JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Overview

Course objectives: To familiarize the student with the extent and importance of material degradation. To study various aspects of corrosion and its control.

Course outcomes: After completing this course, the student should be able to:

• 1. Explain the importance of studying corrosion
• 2. Describe the thermodynamic aspects of corrosion
• 3. Describe the kinetic aspects of corrosion
• 4. Indicate the various forms of corrosion
• 5. Explain the measurement and control of corrosion.

UNIT - I

Introduction, Definition, Fundamentals of electrochemistry principles, Forms of environmental degradation, Classification of corrosion, Importance of corrosion studies and cost of corrosion. Corrosion principles, Electrochemical aspects, Thermodynamic aspects of corrosion – Gibbs energy and electrochemical potential

UNIT - II

Metal-Electrolyte Interface, EMF series, Nernst relationship and Pourbaix Diagram, Kinetic aspects of corrosion: Corrosion rate, Current density, Exchange current density, Mixed potential theory, Polarization and Passivation.

UNIT - III

Forms of corrosion: Uniform Corrosion, Localized Corrosion; Pitting; Crevice Corrosion, Galvanic Corrosion and Protection; Concentration Cells, Intergranular Corrosion; De-alloying, Environmentally assisted failures (SCC, Hydrogen embrittlement; corrosion fatigue, Erosion; Fretting. Experimental methods to identify corrosion susceptibility

UNIT - IV

Corrosion Measurements and Corrosion Control: Exposure studies, Electrochemical work bench, DC and AC methods of testing, Polarization measurements- Corrosion rate assessment by Tafel’s extrapolation method, Linear polarization resistance (LPR). Coatings, Inhibitors, Cathodic and Anodic protection.

UNIT - V

Degradation of polymeric and composite materials and its prevention

TEXT BOOKS:

• 1. Corrosion Engineering, Mars. G. Fontana, McGraw Hill Education, 2017
• 2. Electrochemical Techniques in Corrosion Science and Engineering. R.G. Kelly, J.R. Scully, D.W. Shoesmith, R.G. Buchheit, CRC Press., 2002

REFERENCE BOOKS:

• 1. Corrosion: Metal / Environment Reactions, Volume 1, L.L. Shreir, R.A. Jarman, G.T. Burstein, Butterworth-Heinemann, 1994.
• 2. Principles and Prevention of Corrosion, Denny A. Jones, Pearson, 1995. R18 B.TECH MME III YEAR