| Lectures: 4 Periods/Week | Sessional Marks: 30 |
| University Exam: 3 Hours | University Examination Marks: 70 |
UNIT-I
Introduction and Scope: Corrosion, definition, Wet and dry corrosion, mechanisms, Electro-chemical principles and aspects of corrosion, Faradays laws, specific conduction, specific resistance, transport no. mobility etc., various forms of corrosion, a brief review, corrosion rate expression, thermodynamic aspects of corrosion, equilibrium potential, Nernst equation for electrode potential,
EMF series, over voltage, application of Nernst equation to corrosion reactions, calculation of Corrosion Rates.
UNIT-II
Polarization and Corrosion potentials, reference electrodes for corrosion measurements, types of polarization, concentration, activation and resistance polarizations, Tafel equation, Tafel constant, Evans diagrams, anodic control, cathodic control. Mixed control: Fourbaix diagram for Fe-H2O system, galvanic corrosion, uniform attack, pitting corrosion, dezincification, cavitation erosion.
Fretting corrosion, inter-granular and stress corrosion cracking, some remedial measures for the above.
UNIT-III
High temperature oxidation, pilling bedworth ratio, mechanisms of oxidation, corrosion testing procedures & evaluation.
Corrosion of iron and steel in aqueous media, effect of velocity, temperature and composition of media.
UNIT-IV
Prevention techniques, modification of the material, alloying, appropriate surface or core treatment, chemical and mechanical methods of surface treatment.
Coatings, metallic, non-metallic linings, cathodic protection, passivity and anodic protection.
Text Books