Proteção catódica

Journal of Materials Processing Technology 166 (2005) 256–267

Cathodic protection of cooling water systems and selection of appropriate materials
I. Gurrappa∗
Defence Metallurgical Research Laboratory, Kanchanbagh P.O., Hyderabad-500058, India Received 13 May 2002; received in revised form 6 January 2003; accepted 1 September 2004

Abstract The current article focuses mainly the necessity, types of cathodic protection and anodes available apart from a brief review on sacrificial and impressed current cathodic protection (ICCP) anodes. Further, the advantages and disadvantages of each are also discussed. The necessity of designing of an effective cathodic protection system for cooling waters pipelines has been emphasized. In addition, the economics of cathodic protection has been highlighted with an example. After installation of CP system, operation and maintenance part has also been mentioned. Finally, the selection of suitable materials and design for various applications has been highlighted. © 2004 Elsevier B.V. All rights reserved.
Keywords: Cooling water systems; Cathodic protection; Appropriate materials

1. Introduction Cooling water systems are essential in order to enhance the efficiency of equipment by elimination of heat from the heat exchangers. A cost-effective treatment coupled with high-performance is the requirement in the cooling water systems. A treatment package taking care of only either corrosion or fouling control or microbiological control is not sufficient. The treatment should eliminate both corrosion as well as microbiological settlement successfully, which in turn enhances the efficiency of the equipment. For effective prevention of corrosion and fouling in side cooling water systems is the use of efficient inhibitors in association with suitable non-oxidizing biocides. However, some cooling water system pipelines are buried in the soil. Soil side corrosion is imminent for such cooling water pipelines. Inhibitors and another