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Old 01-04-2019, 07:08 AM   #11
bglad
Senior Member
 
City: Green Cove Springs, Florida
Join Date: Feb 2012
Posts: 344
Sorry responding so late. You will be overshooting trying for -1100mv. Realistically you need no more than -700mv or so depending on the quality of the materials. I suspect your propellers (probably Nibral) are what you are aiming to protect from the stainless-steel under your boat and they range between -310 to -420. ABYC indicates protecting above -1100mv may be detrimental to antifouling paint coatings.

2.5.1 A cathodic protection system shall be capable of inducing and maintaining a minimum negative shift of 200 mV relative to the corrosion potential of the least noble metal being protected.


Quote:
Originally Posted by Wood View Post
^^
Now to figure how much protection the boat will need to get to -1100mv. I fear some trial and error next spring.

Re - surveyor - when I got the report he had the engines identified as raw water cooled. Useless.
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