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Electro-Plating (355)
1. INTRODUCTION
Electro-Plating may be defined as the Science and art of electro
deposition of relatively thin film of an adherent metallic coating upon an
electrode for the purposes of securing a surface with properties or dimensions
different from those of the base metal.
Keeping in view of readership of the module, every effort has been made to
present the subject matter in simple language and style. Various steps for
plating processes have been outlines to lend clarity to the subject.
2. OBJECTIVES
After going through this course the student will be able to:
understand the principle of electroplating
understand the process of electropating for various metals.
3. JOB OPPORTUNITIES
The pass-outs of this course have ample scope to secure wage employment in
industry as there is sufficient demand for professionally qualified and skilled
electro-plators in various industries in both rural and urban areas. One can
also start his/her own electro-plating shop.
4. Course duration
One Year
4.1 Scheme of study – Theory 40%, Practical 60%
5. Entery Qualification
Class 8th Passed
6. SCHEME OF EXAMINATION
Maximum Weightage in Theory – 30, Time – 2 hours
Maximum Weightage in Practical – 70, Time – 3 hours
Passing Marks – 33% seperately in Theory & Practical in the Public Examination
for Sr. Secondary level or Grade 'E' as for independent vocational course
or Grade 'G' when combined with academic stream.
7. COURSE CONTENTS
1. Corrosion
Corrosion: Definition, its effects, Types of corrosive attacks, Electrochemical
corrosion: its components, Various forms of corrosion, Uniform corrosion,
Pitting Corrosion, Intergrannular corrosion, Stress corrosion, Erosion corrosion,
Corrosion fatigue, Factors influencing rate of corrosion, Corrosion Control
2. Electro-chemistry
Electro-chemical Reaction, Electrolysis of Molten electrolytes, Electrolysis
of aqueous Solutions, Faraday’s Laws, Applications, Electrical Conductivity
of electrolytic solutions, Molar Conductance of an electrolytic solution,
Strong and Weak electrolytes
3. Electro-Plating
Principle of electroplating, Rate of deposition, aims and importance
4. Metal Surface preparation and cleaning - chemical cleaning
Metal Surface preparation and Cleaning, Chemical Cleaning, Solvent cleaning,
Cold solvent cleaning, Vapour degreecing–, (a) Petroleum Solvents, (b) Chlorinated
Solvents, (c) Emulsifiable Solvents, Alkaline cleaning (Detergent cleaning),
(a) Immersion cleaning, (b) Spray cleaning, (c) Electrolytic cleaning, (d)
Ultra sonic cleaning, Acid clearner, (a) Acid pickling, (b) Bright dipping
5. Metal Surface preparation and cleaning - Salt bath cleaning
Salt bath cleaning, Sodium hydroxide bath, Sodium hydroxide bath with additives,
Electrolytic bath
6. Metal Surface preparation and cleaning - Mechanical cleaning
Rust Remover, Mechanical Cleaning, (a) Polishing, Polishing Wheels, Adhesives,
Abrasives, Abrasive belts, Lubrication, (b) Brushing, (c) Buffing, Buffing
wheels, (d) Polishing Components, 1. Bar Components, 2. Liquid-spray buffing
composition, (e) Electro-Plating, Basic of Electro-Plating Bath, Preparation
of bath.
7. Electro-Plating Sequences
Electro-Plating Sequences, Preliminary Treatment, Plating of Low carbon steel,
Nickel Plating, Copper Plating, Chromium Plating, Silver Plating, Gold Plating,
Plating of copper and copper base alloys, Silver plating on copper and copper
base alloys, Gold plating on copper and copper base alloys, Properties of
electrolyte solutions’, Composition of various salt solution, Zinc plating,
Tin plating, Tin Immersion solution
8. Electroplating on Plastices
Electroplating on plastics, Cleaning, Etching, Neutralizing, Catalyzing, Accelerating,
Electro-less plating, Electro-plating
9. Electro-plating Equipment
Electro-plating equipment, Process tanks, (i) Welded steel tank, Rods and
connections for process tank, Container hook materials, i) Copper, ii) Brass,
iii) Bronze, iv) Aluminimum, v) Monel metal, vi) Nichrome, Solution heating,
Agitation of plating solution, Filtration of plating solutions, Drying equipment,
Electrical equipment (redifier)
10. Major defects in plating
Major defects in plating, Causes of defects, Embossing process
11. Safety precautions in Electro-plating
Safety precautions in electro-plating, Applications of electro-plating
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