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We have stated that it is not possible to benefit from a performing and healthy hull without treating the protection of the boat against corrosion on one hand and the good condition of the appendages on the other hand. The approaches on the phenomenon of galvanising or electrical corrosion are complex. If you wish to know more, we invite you to download the complete folder by our partner :
http://www.galvatest.com/PLB_Protection_Cathodique
Oceoprotec© and corrosion
We are very watchful concerning the problems of galvanic and electrolytic corrosion as they can damage the appendages of the boat, or even alter the Oceoprotec© coating. Our approach to corrosion is founded on the two following assumptions :
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We neutralize corrosion between the Oceoprotec© coating and other metals present on the hull by preventing physical contact between the Oceoprotec© film and the other metals with two methods :
*We leave a free band or disc of 3centimetres not treated with Oceoprotec surrounding the metal pieces.
*An isolating epoxy is applied to the metal pieces.
This non-treated area of several centimetres between the metal pieces benefits from a copper ion field of Oceoprote© coating and stays clean.
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The possible power surges (a current 12/ 24 V or an alternative circuit 110/220 V) are independant of the Oceoprotec© coating presence. On the other hand, they amplify the occurrence of corrosion, they can alter the Oceoprotec© coating and weaken the general protection of the hull against grime. In this case, we carry out a systematic electrical control in order to provide you with the best possible protection of your boat.
Our advice :
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Carry out or have carried out an electric check-up every 2 years.
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Install a galvanic isolator. It prevents from a low tension continuous current, circulating so that everyone on board or on the dockside can be protected against power surges.
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Check for erosion of the anodes. If it is too rapid, it is an indication for the presence of current corrosion.
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Regularly inspect your keel for rust. Check the ends each year. Pay attention to the junction between the keel and the hull which is often a weak point in the hull.
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Examine the rubber joint at the base of the sail drive to evaluate its age and to see if it is still waterproof. It is one of the most common inflitration points.
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Give priority to the polymer sea cock, like on an aluminium hull. It contributes to good insulation of the boat.
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For the sail drive like the Z-Drive one, check each year the good condition of the peripheral pieces : the different types of rubber joints, the turbine...
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The presence of shipworms or other seashells can be an indicator for a poor cathodic protection of the hull.
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Limit the variety of metals and aloy present on the hull.
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