22

Concentric Neutral Corrosion

William A. Thue

CONTENTS

22.1    Introduction

22.2    Electromotive Series

22.2.1    Electrochemical Equivalents

22.2.2    Hydrogen Ion Concentration

22.3    Mechanism of Corrosion

22.4    Types of Corrosion

22.4.1    Anodic Corrosion (Stray Direct Current Currents)

22.4.2    Cathodic Corrosion

22.4.3    Galvanic Corrosion

22.4.4    Chemical Corrosion

22.4.5    Alternating Current Corrosion

22.4.6    Local Cell Corrosion

22.4.7    Other Forms of Corrosion

22.5    Concentric Neutral Corrosion

22.5.1    Research Efforts

22.5.2    Composition of Soils

22.5.3    Mechanisms of Concentric Neutral Corrosion

22.6    Jackets

22.7    Cathodic Protection

22.8    Location of Corrosion Sites

22.8.1    Resistivity Measurements ...

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