Electrochemical kinetics - KAMA7M16

Goal(s)

Corrosion

Content(s)

General introduction: cost of corrosion and issues

Part I: Basics and reminders of electrochemistry

I. Some definitions

II. Nernst's Law

III. Nernst's Law Application: E-pH Charts

IV. Gamma Rule: Spontaneous Reactions

V. Non-equilibrium system
1. Faradic yield
2. Curves intensity - potential
3. Plotting curves I = f (E)

Part II: Electrochemical Kinetics: Theoretical Aspects

I.Transfer of pure charge: Butler-Volmer's law
1. Butler-Volmer's Law
2.The limiting laws: Tafel straight lines and Polarization resistance
3. Polarization curves in pure transfer regime

II.Pure circulation scheme: Fick's law
1.Expression of concentration and diffusion layer
2.Exchange current density
3. Limit current density
4.Control of hydrodynamic conditions

III.Mixed schemes
1.Equation i = f (
?)
2. Rp determination of the electrode

IV.Determination of kinetic parameters
1.Cas of a pure load transfer regime
2. Diffusion correction: mixed transfer

V. Multiple electrodes
1. Competitive and non-competitive processes
2.Non-Competitive Process-Mixed Voltage

VI. Systems in operation
1.Generator operation
2.Receiver operation

Part III.Corrosion of metals

I.Thermodynamic corrosion
1.Prevision of corrosion
2.Diagrams of Pourbaix

II.Electrochemical kinetics of corrosion

III.Mechanisms of cathodic processes

IV.Measurement of corrosion rate
1.Graphic method
2. Mass loss
3.Polarization resistance to corrosion potential

V.The different types of corrosion
1. Uniform or generalized corrosion
2. Galvanic corrosion
3.Passivation of metals
4. Localized corrosion by sting
n 5. Differential aeration corrosion
6.Corrosion under stress

VI.Protection against corrosion
1.Passivation treatment
2. Protective clothing
3.Modification of the environment
4. Corrosion inhibitor
5. Sacrificial Anode and Cathodic Current Protection

Redox reaction, Nerst law, E-pH Diagramm, Faradya law