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Консультация № 109991
18.11.2007, 14:40
0.00 руб.
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Зравствуйте! Вот такая задача:
Приведите схемы электрохимической коррозии луженого железа в различных средах
Буду благодарен за решение.
Приведите схемы электрохимической коррозии луженого железа в различных средах
Буду благодарен за решение.
Обсуждение
Неизвестный
18.11.2007, 16:32
общий
это ответ
Здравствуйте, piit!
Легко. Так как железо стоит левее олова в ряду напряжений, "роли" между ними распределяются так:
Fe - анод
Sn - катод
В кислой среде:
Fe - 2e = Fe<sup>2+</sup>
O<sub>2</sub> + 4H<sup>+</sup> + 4e = 2H<sub>2</sub>O
В нейтральной (и щелочной) среде:
Fe - 2e = Fe<sup>2+</sup>
O<sub>2</sub> + 2H<sub>2</sub>O + 4e = 4OH<sup>-</sup>
Легко. Так как железо стоит левее олова в ряду напряжений, "роли" между ними распределяются так:
Fe - анод
Sn - катод
В кислой среде:
Fe - 2e = Fe<sup>2+</sup>
O<sub>2</sub> + 4H<sup>+</sup> + 4e = 2H<sub>2</sub>O
В нейтральной (и щелочной) среде:
Fe - 2e = Fe<sup>2+</sup>
O<sub>2</sub> + 2H<sub>2</sub>O + 4e = 4OH<sup>-</sup>
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