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Internal corrosion of copper-nickel alloy tubes 90/10 and 70/30 in chlorinated seawater for shell and tube heat exchangers
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)
Wieland-Werke AG, Germany.
2019 (English)In: NACE - International Corrosion Conference SeriesVolume 2019-March, 2019, Article number 13338Corrosion Conference and Expo 2019; Nashville; United States; 24 March 2019 through 28 March 2019;ACE - Int. Corros. Conf. Ser., National Assoc. of Corrosion Engineers International , 2019Conference paper, Published paper (Refereed)
Abstract [en]

The corrosion resistance of copper-nickel 90/10 and 70/30 tubes for heat exchangers was evaluated in 0.5 ppm-chlorinated seawater, under controlled service conditions in a bespoke test loop. The results were compared to Al-Brass tubes tested under the same conditions. Copper-Nickel 90/10 tubes were tested with two different geometries: internal smooth surface and internal finned surface (helix geometry). Internal pitting corrosion resistance was evaluated under simulated heat transfer conditions at two controlled skin temperatures from the internal and the external parts of the tubes for 6 months, at 50°C (Tskin-in)/35°C (Tseawater) and 70°C (Tskin-in)/35°C (Tseawater). For all the tested copper alloys, the uniform corrosion was very low and negligible. For both temperatures, CuNi 90/10 was globally more resistant to localized corrosion than CuNi70/30. The most corrosion resistant configuration was the CuNi 90/10 with the internal finned geometry. The best corrosion resistance compared to the smooth geometry might be attributed to different hydrodynamic conditions at the seawater/metal interface.

Place, publisher, year, edition, pages
National Assoc. of Corrosion Engineers International , 2019.
Keywords [en]
Chlorinated seawater, Copper-nickel alloys, Internal corrosion, Tube heat exchangers, Binary alloys, Copper alloys, Corrosion resistance, Geometry, Heat exchangers, Heat resistance, Heat transfer, Nickel alloys, Pitting, Seawater corrosion, Tubes (components), Controlled services, Copper nickel alloys, Corrosion-resistant, Different geometry, Heat transfer conditions, Hydrodynamic conditions, Shell and tube heat exchangers, Copper corrosion
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-39993Scopus ID: 2-s2.0-85070078855OAI: oai:DiVA.org:ri-39993DiVA, id: diva2:1361652
Conference
NACE - International Corrosion Conference Series Volume 2019-March, 2019, Article number 13338 Corrosion Conference and Expo 2019; Nashville; United States; 24 March 2019 through 28 March 2019;
Available from: 2019-10-16 Created: 2019-10-16 Last updated: 2019-10-16Bibliographically approved

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