17 - Industrial Tests and the Introduction Into Electrochemical Plants of the Developed Methods for the Protection of Metals Against Corrosion Attack by Leakage Currents

Abstract

Results of the industrial tests made possible successful introducing the developed methods for the protection of metals against corrosion by leakage currents into electrochemical plants. The chapter provides concrete examples of protection by current leak-off anodes of the following titanium equipment at the diaphragm electrolysis plants: headers, covers and overflows of electrolyzers, brine heaters, etc. Protection of relatively small equipment, for example, titanium valves, can be accomplished by coating of a part of the surface area of this equipment. In this case the coated areas act as current leak-off anodes. Protection of stainless-steel pipelines is curried out with anodes oriented in the field of the external current. Protection of pipelines from corrosion by cathodic external currents and combined protection from the attack by both, anodic and cathodic external currents are also considered. Possibility of using the developed methods for protection against corrosion by stray currents is discussed.