Electrolysis corrosion of underwater metals on power boats can result in serious deterioration. The boat owner must be aware of the possibilities of galvanic action (the deterioration of underwater metals due to dissimilar characteristics when placed in saltwater) and/or electrolysis. It is the owner's responsibility to check for and replace parts damaged by galvanic deterioration.
Refer to your Sea Ray dealer to investigate the source of stray corrosive currents. Inboard/outboard and outboard engines are fitted with zinc anodes on their lower units (refer to the engine operator's manual for their locations). If your boat is equipped with trim planes (tabs), zinc plates are installed on the trim planes (tabs). Zinc protects underwater hardware. Zinc, being much less "noble" than copper-based alloys and aluminum used in Sea Ray underwater fittings, will deteriorate first and protect the more noble parts.
Zinc anodes generally require replacement about once a year; however, they should be checked weekly. In salt water areas, replace every six months. The need to replace anodes more frequently may indicate a stray current problem within the boat or at the slip or mooring. If zinc anodes do not need replacing after one year, they may not be providing proper protection. Loose anodes or low grade zinc may be the problem.
NOTICE: Do not paint between the zinc and the metal it contacts, and do not paint over the zinc.
Back to Maintenance Tips Selections