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Консультация № 200201
31.01.2021, 22:55
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
При никелировании изделий использовался ток плотностью 0,4 А/дм2. Какой толщины слой никеля (двухвалентного) можно получить, пропуская ток в течение 8,9 ч?
Если можно, то со схемой🙏
При никелировании изделий использовался ток плотностью 0,4 А/дм2. Какой толщины слой никеля (двухвалентного) можно получить, пропуская ток в течение 8,9 ч?
Если можно, то со схемой🙏
Обсуждение
03.02.2021, 15:03
общий
это ответ
Здравствуйте, Stasya!
За время t при плотности тока j через единицу площади пройдет заряд
Q = j*t.
По закону Фарадея, на единице площади будет осаждено количество вещества
m = (Q/F)*(M/z),
где F - постоянная Фарадея, F = 96500 Кл/моль , M - атомная масса иона, z - валентность ионов.
Для никеля M = 58.7 г/моль (из справочника). По условию задачи:
z = 2, t = 8,9ч = 8,9*3600 = 32040 с, j = 0.4 А/дм^2 = 0,004 А/см^2.
Находим
Q = 0.004*32040 = 128,16 Кл/см^2,
m = (128.16/96500)*(58.7/2) = 0.039 г/см^2.
Чтобы определить толщину слоя, достаточно разделить массу, приходящуюся на квадратный сантиметр,
на плотность никеля 8,9 г/см^3 (из справочника). Искомая толщина равна
d = 0,039/8,9 = 0,0044 см = 0,044 мм = 44 мкм.
За время t при плотности тока j через единицу площади пройдет заряд
Q = j*t.
По закону Фарадея, на единице площади будет осаждено количество вещества
m = (Q/F)*(M/z),
где F - постоянная Фарадея, F = 96500 Кл/моль , M - атомная масса иона, z - валентность ионов.
Для никеля M = 58.7 г/моль (из справочника). По условию задачи:
z = 2, t = 8,9ч = 8,9*3600 = 32040 с, j = 0.4 А/дм^2 = 0,004 А/см^2.
Находим
Q = 0.004*32040 = 128,16 Кл/см^2,
m = (128.16/96500)*(58.7/2) = 0.039 г/см^2.
Чтобы определить толщину слоя, достаточно разделить массу, приходящуюся на квадратный сантиметр,
на плотность никеля 8,9 г/см^3 (из справочника). Искомая толщина равна
d = 0,039/8,9 = 0,0044 см = 0,044 мм = 44 мкм.
Форма ответа
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