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Propeller Shaft Corrosion

Galvanic corrosion occurs when dissimilar metals, such as a steel propeller shaft and a bronze propeller, are immersed in an electrolytic solutions such as seawater. Dissimilar metals have a corrosion potential measured as a voltage that results in electrical current passing from the more noble metal to the less noble metal. This transfer of current results in the deterioration of the less noble metal. Zinc is one of the least noble metals in existence; and by properly attaching it to your hull, propeller shafts, rudders, trim tabs and engines, corrosion is confined to the zinc itself. Periodically inspect your sacrificial zincs and replace them when they have been reduced to half of their original size.

 

Pitted Propeller Shaft

 

Pitted stainless steel shaft from lack of anode protection.

Photo courtesy of Capt. David Rifkin (USN Retired) ©2013
Quality Marine Services

All rights reserved. Used with permission.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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