos-327.
Product Application Equipment
Kemphos-327
tank should be fabricated with 3 to 4 mm thick M.S. Plates with
continuous convection current hating system.
Testing and Control Procedure
Total
Acidity
Pipette
out 10 ml. Of the bath solution in a clean 100 ml beaker or conical
flask and add 2 to 3 drops of Indicator Phenolphthalein and titrate
against N/10 NaOH solution to a pink end point. The number of Mis.
Required represent the total acid pointage. Bath pointage should be
maintained between 36 40 ml. Add 125 ml of Kemphos-327 per 100
liters of bath for each pointage below 30.
Ferrous
Iron Concentration
When
the components are processed in Kemphos-327 bath some ferrous ions
are found in bath. Where bath is not heavily loaded or intermittently
used, the ferrous ion concentration remains constant at 0.04% and
need not to be measured, if the bath is heavily loaded the ferrous
ion concentration is controlled by adding accelerator to maintain the
accelerator pointage.
Chemical Replenishment
Restore the bath to the working level by adding water to makeup
evaporation loss and drag out losses. Check the Kemphos-327 pointage.
Safety Measures
Kemphos-327 is an acidic liquid
material, and while handling proper care should be taken. Protect
eyes and skin by means of goggles, aprons, gloves, etc. If it comes in
contact with skin and eyes wash thoroughly with flush of with water and
get medical advice.
General Information
Corrosion Resistance: Good
Paint Adhesion: Good
Gloss Retention: Good.
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