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Article: The current scoop on galvanic corrosion.(sea worthy)
- Article from:
- BOAT/U.S. Magazine
- Article date:
- January 1, 2006
- Author:
CopyrightCOPYRIGHT 2006 Boat Owners Association. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Pitting on the outdrive's lower unit was first noticed by the boat's owner in the spring of 2002. The following year, "some degree of corrosion was evident" on the same outdrive, so the owner slapped on a fresh coat of paint and hoped for the best. He was making a big mistake.
By the next spring, the price of ignoring an obvious warning sign became painfully evident: the outdrive was so badly corroded it would no longer go into gear.
The reason was simple: the lack of an anode, which should have been sacrificed to protect the aluminum outdrive from galvanic corrosion. The last anode, it seems, had been placed on the outdrive in 2001, which is an ...