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Jet Boats
General Jet Boat Discussions
cathodic protection.
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<blockquote data-quote="smackdaddy53" data-source="post: 385547" data-attributes="member: 10154"><p>Pure zinc is what you need, a hull can be under or over protected which are both bad. If it is not corroding away it is under protected and the hull is still the anode, if it is corroding away AND bubbling paint around the hull contact point it is over protected/drawing too much stray current through it. Large ships use electronics hooked up to their anodes to regulate voltage/protection depending on conditions so optimal protection is always in effect. An aluminum anode is useless on an aluminum hull because it is on the same level on the noble metals chart. You want something lower on the chart but not the least noble or you would be replacing anodes all the time. A good hull anode should wear away in about a year.</p></blockquote><p></p>
[QUOTE="smackdaddy53, post: 385547, member: 10154"] Pure zinc is what you need, a hull can be under or over protected which are both bad. If it is not corroding away it is under protected and the hull is still the anode, if it is corroding away AND bubbling paint around the hull contact point it is over protected/drawing too much stray current through it. Large ships use electronics hooked up to their anodes to regulate voltage/protection depending on conditions so optimal protection is always in effect. An aluminum anode is useless on an aluminum hull because it is on the same level on the noble metals chart. You want something lower on the chart but not the least noble or you would be replacing anodes all the time. A good hull anode should wear away in about a year. [/QUOTE]
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Jet Boats
General Jet Boat Discussions
cathodic protection.
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