JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Course Objective

This course is designed to review the fundamental aspects of

electrochemistry and its application for metal extractions. It also focuses on various forms of corrosion, and their impact on life of metallurgical components, means and ways to engineer corrosion.

Course Outcome

At the end of this course, the student will be able to control the process

variables like current efficiency, current density to obtain an efficient electro deposition. Also, the student will have through understanding on the corrosion aspects which will enable them to engineer corrosion

UNIT - I

Review of electrochemical Principles. –Faraday’s laws-Electrode potentials – Cathodic and anodic reactions- polarization over voltage. Current efficiency, throwing power and its evolution, electro plating of Cu, Ni, Cr, Zn and alloy plating. Structure and properties of electro deposits, Testing methods of electro deposits.

UNIT - II

Electrochemical aspects of Corrosion, Corrosion Cells/Electrochemical Cells, Concentration Cells, Temperature Cells; Determination of electrode potential, Thermodynamic aspects, Nernst equation. Principles of Corrosion, Exchange Potential Theory, Pourbauix Diagram, Passivity diagrams, Polarization resistance, Linear Polarization Technique. Corrosion rate calculations.

UNIT - III

Classification, forms of corrosion. Uniform corrosion, galvanic corrosion and galvanic series. Beneficial applications of galvanic corrosion, pitting corrosion, season cracking, dezincification. Crevice corrosion, stress corrosion cracking, Intergrannular corrosion, weld decay, Knife-line attack, Erosion corrosion, frettling corrosion.

UNIT - IV

Corrosion protection methods, selection of materials for corrosion services, selection of environment-use of inhibitors, surface protection methods including painting, metallic coating. Cathodic protection, sacrificial anode.

UNIT - V

High Temperature Corrosion, Oxidation, Pilling Bed-worth Ratio; practical examples of high temperature oxidation- oxidation resistance materials and coatings, Sulphidation

R16 B.TECH METALLURGICAL AND MATERIALS ENGG.

TEXT BOOKS:

• 1. Principles of Electroplating and Electroforming - William Blum
• 2. Corrosion Engineering-Mars G. Fontana

REFERENCES:

• 1. Electroplating: Basic Principles and Practice - Kanan. N (Elsevier) 2004
• 2. Corrosion and Protection – Einaravrdet (Spinger) 2004 R16 B.TECH METALLURGICAL AND MATERIALS ENGG.