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In anodization of aluminium,the aluminium object to be oxidized is the anode,the electrolyte is dilute sulfuric acid the and the aluminium is the cathode
I was taught that the hydroxide ions will preferentially discharge,then the aluminium object will be oxidized by the oxygen formed(?),but i was also taught that according to the electrochemical series,Al should be oxidized first,when does it happen?
Also,if the object is already fully covered by an oxide layer,how can the oxide layer further increase?I mean the inner aluminium part doesn't have and contact with the solution or whatever,how can a reaction occur?
Thank you!
I was taught that the hydroxide ions will preferentially discharge,then the aluminium object will be oxidized by the oxygen formed(?),but i was also taught that according to the electrochemical series,Al should be oxidized first,when does it happen?
Also,if the object is already fully covered by an oxide layer,how can the oxide layer further increase?I mean the inner aluminium part doesn't have and contact with the solution or whatever,how can a reaction occur?
Thank you!