For boat owners, it is crucial to protect the metal parts of their boat that are immersed in seawater. These include aluminum https://hjyhardware.com/what-is-anodizing-what-are-the-advantages-of-anodizing/ propeller shafts, outboard motors, metal struts, stern drives, rudders, and rudders fittings. When the water current flows between 2 metals that are electrically or physically connected, this causes a galvanic reaction. To prevent this process from damaging the metals, a sacrificial anode for boats is needed.