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07244 Mitigation of Galvanic Corrosion in Seawater Piping Systems

Picture for 07244 Mitigation of Galvanic Corrosion in Seawater Piping Systems
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Results of laboratory testing of a new technology for mitigating galvanic corrosion. Incorporated into a device, referred to as the galvanic corrosion inhibiting coupling (GCIC) or bi-electrode device (BED), it creates an ohmic potential drop within the pipe and minimizes the polarization of the dissimilar metals.

Product Number: 51300-07244-SG
ISBN: 07244 2007 CP
Author: Brett M. Tossey and John A. Beavers
Publication Date: 2007
Industry: Cathodic Protection
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Dissimilar metal couples are frequently found in seawater piping systems, as a result of the desire on the part of designers to use the beneficial properties of different alloys for different components in the systems. For example, copper base alloys have natural antifouling properties, which make them desirable for use in piping systems. Titanium alloys, and nickel base alloys containing molybdenum are highly resistant to localized corrosion and are frequently used in thin wall heat exchangers. The presence of these dissimilar metal couples can lead to serious problems with galvanic corrosion of the more active members of the couples. This paper summarizes the results laboratory testing of a new technology for mitigating galvanic corrosion. The technology has been incorporated into a device, referred to as the galvanic corrosion inhibiting coupling (GCIC) or bi-electrode device (BED), which creates an ohmic potential drop within the pipe and minimizes the polarization of the dissimilar metals from their respective corrosion potentials.

Keywords: seawater piping corrosion, galvanic corrosion mitigation, titanium, Alloy 625, copper-30 nickel

 

Dissimilar metal couples are frequently found in seawater piping systems, as a result of the desire on the part of designers to use the beneficial properties of different alloys for different components in the systems. For example, copper base alloys have natural antifouling properties, which make them desirable for use in piping systems. Titanium alloys, and nickel base alloys containing molybdenum are highly resistant to localized corrosion and are frequently used in thin wall heat exchangers. The presence of these dissimilar metal couples can lead to serious problems with galvanic corrosion of the more active members of the couples. This paper summarizes the results laboratory testing of a new technology for mitigating galvanic corrosion. The technology has been incorporated into a device, referred to as the galvanic corrosion inhibiting coupling (GCIC) or bi-electrode device (BED), which creates an ohmic potential drop within the pipe and minimizes the polarization of the dissimilar metals from their respective corrosion potentials.

Keywords: seawater piping corrosion, galvanic corrosion mitigation, titanium, Alloy 625, copper-30 nickel

 

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