Galvanic corrosion (electrolysis) is the decomposition of metal due to the effects of electrolytic action. When two (2) dissimilar metals are immersed in a conductive fluid (e.g., salt water), an electric current is produced, much like the action of a battery. As the current flows, it takes with it tiny bits of the softer metal. If left unchecked, severe damage may occur over time. If the boat is operated in salt, polluted or brackish waters, even temporarily, the boat should be equipped with a transom-mounted zinc anode to prevent damage to those metal parts coming in contact with salt water.
The zinc is, by design, self-sacrificing. It is slowly eroded away by electrolytic action and requires periodic inspection for deterioration.
When the zinc has eroded to approximately one-half (1/2) of its original size, it must be replaced to continue protection, or damage to other metal parts may result.
2017 MasterCraft boats equipped with a saltwater package come equipped with a zinc anode. For fresh water boats that may be operated in polluted or brackish water on occasion, an authorized MasterCraft dealer can provide guidance in securing and installing a zinc anode for protection.