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Internal Corrosion of Copper-Nickel Alloys Tubes 90/10 and 70/30 in Chlorinated Seawater for Heat Exchangers

The corrosion resistance of copper-nickel 90/70 and 70/30 tubes for heat exchangers was evaluated in 0.5 ppm-chlorinated seawater under controlled service conditions in bespoke test loop. 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 two controlled heat fluxes from the internal and the external parts of the tubes for 6 months at 65°C(Tskin-out)/50°C(Tskinin)/35°C(Tseawater) and 105°C(Tskin-out)/70°C(Tskin-in)/35°C(Tseawater). For all the tested copper alloys the uniform corrosion was extremely low and negligible. For both heat fluxes 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 finned internal geometry. The best corrosion resistance compared to the smooth geometry might be attributed to different hydrodynamic conditions at the seawater/metal interface.
Product Number: 51319-13338-SG
Author: Dominique Thierry
Publication Date: 2019
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