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Kemphos-531
(Manganese
Phosphating Chemical)
Kemphos-531 is specially formulated
to produce Iron Manages, Phosphating coating on Iron and steel
surfaces. This process is used for a wide variety of Industry and
application in the treatment of precision components, like Gears,
Pistons and rings, Cylinder, Liners, Bearign Surfaces, Military
Vehicles, Airplanes, Connecting Rods and host of the other
Industrial products find its immense use of ferrous materials when they
are fabricated. It reduces wear and tear of moving parts, inhibits
corrosion and reduces friction among moving parts.
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, manganese, activators, nitrates 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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8 10% v/v
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Pointage (T. A.)
(F.A.)
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32 38 ml.
4 6 ml.
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Temperature
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95 - 98oC
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Time
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15 20 min.
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Product Operating
Procedure
Completely degreased, derusted
components should be dipped or immersed in Kemphos-531 solution and
keep the temperature at 95 98°C
for 15 minutes till gassing stops. Excessive etching of the metal
surface is likely to take place, which is caused by excessive free
acid and which should be controlled.
The
most important factor before Kemphos-531 operation is that the
components should be cleaned well, which will effects the grain size
of the Kemphose-531 manganese phosphating coating. It should be
absolutely free from oils, soils and rust.
Product
Application Equipment's
Kemphos-531
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 Bath sample of Kemphos-531 solution into 250 ml conical
flask, add 5 drops of indicator Phenolphthalein. Titrate it against
N/10 NaOH till the pink colour appear. T.A. Should be maintained
between 32 to 38 ml.
Free
Acidity
Pipette
out 10 ml of running bath (Kempjhos-531) solution in 250 ml conical
flask add 3 - 4 drops of Bromo phenol blue Indicator then titrate it
against with N/10 NaOH from greenish yellow colour to sky blue
colour.
Normally
the free acid is maintained between 4-6ml.
The
ratio of the total acid is important and should be maintained within
1:6 1:8. Use this formula to maintain the ratio.
Ratio:
Total
Acidity/Free
Acidity.
Iron
Contents
Pipette
out 10 ml of the bath solution sample of (Kemphos-531) into 150 ml
beaker, add 2 ml of 50% H2SO4.
Then
titrate it with N/10 KmnO4
solution
to a permanent pink colour. The ml of KmnO4
solution
will indicate the percentage of the Iron in the bath. The normal
range is 0.15 to 0.23% Iron.
Generally,
Iron contents increase gradually in the running bath and it has to be
reduced to a required range. In order to obtain a good and smooth
coatings. To reduce the iron contents by 0.5% add 50 gm. Of 35% H2O2
(Hydrogen
Peroxide) per 100 liters of solution.
When
Iron Content Reduces
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Add
required amount of 35% H2O2 Dilute with water prior to addition to
the bath.
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Let
it react for 15 minutes.
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Add
required amounts of (Kemphos-531) neutralizer make into a slurry from
prior to addition.
- Let
it react for 15 minutes.
- Again
check up the iron content and repeat the procedure. The very
important thing is to maintain the temperature between 95 to 98oC.
Prior to, commencing any production. Let the sludge settle
at the bottom to follow this method. Discard the bath when Iron
concentration reachs beyond 7 to 8%.
Chemical
Replenishment
Since there is a continuous sludge
generation in phosphating bath due to phosphating of ferrous metal
surface the bath should desludged periodically and chemical
concentration should be replenished by adding chemical to achieve
specified bath pointage.
Safety
Measures
Kemphos-531
is an acidic liquid material, and while handling proper care should
be taken, protect eye, skin by means of goggles, aprons, gloves etc.
It comes in contact with skin and eyes wash thoroughly with flush off
water and get medical advice.
General
Information
Corrosion
Resistance: Excellent.
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