reaction taking place during anodizing of aluminium at cathode
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Anodising is a process for producing protective layer on articles made of
aluminium and its alloys. The article is made the anode with aqueous
sulphuric acid as electrolyte where the following reaction occurs:
2Al + 3H2O ----> Al2O3 + 6H+ ( positive ion ) + 6e (negative ion)
Hope it helps!!
2Al + 3H2O ----> Al2O3 + 6H+ ( positive ion ) + 6e (negative ion)
Hope it helps!!
Answered by
1
The overall reaction that takes place during anodization is:
2Al + 3H2O => Al2O3 + 3H2
This is the sum of the separate reactions at each electrode. The reactions at the anode occur at the metal/oxide and oxide/ electrolyte interfaces. The ions that make up the oxide are mobile under the high field conditions.
At the metal/oxide interface the inward moving oxygen anions react with the metal:
2Al + 3O2- => Al2O3 + 6e-
2Al + 3H2O => Al2O3 + 3H2
This is the sum of the separate reactions at each electrode. The reactions at the anode occur at the metal/oxide and oxide/ electrolyte interfaces. The ions that make up the oxide are mobile under the high field conditions.
At the metal/oxide interface the inward moving oxygen anions react with the metal:
2Al + 3O2- => Al2O3 + 6e-
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