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Консультация № 153200
06.12.2008, 14:16
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1) Какой из металлов будет подвергаться коррозии в случае нарушения целостности слоя хромированного железа в атмосфере промышленного района? (влажный воздух содержит: CO2, H2S, SO2 и др.)
2) Определите природу металлического покрытия в случае никелированного железа. Что произойдет при нарушении целостности покрытия в кислой среде?
2) Определите природу металлического покрытия в случае никелированного железа. Что произойдет при нарушении целостности покрытия в кислой среде?
Обсуждение
07.12.2008, 00:12
общий
это ответ
Здравствуйте, Domenick!
Восстановительный потенциал железа [$966$](Fe2+|Fe)=-0,447 В, потенциал хрома значительно меньше (-0,744 для Cr3+|Cr)
Таким образом, станет анодом (и будет окисляться) хром, защищая железо от коррозии.
Восстановительный потенциал никеля [$966$](Ni2+|Ni)=-0,257 В, то есть больше, чем у железа.
Таким образом, никель является катодным покрытием. При нарушении целостности покрытия окисляться будет железо (являющееся анодом).
Восстановительный потенциал железа [$966$](Fe2+|Fe)=-0,447 В, потенциал хрома значительно меньше (-0,744 для Cr3+|Cr)
Таким образом, станет анодом (и будет окисляться) хром, защищая железо от коррозии.
Восстановительный потенциал никеля [$966$](Ni2+|Ni)=-0,257 В, то есть больше, чем у железа.
Таким образом, никель является катодным покрытием. При нарушении целостности покрытия окисляться будет железо (являющееся анодом).
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