What is the chemical process taking place in sulphuric acid anodizing?
by joeyeehu...
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Chemistry
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Anodising is a process to form a uniform layer of aluminium oxide on aluminium. This is done by the electrolysis process using aluminium as the anode, platinum or other inert substance as cathode and sulphuric acid as the electrolyte.
At the cathode, hydrogen gas is produced. 2H+ + 2e ----> H2
At the anode, oxygen gas is produced. 4OH- ---> 2H2O + O2 + 4e
The oxygen gas produced at the anode (aluminium) will react with Al to form aluminium oxide.
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