Corrosion behaviour of copper alloys in natural sea water and ...

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1,0E+00- 50 mV/ECS-40-601,0E-01- 70 mV/ECS-80current in Amps1,0E-021,0E-03NibronNibron-100-120-140Potential/SCE in mV-1601,0E-04CuNi 90/10-1801,0E-050 100 200 300 400 500 600 700 800 900Test duration(hours)CuNi 90/10Figure 13Crevice corrosion initiation in natural sea water (ambient temperature)Comparison between Nibron and CuNi10Fe1Mn-2001,00E-03- 100 mV/ECS-1001,00E-04CuAl9Ni3Fe2-150Current in Amps1,00E-051,00E-061,00E-07A45-200-250-300Potential in mV/SCE1,00E-08CuAl9Ni3Fe2A45-3501,00E-09-4000 100 200 300 400 500Test duration in hoursFigure 14Crevice corrosion initiation in natural sea water (ambient temperature)Comparison between A45 and CuAl9Ni3Fe216
test duration (h)1h~47 ~71h144 167,5h315h 339h411h1,00E-02hh00 50 100 150 200 250 300 350 400 450 500- Torque wrench : 2 N/mm²-20- polish to a 600 grit finish1,00E-03-70 mV- 60 mV-50 mV-40-60-90 mV-80 mV-80I (A)1,00E-04-100 mV-100-120 mV-1201,00E-05E initial : -150 mV 10 µm - 10 hz- 1h10 µm - 10 hz- 1h-140-160-180E (mV/SCE)1,00E-06-200Figure 15 : Nibron - Crevice corrosion test under fretting in natural sea water 25°CAfter immersion in SW 3 WeeksAfter tests on fretting test bench:Corrosion initiationSlight corrosion at the circumference on0.5 mm(max depth. 30 µm)Taille image:Lateral specimenrep. 625-Ni-CF1-1corrosionTaille image:Corrosion initition:(max depth 70 µm)No corrosionSuperficial corrosion at thecircumferenceOn 0.5 mm(max depth . 20µm)Central specimenrep. 625-Ni-CF2-1 / face n°1Figure 16 : Nibron – Specimen examination after crevice corrosion test under fretting innatural sea water (25°C)17
Page 1 and 2: Corrosion behaviour of copper alloy
Page 3 and 4: Corrosion testingEoc and Rp measure
Page 5 and 6: A/cm 2 between -220 mV vs. SCE and
Page 7 and 8: U-bend tests conducted on Nibron co
Page 9 and 10: Material Al Zn Ni Fe Mn Impur Si Sn
Page 11 and 12: 0-50CuNi Na2S pollutionafter 1 mont
Page 13 and 14: 0-50-100CuAlE/ECS in mV-150-200-250
Page 15: OC potential (mV vs SCE)0-50-100-15
Page 19 and 20: 337,5hTest duration (h)~46h166h 214
Page 21 and 22: Cu Al9 Ni3 Fe2Sea Water + 170 ppm N

Corrosion behaviour of copper alloys in natural sea water and ...

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