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96517 LONG-TERM CURRENT AND POTENTIAL DATA FOR SELECTED GALVANIC COUPLES IN FLOWING SEAWATER

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Product Number: 51300-96517-SG
ISBN: 96517 1996 CP
Author: Richard Foster, Keith Lucas, Harvey Hack, Bradley Bieberich, Timothy Jackovic
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Duplicate galvanic couples with aII area ratio were constructed from all combinations of the following materials: type 304L stainless steel, 90/10 copper-nickel, 70/30 copper-nickel, nickel-aluminum bronze, silicon bronze, and copper. In addition, duplicate panels of each of these materials were catholically protected with either anode grade zinc or iron. Exposures were conducted in natural seawater flowing at 5-ft/s for 375 days while monitoring galvanic current and couple potential. Major changes in galvanic currents tended to occur within the first 120-days exposure, although drift to lower currents was observed over the entire test period. Couple potentials were highly variable over the entire exposure period. but major potential drift tended to occur within the first 120 days. The highest current densities for couples not including zinc or iron were for all of the 304L couples, particularly those with silicon bronze and copper, nickel-aluminum bronze coupled to silicon bronze or copper, and 70/30 copper-nickel coupled to silicon bronze or copper. Current densities for all other couples were below I mA/ft2 and should result in low total currents for reasonable anode/cathode area ratios. Keywords: galvanic corrosion, cathodic protection, current density, polarization, seawater, stainless steel, coppernickel, nickel-aluminum bronze, silicon bronze. copper, iron, zinc
Duplicate galvanic couples with aII area ratio were constructed from all combinations of the following materials: type 304L stainless steel, 90/10 copper-nickel, 70/30 copper-nickel, nickel-aluminum bronze, silicon bronze, and copper. In addition, duplicate panels of each of these materials were catholically protected with either anode grade zinc or iron. Exposures were conducted in natural seawater flowing at 5-ft/s for 375 days while monitoring galvanic current and couple potential. Major changes in galvanic currents tended to occur within the first 120-days exposure, although drift to lower currents was observed over the entire test period. Couple potentials were highly variable over the entire exposure period. but major potential drift tended to occur within the first 120 days. The highest current densities for couples not including zinc or iron were for all of the 304L couples, particularly those with silicon bronze and copper, nickel-aluminum bronze coupled to silicon bronze or copper, and 70/30 copper-nickel coupled to silicon bronze or copper. Current densities for all other couples were below I mA/ft2 and should result in low total currents for reasonable anode/cathode area ratios. Keywords: galvanic corrosion, cathodic protection, current density, polarization, seawater, stainless steel, coppernickel, nickel-aluminum bronze, silicon bronze. copper, iron, zinc
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In this work, the open circuit potential of different stainless steel grades as well as nickel based and copper based alloys has been systematically measured in seawater under different experimental conditions. In particular the effect of temperature, oxygen content and chlorination level have been studied.
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