Handbook of Cathodic Corrosion Protection.pdf

This handbook deals mainly with the practice of cathodic protection, but the discussion includes fundamentals and related fields as far as these are necessaiy for a complete review of the subject. We thought it appropriate to include a historical introduction in order to explain the technological development of corrosion protection. The second chapter explains the theoretical basis of metal corrosion and corrosion protection. We have deliberately given practical examples of combinations of various materials and media in order to exemplify the numerous fields of application of electrochemical protection. At present cathodic protection is only generally applied for materials in contact with natural waters and soil, but future applications are envisaged for industrial plants and containers. For this reason we have included a chapter on anodic protection that has been applied in isolated cases during the past 10 years. Ca-thodic and anodic protection are basically very similar systems and justify the description electrochemical protection in the subtitle of this book. Most applications combine cathodic protection with a surface coating. The chapter on physical protection systems seemed appropriate because of the various interactions that must be taken into account. A chapter on general measuring technology has also been added since the practice of cathodic protection has repeatedly shown the importance of a careful study of measuring problems. It requires experience to account for possible sources of error in calculations, and it is always necessary to check unusual measured results by independent monitoring. Impressed current installations present particular measurement problems, keeping in mind that an installation with reversed polarity generates intensive corrosion. This is worse than an inoperative system or no corrosion protection at all...