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Консультация № 190693
14.03.2017, 07:58
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Здравствуйте! Прошу помощи в следующем вопросе:
Какое покрытие: магниевое или кадмиевое надежней защитит железное изделие от коррозии? Почему? Напишите уравнения коррозии в кислой среде для обоих случаев. Будут ли оксидные пленки, образующиеся на хроме, обладать защитными свойствами?
Какое покрытие: магниевое или кадмиевое надежней защитит железное изделие от коррозии? Почему? Напишите уравнения коррозии в кислой среде для обоих случаев. Будут ли оксидные пленки, образующиеся на хроме, обладать защитными свойствами?
Обсуждение
15.03.2017, 09:24
общий
это ответ
Здравствуйте, nikita9581!
Рассмотрим первое задание.
Какое покрытие: магниевое или кадмиевое надежней защитит железное изделие от коррозии? Почему? Напишите уравнения коррозии в кислой среде для обоих случаев.
Выпишем стандартные электродные потенциалы для следующих электродных процессов: E0(Cd2+/Cd)=-0,403 В, E0(Fe2+/Fe)=-0,440 В, E0(Mg2+/Mg)=-2,363 В.
Если целостность покрытия будет нарушена, то коррозии будет подвергаться металл с более низким потенциалом. Поэтому при нарушении кадмиевого покрытия на железе подвергаться коррозии будет железо, а при нарушении магниевого покрытия на железе подвергаться коррозии будет магний. Значит, магниевое покрытие надёжнее, чем кадмиевое, защищает железо от коррозии.
Коррозия в паре железо - кадмий в кислой среде происходит следующим образом:
Анодный процесс: окисление железа Fe–2e[$8596$]Fe2+ (окисление железа).
Катодный процесс: 2Н++2e[$8594$]Н2[$8593$] (восстановление водорода).
Коррозия в паре железо - магний в кислой среде происходит следующим образом:
Анодный процесс: Mg–2e[$8594$]Mg2+ (окисление магния).
Катодный процесс: 2Н++2e[$8594$]Н2[$8593$] (восстановление водорода).
Рассмотрим первое задание.
Какое покрытие: магниевое или кадмиевое надежней защитит железное изделие от коррозии? Почему? Напишите уравнения коррозии в кислой среде для обоих случаев.
Выпишем стандартные электродные потенциалы для следующих электродных процессов: E0(Cd2+/Cd)=-0,403 В, E0(Fe2+/Fe)=-0,440 В, E0(Mg2+/Mg)=-2,363 В.
Если целостность покрытия будет нарушена, то коррозии будет подвергаться металл с более низким потенциалом. Поэтому при нарушении кадмиевого покрытия на железе подвергаться коррозии будет железо, а при нарушении магниевого покрытия на железе подвергаться коррозии будет магний. Значит, магниевое покрытие надёжнее, чем кадмиевое, защищает железо от коррозии.
Коррозия в паре железо - кадмий в кислой среде происходит следующим образом:
Анодный процесс: окисление железа Fe–2e[$8596$]Fe2+ (окисление железа).
Катодный процесс: 2Н++2e[$8594$]Н2[$8593$] (восстановление водорода).
Коррозия в паре железо - магний в кислой среде происходит следующим образом:
Анодный процесс: Mg–2e[$8594$]Mg2+ (окисление магния).
Катодный процесс: 2Н++2e[$8594$]Н2[$8593$] (восстановление водорода).
Об авторе:
Facta loquuntur.
Facta loquuntur.
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