Aluminium Anode for Johnson-Evinrude 4-7.5HP RO:432397, 334451
Aluminium Anode for Johnson-Evinrude
Lower unit anode for J/E 4-7.5HP
Reference to: 432397, 334451
The anode is made from a metal alloy with a more ""active"" voltage (more negative electrochemical potential) than the metal of the structure it is protecting (the cathode). The difference in potential between the two metals means the sacrificial anode material corrodes in preference to the structure.