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06282 GALVANIC CORROSION ASSOCIATED WITH STAINLESS STEEL AND Ni-ALLOY COUPLES IN SEAWATER

Picture for 06282 GALVANIC CORROSION ASSOCIATED WITH STAINLESS
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Product Number: 51300-06282-SG
ISBN: 06282 2006 CP
Author: R. M. Kain, K. L. V asanth
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Because of its inherent corrosion resistance and non-magnetic properties, high alloyed austenitic stainless steel is being evaluated by the U. S. Navy for a full-scale ship structure. While other potential issues such as susceptibility to localized corrosion, marine fouling and conditions leading to liquid metal embrittlement have been discussed elsewhere, the investigation described here-in addresses the question of galvanic corrosion; in particular that associated with the welding of the candidate stainless steel UNS N08367 to itself and also to the more conventional high strength DH36 ship steel with nickel alloy UNS N06022 filler. Results of a 92-day natural seawater test comprising exposure of directly welded and electrically coupled specimens in nominal 1:1 and 10:1 surface area ratio configurations are presented and discussed. Comparisons are made with other previously reported tests comprising other stainless steel and carbon steel couples.

Keywords: Seawater, galvanic corrosion, 6 Mo alloy UNS N08367, DH36 steel UNS K02300, nickel alloy UNS N06022 welds, area effects
Because of its inherent corrosion resistance and non-magnetic properties, high alloyed austenitic stainless steel is being evaluated by the U. S. Navy for a full-scale ship structure. While other potential issues such as susceptibility to localized corrosion, marine fouling and conditions leading to liquid metal embrittlement have been discussed elsewhere, the investigation described here-in addresses the question of galvanic corrosion; in particular that associated with the welding of the candidate stainless steel UNS N08367 to itself and also to the more conventional high strength DH36 ship steel with nickel alloy UNS N06022 filler. Results of a 92-day natural seawater test comprising exposure of directly welded and electrically coupled specimens in nominal 1:1 and 10:1 surface area ratio configurations are presented and discussed. Comparisons are made with other previously reported tests comprising other stainless steel and carbon steel couples.

Keywords: Seawater, galvanic corrosion, 6 Mo alloy UNS N08367, DH36 steel UNS K02300, nickel alloy UNS N06022 welds, area effects
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07244 Mitigation of Galvanic Corrosion in Seawater Piping Systems

Product Number: 51300-07244-SG
ISBN: 07244 2007 CP
Author: Brett M. Tossey and John A. Beavers
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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.
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