DIAMOND CHEMICALS
Manufacturer
of acid Zinc, Nickel, Antique, Acid Gold
and Neutral Gold electro-plating chemicals, electroplating plant and it’s
equipments, plating rectifiers and heat
chambers. Offers expertise.On any kind of plating system and design of
delicate plants. Wire galvanizing plant
19,k.s.dutta road. Nimta kolkata 700049. Tel:033-25393159,Mob:9007575945
/ 9883197050
e-mail: diamondbiswas@gmail.com.
or diamondche2008@rediffmail.com
DIAMOND CZ 5081 PROCESS
(LATEST TECHNOLOGY ON ACID ZINC PLATING PROCESS)
The Diamond CZ 5081 acid Zinc process is designed to achieve
highly leveled & bright deposit over a wide range of current densities in
both rack & barrel plating operations.
This process offers following benefits to its users:-
- CZ 5081 process produces highly leveled, ductile and bright deposit over a wide range of current densities.
- CZ 5081 process readily plates on malleable iron, cast iron and heat treated steels.
- CZ 5081 process can plate easily complex shaped articles due to it’s high range of current densities.
- CZ 5081 Process is very economical as compared to cyanide bright Zing process
- CZ 5081 process indulges good receptivity to the chromate conversion .
- CZ 5081 process is governed by reduced voltage which saves approximately 30-40% of electricity bills.
- CZ 5081 process prevents pollution and costly wastes.
- CZ 5081 process reduces drastically effluent treatment cost in comparison to cyanide process
OPERATING CONDITIONS
1. Anode / Cathode ratio 2: 1
2. Temperature
20 degree-45 degreeC
3. pH value
4.8 – 5.5
4. Cathode current
density 0.
5 – 5 amp/ sq .d m
( For both vat and barrel)
5. Anode current density 1-3 amp/ sq .
dm
6. Voltage
1-4 Rack
4 – 8 Barrel
7.Agitation For
vat only
8.Filtration
Continuous
INITIAL MAKE UP RANGE OPTIMUM
1. CZ 5081 A 100 –200 ml/ l 150 ml / l
2. CZ 5081 B 230 –275 g/l 250 ml / l
3. CZ 5081 M 30-50 ml / l 40 ml / l
4. CZ 5081 R 0.4 –3 ml/ l 1 ml / l
5 .CZ 5081 C 0.4 – 3 ml /l 1 ml /1
Page 01 0f
04.
FOR CONTINUOUS
PLATING ON WIRE AND STRIPS
INITIAL MAKE UP RANGE OPTIMUM
1.CZ 5081 A 150-200 ml / l 150 ml / l
2.CZ 5081 B 230-250 g / l 250 g / l
3.CZ 5081 M 30 –50 ml / l 40 ml / l
4.CZ 5081 R 0.2- l ml / l 1 ml /l
5 .CZ 5081 C
1.5-2.5 ml / l 2 m l /l
ELECTROLYTE COMPOSITION
VAT AND
BARREL PLATING
WIRE / STRIPS PLATING
Zinc as metal 2 5 –40 g / l 35-50 g/l
Total chloride 120 –160 g / l
130-160 g/l
Boric Acid 2 5 –3 5
g/l 3 0-50 g/l
SOLUTION
PREPARATION
Rack & filter unit should be cleaned and leached with 3%
dil. Hcl For 2 –3 hours.
Remove the entire acidified water and clean the tank with de-ionised
water.
Add water into the tank up to 1/3 rd of height and then add
required quantity of CZ5081A and CZ5081 B into the vat. Stir the solution by
means of passing air until the salts are completely dissolved.
Add 3-4 ml /lit. of hydrogen peroxide and agitate the
solution for an hour .Again add 3-4 gms/lit. of Diamond activated Carbon and 10
gms. Per 100 liters of Diamond ACZ
purifier.
Keep on agitation for 2-3 hrs.and then leave the bath for
overnight for settlement.
Filter the solution and add required quantity of CZ5081 M and CZ5081R in the vat and maintain
the air agitation. The Ph of the solution should be adjusted to 4.8 –5.5. Add
potassium Hydroxide to increase up the pH value and add Hcl.to decrease the Ph
value. Now, dummy the solution for 4-5 hours at a stretch with 4-5 amperes per
sq .ft . of current densities . Now , bath is ready for production.
CONSUMPTION PATTERN OF CZ 5081 M. AND CZ 5081 R
Consumption of C2-5081 M & C2-5081 R depends on the
degree of brightness, leveling required, surface status of articles, present
parameters, Ph value, maintenance of
temperature, current densities and very importantly drag out losses. In case of
hollow items, drag out losses are more than the plain and simple items.
However, consumption of both CZ-5081 M & for every 1000
ampere hour are 100-150ml each for best conditions. In case of Rack plating,
slightly excess addition of CZ-5081 M is required for reducing burning tendency
at high current density area and to maintain the ductile deposit . Slight
excess addition ,@ 0.1-0.2 ml / l of CZ-5081 R will improve the throwing power
and coverage. Especially, in deep recession of small components in the barrel
plating.
MAINTENANCE
Replenishment of the bath must be governed by periodic
analysis report and addition of CZ-5081A and
CZ-5081 B to be made accordingly.
Excess addition of CZ-5081 M and CZ-5081 R should be governed by hull cell test
performance.
Page 02 0f 04.
PROCESS CYCLE
1. Hot soak
clean
1 1. Water rinse
2. water rinse 1 2. 1-2% nitric dip.
3. Anodic cleaning
30-80 amp/sq.ft 1 3.
water rinse
4. Water rinse
1 4. Passivation
5. DO
1 5. water rinse.
6. 50% Hcl Dip. 1 6. Hot water
rinse
7. Water rinse
1 7. Drying
8. Do
9 . CZ 5081 Process (Chloride Zinc plating )
10. CZ 5081 Drag out
ANALYTICAL METHOD FOR ACID ZINC PLATING SOLUTIONS.
ZINC AS METAL
Reagents required.
1) Eriochrome BLACK
T indicator. (Mix 1 gm
Erichrome Black T with 100 gms.
AR . grade sodium Chloride .)
- Ammonia –Ammonium chloride Buffer soln.
- E D T A Solution.
Dissolve 37.5 gm AR grade EDTA and
make up the level to a litre .
PROCEDURE
a) Pipette
out 2 ml .solution into a 250 ml conical flask
b) Add
20 ml. Ammonium Chloride buffer soln.
c) Add
a pinch of diluted Eriochrome Black T indicator
d) Titrate
with 0.1 M EDTA Solution to a blue and point.
CALCULATION
Burette reading X 3.269= g/l of zinc as Metal.
TOTAL CHLORIDE
Reagents required
1) Calcium
Carbonate.
2) Potassium
Chromate as Indicator (Dissolve 50 gms of potassium Chromate in a litre of
water ).
3) 0.1
N Silver Nitrate soln. (Dissolve 17.5
gms of AgNO3 in a litre of water. Store in a brown glass bottle or black poly
bottle).
PROCEDURE
1)Pipette
1 ml solution into a 2 5 0 ml conical flask.
2)Add potassium chromate indicator till
solution is distinctly yellow.
3)Titrate with 0.1 N AgNO3 till reddish ting
appears on the precipitate
Page 03 of
04
CALCULATION
Burette reading x 3.546 =gm / l chloride (Total)
TOTAL ZING CHLORIDE
Gm / lit of zinc as metal x 2. 0 8 5= gm /lit of Zinc
chloride.
TOTAL KCL
Gm / l of Zinc chloride x 0.5203 =gm / l of chloride in Zinc
chloride.
(Total chloride gm / l of chloride in zinc chloride) X 2.10=
KCL gm / l.
BORIC ACID
Reagents required
1) 0.1 N
Sodium Hydroxide. (Dissolve 4.0 gm of AR grade Sodium Hydroxide in
distilled water up to 1 litre.
Standardize against Sulfuric Acid of known strength.)
2) Bromocresol purple indicator.(Dissolve 0.1
gm of Bromocresol purple salt in 18 ml
of 0.01 N Sodium Hydroxide and dilute it to 250 ml with distilled water.
3) Mannitol AR Grade
PROCEEDURE .
1) Pipette
out 1 ml of sample solution into a 250 ml Erlenmeyer flask and add 2-5gms of
Mannitol and shake well.
2) Add
a few drops of Bromo-cresol purple soln.
3) Titrate
against 0.1N NaOH with continious stirring. End point – purple.
CALCULATION
Burette reading
x 6.184 =gm / l of Boric Acid .
IMPORTANT NOTE
Diamond chemicals give no warranty, express or implied and
all products are sold upon conditions that purchasers will make their own test
to determine the suitability of the product. We cannot warrant that our
customer will achieve the same results from any bulletin because ,we do not
have control over the conditions of use ,nor can we assume any responsibility
for our customer’s use of any of our products. Any information or suggestions
given are without warranty of any kind and purchasers are solely responsible
for any loss arising from the use of such information or suggestions.