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Консультация № 189299
04.05.2016, 09:37
0.00 руб.
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Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
В обычных условиях во влажном воздухе оцинкованное железо при нарушении покрытия не ржавеет, тогда как при температуре выше 70 градусов по Цельсию оно покрывается ржавчиной. Чем это можно объяснить? Составить электронные уравнения анодного и катодного процессов коррозии оцинкованного железа в первом и втором случаях.
Спасибо
В обычных условиях во влажном воздухе оцинкованное железо при нарушении покрытия не ржавеет, тогда как при температуре выше 70 градусов по Цельсию оно покрывается ржавчиной. Чем это можно объяснить? Составить электронные уравнения анодного и катодного процессов коррозии оцинкованного железа в первом и втором случаях.
Спасибо
Обсуждение
08.05.2016, 10:42
общий
это ответ
Здравствуйте, Katerina!
При низкой температуре цинк окисляется прежде железа. При этом в итоге образуется налёт гидроксида цинка, который не препятствует дальнейшему окислению
Анодный процесс - окисление цинка:
Zn-2e-=Zn2+
Катодный процесс - восстановление кислорода (легче протекает на поверхности железа, но в принципе протекает по всей металлической поверхности):
O2+2H2O+4e-=4OH-
Суммарная реакция:
2Zn+O2+2H2O=2Zn(OH)2
При повышенной температуре цинк пассивируется, образуя плотную оксидную плёнку, препятствующую дальнейшему окислению на поверхности цинка:
2Zn+O2=2ZnO
В этом случае в качестве анодного процесса начинает протекать окисление железа:
Fe+2H2O-3e-=FeO(OH)+3H+
Катодный процесс остаётся прежним.
Суммарная реакция:
4Fe+3O2+2H2O=4FeO(OH)
При низкой температуре цинк окисляется прежде железа. При этом в итоге образуется налёт гидроксида цинка, который не препятствует дальнейшему окислению
Анодный процесс - окисление цинка:
Zn-2e-=Zn2+
Катодный процесс - восстановление кислорода (легче протекает на поверхности железа, но в принципе протекает по всей металлической поверхности):
O2+2H2O+4e-=4OH-
Суммарная реакция:
2Zn+O2+2H2O=2Zn(OH)2
При повышенной температуре цинк пассивируется, образуя плотную оксидную плёнку, препятствующую дальнейшему окислению на поверхности цинка:
2Zn+O2=2ZnO
В этом случае в качестве анодного процесса начинает протекать окисление железа:
Fe+2H2O-3e-=FeO(OH)+3H+
Катодный процесс остаётся прежним.
Суммарная реакция:
4Fe+3O2+2H2O=4FeO(OH)
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