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

A45 - natural seawater + NH3 pollution (1700 ppm)at ambient temperature1,00E-02- A45 one month in circulating natural seawater(reference)1,00E-03current density (A/cm²)1,00E-041,00E-051,00E-06- A45 one month in circulating natural seawater then seawatertreated with NH3 (1700 ppm)45945545231,00E-07-A45 one month and 3 weeks in circulating seawaterthen tseawater teated with NH3 (1700ppm)1,00E-08-400 -300 -200 -100 0 100 200 300 400Scanning rate 0.05 mV/sE (mV/SCE)Figure 9: A45 Anodic polarization curves after exposure to natural sea water and pollutedsea water with ammonia1,00E-02CuAl9Ni3Fe2 - Natural seawater + NH3 pollution (1700 ppm) at 20°C1,00E-03Natural seawater1,00E-04current density (A/cm²)1,00E-051,00E-06C23C6C251,00E-07C23 in natural seawater one month before NH3 treatment ( 1700 ppm)1,00E-08C25 in natural seawater one month and a half beforeNH3 treatment ( 1700 ppm )1,00E-09-400 -300 -200 -100 0 100 200 300 400scanning rate 0.05 mV/sE (m V/SCE)Figure 10: CuAl9Ni3Fe2Anodic polarization curves after exposure to natural sea water and polluted sea waterwith ammonia14