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Galvanic corrosion induced by the use of high alloy stainless steel in seawater applications
RISE - Research Institutes of Sweden, Materials and Production, KIMAB. (Institut de la Corrosion)
DGA Naval Systems, France.
RISE - Research Institutes of Sweden, Materials and Production, KIMAB. (Institut de la Corrosion)
RISE - Research Institutes of Sweden, Materials and Production, KIMAB. (Institut de la Corrosion)
2012 (English)In: NACE - International Corrosion Conference Series, 2012, p. 235-253Conference paper, Published paper (Refereed)
Abstract [en]

The galvanic corrosion of carbon steel (UNS G10150) and of copper-nickel 90/10 (UNS C70600) coupled to superduplex stainless steel (UNS S32750) in seawater was investigated from 6°C to 70°C, with different cathode to anode ratios. The effect of chlorination on galvanic corrosion rates was also studied. Continuous monitoring of the open-circuit potentials and galvanic currents were performed to measure the exact evolution and the contribution of the galvanic corrosion on the total corrosion. Results showed that formation of natural biofilms and precipitation of calcareous deposits on surfaces had a very significant impact on the cathodic efficiency, which is directly correlated to the rate of galvanic corrosion. For all the tested configurations, chlorination led to a significant decrease of the measured galvanic currents due to the low cathodic efficiency of surfaces in chlorinated media (i. e. no biofilm). The long term exposure of specimens allowed to draw realistic pseudo-polarization curves which were used in a boundary element modeling software.

Place, publisher, year, edition, pages
2012. p. 235-253
Keywords [en]
Biofilm, Chlorination, Copper alloy, Galvanic corrosion, Modelling, Pseudo-polarization curves, Seawater, Stainless steel, Boundary elements, Calcareous deposit, Continuous monitoring, Galvanic current, High-alloy stainless steel, Long term exposure, Modeling softwares, Open-circuit potential, Significant impacts, Superduplex stainless steels, Biofilms, Carbon steel, Copper alloys, Models, Polarization, Corrosion rate
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:ri:diva-40412Scopus ID: 2-s2.0-84865415415ISBN: 9781622760787 (print)OAI: oai:DiVA.org:ri-40412DiVA, id: diva2:1361443
Conference
11 March 2012 through 15 March 2012, Salt Lake City, UT
Available from: 2019-10-16 Created: 2019-10-16 Last updated: 2019-10-16Bibliographically approved

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