The purpose of this book is to introduce mathematical and engineering ap-proximation schemes for describing the thermodynamics and kinetics of elec-trochemical systems, which are the essence of corrosion science. The text in each chapter is easy to follow by giving clear definitions and explanations of theoretical concepts, and full detail of derivation of formulae. Mathematics is -kept simple so that the student does not have a stumbling block for understanding the physical meaning of electrochemical processes, as related to the complex subject of corrosion..