In: Chemistry
Steel plate is in contact with copper. give the schematic electrochemical corrosion in neutral and acidic meduims and write the equations for the reactions that occur.
Please write the equations for the reactions, not just the schematic
Ans - Fe (iron) at the suface dissolve in moisture film and leaves electron or neagatice charge in atom -
the reaction is given by-
Fe ----------> Fe2+ + 2 e-
Dipolarizer electron from metal and corrosion continues common dipolarizers are -
oxygen -
O2 + 4H2O ----------------> 4OH- + 4e-
acid reaction is given as -
2H+ +2e- -------------> H2
cationic equation is -
Cu2+ +2e- ---------------> Cu
The metal cones under stress , the metal ions dissolve in moisture , the resulting hydroxide ions react with the Fe2+ to form the mixture of hydrous iron oxides known as rust (a film ).