As it was mentioned, specific sheets called galvanic sheets are used in the galvanic sandwich panel. Galvanic sheets are iron sheets covered with zinc. In galvanized iron, the electrochemical bond is formed between iron and zinc on which zinc is used instead of iron as a cathode and iron are used as a cathode. Zinc is oxidized on the anode because it is more active metal than iron and has lower reduction potential than iron and has higher oxidation potential. A reverse reaction is done in making can by it.