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Corrosion is the nemesis of all mariners, one of natures phenomena is the fact that two different connected metals immersed in electrolyte (in our case sea water or polluted fresh water) develop electrical voltage and current, the result of which is the loss of the most active metal – your propeller, rudder, “P” or “A” brackets or other under water items.
It seems that everything touching seawater quickly weakens due to the unstoppable effects of corrosion. “Corrosion ranks with fatigue as the most common cause of material failure” however they often work together, what corrosion starts fatigue will finish.
With anodes undertaking such a vital role can you be certain that your anode is protecting your very expensive pair of propellers?
The answer is yes, there are several ways. One is to constantly lift your boat to check the anodes are being eroded at the correct rate.
However, this still leaves you with the uncertainty as to whether the anode is over protecting, under protecting or is just right for your cathodes (propellers, shafts, rudder etc).
Both of these options are costly and time consuming and still do not give you the full picture on the status of your anodes.
REA ASSOCIATES Ltd can carry out a full Galvanic Survey. This would detail a report assessing the following information: