CATHODIC PROTECTION
P E FRANCIS
CONTENTS
1 INTRODUCTION............................................................................................................2
2 PRINCIPLES OF CATHODIC PROTECTION..........................................................3
3 METHODS OF APPLYING CATHODIC PROTECTION........................................5
3.1 IMPRESSED CURRENT..........................................................................................5
3.2 SACRIFICIAL ANODES..........................................................................................6
4 DESIGN...........................................................................................................................8
4.1 PROTECTION POTENTIALS .................................................................................8
4.2 CURRENT DENSITY...............................................................................................8
4.3 COATINGS ...............................................................................................................9
4.4 CALCAREOUS SCALES.........................................................................................9
4.5 CHOICE OF CATHODIC PROTECTION SYSTEM ..............................................9
4.6 ANODE RESISTANCE ..........................................................................................10
4.7 DANGERS TO BE AVOIDED...............................................................................12