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Консультация № 188482
20.12.2015, 14:50
0.00 руб.
0
1
1
Здравствуйте! У меня возникли сложности с таким вопросом:
С целью защиты от коррозии железное изделие покрыли оловом. Какое это покрытие анодное или катодное? Напишите уравнение анодного и катодного процессов коррозии в кислой среде при нарушении целостности покрытия. Будет ли оксидная пленка, образующаяся на магнии, обладать защитными свойствами.
С целью защиты от коррозии железное изделие покрыли оловом. Какое это покрытие анодное или катодное? Напишите уравнение анодного и катодного процессов коррозии в кислой среде при нарушении целостности покрытия. Будет ли оксидная пленка, образующаяся на магнии, обладать защитными свойствами.
Обсуждение
20.12.2015, 21:27
общий
это ответ
Здравствуйте, d28597!
Олово - менее активный металл, чем железо, поэтому покрытие катодное. При нарушении покрытия в кислой среде:
анод - железо: Fe-2e-=Fe2+
катод - олово: 2H++2e-=H2
Оксидная плёнка магния действительно достаточно плотная, чтобы препятствовать диффузии, и практически не реагирует с водой при комнатной температуре, поэтому защищает металл от коррозии. Лишённый оксидной плёнки магний активно реагирует с водой.
Олово - менее активный металл, чем железо, поэтому покрытие катодное. При нарушении покрытия в кислой среде:
анод - железо: Fe-2e-=Fe2+
катод - олово: 2H++2e-=H2
Оксидная плёнка магния действительно достаточно плотная, чтобы препятствовать диффузии, и практически не реагирует с водой при комнатной температуре, поэтому защищает металл от коррозии. Лишённый оксидной плёнки магний активно реагирует с водой.
5
Спасибо!
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