The believe is that the galvanize coating will provide corrosion protection, but my experience with hot dipped galvanize in the phototrophic zone is that it quickly corrodes away. It is somewhat slower in the lower, colder depths. My concern is it worth the additional cost? Disassembly is...
We do not use cathodic protection. The shackles are oversized to compensate for corrosion over time. We normally see a 4 to 5 year deployment life with no problems.
I have an application where steel shackles are used in a deep ocean mooring. We have used plain and painted steel shackles with good results. Now the push is to use hot dipped galvanized shackles. Is this necessary or will the hot dip quickly corrode away after several months?
