dapper
Part of things
Posts: 293
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Mar 30, 2012 22:46:04 GMT
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buzby
Part of things
Posts: 158
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Mar 30, 2012 23:13:14 GMT
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dapper
Part of things
Posts: 293
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Looks like I just got told
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Oil rigs use an electrical based system that has a sacrificial bock not sure how it works though,
"goes off to ask google"
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buzby
Part of things
Posts: 158
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Mar 31, 2012 11:12:12 GMT
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Oil rigs use an electrical based system that has a sacrificial bock not sure how it works though, "goes off to ask google" Smaller structures (like small ships) can get away with just using a sacrificial anode, as the galvanic current induced between the metal of the anode and the steel structure is enough to make all of the steel structure negative potential compared to the anode. For larger structures (like oil rigs and pipeleines) they use Impressed Current Cathodic Protection ( en.wikipedia.org/wiki/Cathodic_protection#Impressed_current_CP ), which adds an extra DC current source to the steel in addition to the current provided by the galvanic reaction of the steel with the sacrificial anode. The Corrosion Doctors link describes why this system does not really work for cars. Firstly, Cathodic Protection is an electrical circuit, and works where the environment provides the return path for the current in the circuit (like the water for a ship, or the soil for a pipeline). Also, Couplertec's system is attempting to be Impressed Current Cathodic Protection, but for it to be really effective you would need a lot of small sacrificial anodes spread over the car everywhere where it gets wet (wheelarches, chassis legs, footwells, sills etc), each of which would need to be connected to the DC current source. The current source itself (between 10 and 50A at 50V, according to that wiki article) wouldn't do much for the car's battery either. |
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Mar 31, 2012 12:33:14 GMT
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Could be wrong, but I think its because those things are in the water (oil rig, Boats) Yachts etc have sacrificial annodes. They get attacked and it leaves the rudder / propellor alone.
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Mar 31, 2012 19:17:32 GMT
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Cheers fella's all becomes clear.............
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sparkyt
Posted a lot
selling stuff
Posts: 1,767
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Mar 31, 2012 19:26:39 GMT
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Well done buzby ..
Salt water is a very good conductor (which is why ships don't bond the neutral bar its left floating )
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Mar 31, 2012 22:11:16 GMT
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About as good as the Peter Brock Polarisers ....... |
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