Why don iron boats need adenodes where steel ones do?
Surely you must mean steel boats and boats not made of steel. Steel is an alloy consisting mostly of iron, with a carbon content between 0.2 and 2.04% by weight (C:1000–10,8.67Fe), depending on grade. Carbon is the most cost-effective alloying material for iron, but various other alloying elements are used such as manganese, chromium, vanadium, and tungsten. Iron is an element and in its pure form is not used in building boats or ships. Boats built of steel require sacrificial anodes as an electric potential is generally set up between the hull (steel) and the propeller (generally brass) with seawater acting as an electrolyte. Without sacrificial anodes, electrolysis would slowly eat away the steel hull. Cathodic protection (fitting of sacrificial anodes) can be obtained by connecting a noble metal to a less noble. In practice steel is protected by supply of electrons from less noble metals like Zinc, Aluminium and Magnesium alloys often called sacrificial anode materials. Boats built
