JNTUK B.Tech Corrosion & Its Control gives you detail information of Corrosion & Its Control R13 syllabus It will be help full to understand you complete curriculum of the year.
Learning Objectives
- Basic concepts of material damage/degradation, its scope, and maintenance of chemical equipment will be known.
- To learn a model of electrochemical corrosion cell – this will give the basic concepts on corrosion processes occurring between Metal/Material and environment.
- To know different types of aggressive environments generally one comes across; to give the idea about how the surface of the metal/material interacts with the environments (Liquid, Gas & Solid environments).
- To train the students in the evaluation of corrosion rates, this will give the concepts of quantitative estimation for subsequent applications of remedial measures.
- To make the student conversant with the various corrosion testing methods in practice along with the latest methods developed such as impedance method, linear polarisation technique etc.
UNIT-I: Introduction: Corrosion and oxidation, Cost of corrosion – Direct and Indirect losses due to chemical corrosion; Definitions – Extractive Metallurgy in reverse – Dry corrosion, wet corrosion – Electro chemical cell as corrosion cell – Electrochemical Mechanism of corrosion – Corrosion cells.
Corrosion Reactions: Metal / Environmental, anode, cathode and the corresponding electrode reactions – Metallurgical aspects of corrosion. Mixed potential theory of corrosion/ Modern Theories in brief.
UNIT-II: Corrosion Cell and Electrochemical Polarisation, over-potential/ over-voltage: Potential – current diagrams (EVANS diagrams)–Electrode potentials–EMF series–Galvanic series– Corrosion potential–Corrosion current density–Thermodynamics of corrosion as irreversible electrode process, Tafel equation for over-voltage and evaluation of corrosion rates from current – potential data;,– Corrosion rate expressions: ipy (inches per year penetration), mpy (mils per year), mdd (milligrams per decimetre square per day).
UNIT-III: Forms of corrosion: Basis on which the corrosion processes have been categorized: Uniform attack: A hypothetical case for comparison – Pitting factor, Examples for uniform attack Localised corrosion: Pitting corrosion, crevice and gasket corrosion-Formation of micro climates – Filiform corrosion.
Galvanic corrosion: Electro chemical – Application of EMF in Galvanic series: Dezincification, bimetallic corrosion (two metal corrosion) – Differential concentration, differential temperature and differential stress corrosion cells. Application of Galvanic corrosion for parting and separation
UNIT-IV: Forms of Corrosion: Grain–Grain boundary corrosion–Intergranular Corrosion (IGC) in stainless steel (SS)–Weld decay, knife line attack – Remedial measures for IGC. Stress corrosion cracking (SCC)–Caustic cracking (Boiler corrosion), hydrogen damage, hydrogen embrittlement, season cracking of brasses and other alloys – Remedial measures. Fatigue Cracking–Fatigue failures in corrosive media–Remedial measures.
UNIT-V: Corrosion Testing: Testing Panels/specimens –Preparation–Surface preparation of specimens for testing–Testing media–Static and flow of dynamic test–Effect of flow, oxidiser concentration, temperature and medium concentration.
Testing Methods: Weight loss method, corrosion rates evaluation using Faraday’s laws, linear polarization techniques from current potential data–Rapid estimation of corrosion rate–Corrosion measurements gadgets–such as pitting gauge–Corrosion rate data representation–Nanographs.
UNIT-VI: Corrosion Control: Organic coatings (paints, varnishes, lacquer, anti–corrosive paints) Inorganic – Chemical conversion coatings such as, Anodizing, Phosphating, Chromating – Metallic coatings; Cladding; Design considerations–Equipment & Layout Design for easy access; Linear polarization for rapid estimation of corrosion rate; Impedance method in brief. Cathodic protection–Anodic protection–Materials: New materials for corrosion prevention, Alloys – Composite structure – Particulate composites. Corrosion inhibition using Corrosion inhibitors – Modification of medium.
Outcomes
- Definitions and economic aspects would give the students a wide scope about this topic.
- Mechanism will give the student basic chemical reactions resulting in oxidation and corrosion.
- Various types of corrosion have been discussed; all these are mostly encountered in the industrial practice. This helps the students to diagnose the type of corrosion, its consequences in the deterioration of the material and its properties.
- Remedial measures and corrosion mitigation techniques, helps the student to apply the principles while designing the equipment.
- The students will be able to choose a suitable material for a given situation and apply the techniques for the protection of the material/equipment/devices.
- Students can apply the inhibition methods to modify the medium or the equipment to increase the life/longevity of the component/structure/equipment/device.
Text Books
- Corrosion and Corrosion control, Herbert H. Uhlig & R. Winston Revie, 4th Edition, John Wiley & Sons, 2008.
- Corrosion Engineering, Mars G. Fontana, 3rd Edition, Tata McGraw-Hill, 2005.
- Hand book of Corrosion Engineering, H H Uhlig, 3rd Edition, John Wiley & Sons, 2011.
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