The document discusses pulsed electrodeposition technology. It describes pulsed electrodeposition as a unique non-line-of-sight electrolytic deposition technique that uses modulated currents to obtain wear and corrosion resistant nanocrystalline coatings. Key factors that affect pulsed electrodeposition include pulse amplitude, width, and the use of heated baths. The technique has applications in corrosion resistance coatings for automobiles and wear resistance coatings for industrial tools and machinery. Recent research has focused on developing nanocomposite coatings for hard chrome replacement.

1. Pulsed Electrodeposition
Technology
Mahfooz Alam
17ETMM10
M.Tech,UoH

2.  ABOUT ARCI
 INTRODUCTION OF PULSED
ELECTRODEPOSITION(PED)
 MECHANISM OF PED
 FACTORS AFFECTING PED
 DRAWBACKS
 APPLICATIONS
 MAJOR PATENTS/PUBLICATIONS
Contents

3.  International Advanced Research Centre for
Powder Metallurgy and New Materials (ARCI)
established in the year 1997, is an
Autonomous Research and Development
Centre of Department of Science and
Technology (DST), Government of India with
main campus at Hyderabad spread about 95
acres of land and with operations in Chennai
and Gurgaon
About ARCI

4.  Development of High Performance Materials
and Processes for Niche Markets
 Demonstration of Technologies at Prototype /
pilot scale
 Transfer of Technology to Indian Industry
 ARCI has successfully transferred 15
technologies to 27 receivers and few other
technologies are under transfer
About ARCI's mandate

5.  ARCI's Centre for Engineered Coatings (CEC)
has been engaged in developing a wide
spectrum of appropriate surface modification.
Some of the major coating technologies
established at CEC:
 Detonation spray coating
 Electron beam physical vapour deposition
 Cathodic arc physical vapour deposition
 Pulsed electro-deposition coatings
 Solution precursor plasma spray coating
 Cold spray coating
Centre for Engineered
Coatings(CEC)

6.  Pulsed Electrodeposition is a unique non-
line-of-sight electrolytic deposition
technique for obtaining wear and corrosion
resistant nanocrystalline coatings using
modulated currents.
 The process used in electroplating is
called electrodeposition
 Electroplating is a process that uses
electric current to reduce dissolved
metal cations so that they form a thin
Introduction

7.  Reduction of metal ions onto cathode surface
Under the influence of modulated current
 Example:
Electrical oxidation of anions on to a solid
substrate, as in the formation of silver
chloride on silver wire to make silver/silver-
chloride electrodes
 The part to be plated is the cathode of the
circuit
Mechanism

8. Mechanism

9.  A simple modification in electroplating is
pulse electrodeposition.
 This process involves the swift alternating of
the potential or current between two different
values resulting in a series of pulses of equal
amplitude, duration and polarity, separated
by zero current.
 By changing the pulse amplitude and width, it
is possible to change the deposited film's
composition and thickness
Definition of PED

10.  Non line of site process, economical and
ecofriendly
 Porosity free finished product, higher
production rates
 Control over microstructure, mechanical
properties, particle content in composite
coating
 Higher current efficiency and deposition rates
compared to traditional hard chrome process
 Easy technology transfer from research lab to
existing infrastructure
Key Features

11.  Sometimes the pulse electroplating can be
performed in heated electroplating bath to
increase the depositing rate
 Small gap to sample area ratio may cause
uneven distribution of current and affect the
surface topology of plated sample
 Stirring may increase the transfer/diffusion
rate of metal ions from bulk solution to the
electrode surface
Factors affecting PED

12.  In order to maintain the constant effective
current or potential, a high performance
power supply may be required to provide
high peak current/potential and fast switch
 Another common problem of pulse
electroplating is that the anode material
could get plated and contaminated during the
reverse electroplating, especially for the high
cost, inert electrode like platinum
Drawbacks

13.  Corrosion resistance and decorative coatings:
automobiles include car, truck trim,
motorcycle, kitchen and bathroom appliances
 Wear resistance: hydraulic actuators, railway
engine shafts, aircraft landing gears, shaft
journals, farm machinery, earth movers, snow
plows, road repair equipment, mining
equipment, automobile engine valves
 Industrial tools such as rolls for Al and steel
manufacturing, stamping tools and dies,
molds for plastic manufacturing utilized
chrome plating for increasing its (tool) life
Potential Applications

14. Applications

16. FACILITY
 Recently a new
method is invented to
deposit nanocomposite
coatings for hard
chrome replacement
with control over inert
particle content in
coating depending
upon application
requirement.
 The new
nanocomposite
demonstrated excellent
wear and corrosion
resistance in

17.  An improved method for preparing nickel
electrodeposit having predetermined
hardness gradient (Indian Patent:
IN200901455-I1)
 A method and an apparatus for preparing
nickel tungsten based nanocomposite coating
deposition (Indian Patent: 201611001190)
 Nitin P. Wasekar et al., Materials and Design,
112 (2016) pp. 140-150, Applied Surface
Science, 364 (2016), pp. 264-272, Surface
and Coatings Technology, 291 (2016) pp.
130-140, Materials Characterization, 116
Major Patents / Publications

18. THANK YOU FOR YOUR
ATTENTION …