Posted by William (188.8.131.52) on December 11, 2002 at 22:27:59:
In Reply to: Aluminum posted by jeff on December 10, 2002 at 17:27:57:
: Could someone tell me the best choice of aluminum for a long fin used in saltwater (corrosive qualities). There is flexing of the fin so strength is important. thanks
The best corrosion resistant aluminum for saltwater service is the purer grades of aluminum. Those without copper,zinc etc.
Mr. Kimball is correct 6061 is a good choice , very machineable/weldable and when hard anodized it will last a long time. Anodizing however can add to cost. If this is a skagg or fin that will be exposed when say the craft is removed from the water then the plain aluminum surface can be cleaned and waxed on a regular basis. You mentioned long fin! If there is risk of running aground you should consider stainless steel materials and shapes.
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