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Консультация № 178121
30.04.2010, 14:34
35.95 руб.
0
1
1
Доброго времени суток, уважаемые эксперты!
Прошу вашей помощи в решении следующей задачи.
Задача.
Определите тип коррозии. Составьте уравнения процессов, протекающих в каждом из случаев, и схему коррозионного элемента для случая электрохимической коррозии.
а) полированная алюминиевая пластина в насыщенном кислородном керосине при T=298 K;
б) стальное изделие, паянное оловом эксплуатируется в среде соляной кислоты.
Заранее спасибо.
Прошу вашей помощи в решении следующей задачи.
Задача.
Определите тип коррозии. Составьте уравнения процессов, протекающих в каждом из случаев, и схему коррозионного элемента для случая электрохимической коррозии.
а) полированная алюминиевая пластина в насыщенном кислородном керосине при T=298 K;
б) стальное изделие, паянное оловом эксплуатируется в среде соляной кислоты.
Заранее спасибо.
Обсуждение
Неизвестный
01.05.2010, 05:05
общий
это ответ
Здравствуйте, Botsman.
А) Разновидность химической коррозии – газовая коррозия
4Al + 3O2 = 2Al2O3
Б) Электрохимическая коррозия железа (считая сталь железом), содержащего в качестве примеси олово.
Е0 (Fe2+/Fe) = -0,44 B;
Е0 (Sn2+/Sn) = -0,133 B.
Таким образом, получаем гальванический элемент, где железо - анод, олово - катод
В кислой среде (А)Fe /HCl /Sn (K)
(A) процесс окисления - Fe - 2ē = Fe2+
(K) процесс восстановления - 2H+ + 2ē = H2
Суммарно Fe + 2H+ = Fe2+ + H2
В молекулярной форме Fe + 2HCl = FeCl2 + H2
А) Разновидность химической коррозии – газовая коррозия
4Al + 3O2 = 2Al2O3
Б) Электрохимическая коррозия железа (считая сталь железом), содержащего в качестве примеси олово.
Е0 (Fe2+/Fe) = -0,44 B;
Е0 (Sn2+/Sn) = -0,133 B.
Таким образом, получаем гальванический элемент, где железо - анод, олово - катод
В кислой среде (А)Fe /HCl /Sn (K)
(A) процесс окисления - Fe - 2ē = Fe2+
(K) процесс восстановления - 2H+ + 2ē = H2
Суммарно Fe + 2H+ = Fe2+ + H2
В молекулярной форме Fe + 2HCl = FeCl2 + H2
5
Спасибо!
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