Chromium plating on ABS plastics. Inspired from Habigong Industrial park. We paid a visit To HIP. And after visiting it was made for my presentation.

1. Presented By:
Saad Bin Hasan
B.Sc in Chemical Engineering,
Jessore University of Science & Technology

2. Raw Materials:
 Acrylonitrile-butadiene-styrene (ABS) Plastics
 Copper
 Nickel
 Chromium
Product:
Chromium Plating on ABS Plastic

3. Flow of Chrome plating
process:
ETCHING
NEUTRALIZING
ACTIVATION
ACCELERATION
ELECTROLESS PLATING
ELECTROPLATING

4. Etching:
 The bath consist of highly concentrated
acid solution of chrome and sufulric
acid.
 Operate at the temperature between 50
°C and 70 °C.
 Carried out around 1-10 min.
 Organic solvent and solvated hydroxyl
ions to etch the surface of the part to
improve adhesion of a metal coating
with the part.

5. Neutralizing:
 Rinsed in water and then put into a
neutralizer.
 Materials such as sodium bisulfite that
are designed to eliminate excess
etchant from the parts and racks, usually
by chemical reduction.
 Carried out around 1-10 min

6. Activation:
 Used to activate the part using activation
bath.
 Activation is done by seeding the
surface with a catalytically active metal,
usually from palladium.
 Carried out around 3-5 min.

7. Acceleration:
 Accelerator bath is typically mixture of
organic acid solution.
 Carried out around 3-5min.
 Function of this bath is to remove the
excess palladium nuclei which have
been deposited in the part to promote
quicker reaction initiation in the following
electroless deposition step.
CuSO4 + 2HCHO + 4NaOH → Cu + Na2SO4 + 2NaCOOH + 2H2O + H2
NiSO4 + 3NaPO2H2+ 3H2O → Ni + 3NaH2PO3 + H2SO4 + 2H2

8. Electroless plating:
 To make electrically conductive to
electroplating.
 Coated by Copper and Nickel by chemical
dipping process.
 Nickel and Copper is applied over the
activated palladium layer.
 Chromium can be easily electroplated on the
surface of the part.
 Carried out around 3-5 min.
 Bright Acid Copper has two main functions
(ductility & leveling) in the plating on plastic
line.

9. Electroplating:
 Final stage in the
chrome plating process.
 Chromium is coated on
the part which have
been plated in the
electroless plating.
 Carried out around 3-5
min.
 Hexa valent chromium
is the source chromium
and catalyst is used.
 Most common catalyst
is sulfate and mixed
catalyst is used in some
special properties. Fig: Electroplating process

10. After Electroplating:

11. Thank You