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Direction of Electron Flow During Corrosion

Direction of Electron Flow During Corrosion. Aim: To find out the how electrons flow during corrosion. To find out how to identify electron flow during corrosion. A. Magnesium. Iron nail. Pink colour due to the OH - ions. Salt solution with ferroxyl indicator. Iron and Magnesium Cell.

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Direction of Electron Flow During Corrosion

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  1. Direction of Electron Flow During Corrosion Aim: To find out the how electrons flow during corrosion. To find out how to identify electron flow during corrosion.

  2. A Magnesium Iron nail Pink colour due to the OH- ions Salt solution with ferroxyl indicator Iron and Magnesium Cell • Iron does not rust in this cell. The electrons flow to the iron. (Mg higher than Fe in the ECS) Mg  Mg2+ + 2e- 2H2O + O2 4e- OH-

  3. Iron and Copper Cell • As corrosion takes place, electrons flow away from the iron. (Cu is lower than Fe in the ECS). Copper

  4. Fe  Fe2+ + 2e- 2H2O + O2 + 4e- OH- • The electrons are produced as the iron oxidises. (oxidation) • The pink colour around the copper is due to the corresponding reduction reaction, which results in the formation of OH- ions.

  5. Iron and Carbon Cell • In an iron/carbon cell, the blue colour around the iron indicates that the iron is rusting (presence of Fe2+ ions).

  6. As corrosion takes place, electrons flow away from iron. • The electrons are produced as the iron oxidises. (oxidation) • The pink colour around the carbon is due to the correspondingreductionreaction, which results in the formation of OH- ions.

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