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grafty99



Member Since: 15 Aug 2012
Location: North Devon
Posts: 4785

United Kingdom 2002 Defender 90 Td5 HT Caledonian Blue
Electronic rust prevention
Has anyone heard of this before? Not sure if it you work, seems a bit dubious to me Confused

 2002 90 Td5 Station Wagon
1990 Vogue SE
Triumph Tiger Explorer 1200
Td5 90 Thread http://www.defender2.net/forum/topic50767.html
Tdi 110 Thread https://www.defender2.net/forum/topic69562.html
RRC Thread http://www.defender2.net/forum/topic54492.html
Instagram http://www.instagram.com/george_grafton
Post #418898 25th Apr 2015 9:50am
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munch90



Member Since: 26 Oct 2013
Location: guildford
Posts: 3558

England 
heard about such things , but never seen one or heard anyone whos tried one
Post #418899 25th Apr 2015 9:54am
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grafty99



Member Since: 15 Aug 2012
Location: North Devon
Posts: 4785

United Kingdom 2002 Defender 90 Td5 HT Caledonian Blue
I suppose it makes sense, they changed from positive earth vehicles because of accelerated rust if I'm not mistaken? 2002 90 Td5 Station Wagon
1990 Vogue SE
Triumph Tiger Explorer 1200
Td5 90 Thread http://www.defender2.net/forum/topic50767.html
Tdi 110 Thread https://www.defender2.net/forum/topic69562.html
RRC Thread http://www.defender2.net/forum/topic54492.html
Instagram http://www.instagram.com/george_grafton
Post #418903 25th Apr 2015 10:15am
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Nevillerover



Member Since: 14 Feb 2015
Location: Suffolk
Posts: 224

United Kingdom 2007 Defender 110 Puma 2.4 XS CSW Sumatra Black
Boats use something like this but I'm confused. Why would they apply a "frequency" when they want to make the car body negative? That implies an alternating voltage when it seems to me they need DC.
Anyway, with half a Landy being aluminium and maybe or maybe not very well joined electrically to the chassis, I think this is best kept down under.
Post #418904 25th Apr 2015 10:16am
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grafty99



Member Since: 15 Aug 2012
Location: North Devon
Posts: 4785

United Kingdom 2002 Defender 90 Td5 HT Caledonian Blue
According to the video, it ranges between 200-400 volts, this I assume, is easier and less power hungry to achieve with ac rather than dc? 2002 90 Td5 Station Wagon
1990 Vogue SE
Triumph Tiger Explorer 1200
Td5 90 Thread http://www.defender2.net/forum/topic50767.html
Tdi 110 Thread https://www.defender2.net/forum/topic69562.html
RRC Thread http://www.defender2.net/forum/topic54492.html
Instagram http://www.instagram.com/george_grafton
Post #418905 25th Apr 2015 10:21am
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LRmud



Member Since: 22 Oct 2014
Location: IV12 Highland
Posts: 198

Scotland 1989 Defender 90 300 Tdi HT Baltic Blue
Sounds like rubbish to me. Avoid. --------------------------------------------------------------------------------------------------
1989 Defender 90
Toyota Aygo & Honda FR-V
Post #418912 25th Apr 2015 11:08am
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JWL



Member Since: 26 Oct 2011
Location: Hereford
Posts: 3443

England 2002 Defender 110 Td5 SW Coniston Green
Be a good start to theft prevention Whistle Perhaps up it to 1000V
Post #418917 25th Apr 2015 11:27am
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grafty99



Member Since: 15 Aug 2012
Location: North Devon
Posts: 4785

United Kingdom 2002 Defender 90 Td5 HT Caledonian Blue
Well they put sacrificial anodes on boats so perhaps something like that would work?

And no, the bodywork shouldn't be a sacrificial anode Rolling with laughter 2002 90 Td5 Station Wagon
1990 Vogue SE
Triumph Tiger Explorer 1200
Td5 90 Thread http://www.defender2.net/forum/topic50767.html
Tdi 110 Thread https://www.defender2.net/forum/topic69562.html
RRC Thread http://www.defender2.net/forum/topic54492.html
Instagram http://www.instagram.com/george_grafton
Post #418918 25th Apr 2015 11:34am
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K9F



Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610

United Kingdom 2008 Defender 90 Puma 2.4 XS CSW Stornoway Grey
I work in the marine industry and whilst sacrificial anodes and galvanic isolators are very, very effective of reducing (not preventing) corrosion I can see perhaps a slight flaw when it comes to Defender application as did Nevillerover. A boat sits in water which is a perfect earth and conductor. The Defender is manufactured from different materials which quite often can be difficult to find an earth at the same potential as the battery earth. With the application/fitment olf this gismo should the entire vehicle not be at the desired potential will the panels/areas not at that potential possibly be subjected to increased corrosion as a result? All pie in the sky and speculative I know.

Ultimately all any corrosive process needs is two different potentials, moisture and oxygen. Using the correct fasteners, isolating 'bolt ons' with gasket or wet assembly with a decent sealant and of course waxoyl or Dinitrol to prevent oxidisation is still the most proven and effective method along with regular monitoring for any deterioration. If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!
Post #418932 25th Apr 2015 2:06pm
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gilarion



Member Since: 05 Dec 2013
Location: Wales
Posts: 5108

Wales 2007 Defender 90 Other CSW Trident Green
I have just had my narrow boat hull blacked with Two Pack Epoxy, while it was in dry dock I asked about the anodes and what they were for and got the same answer as you gave K9F. Although through interest I looked them up on the internet and got this good description.

If two metals are in a conducting liquid, i.e. water, and connected together a current will flow between them. This is how a battery works. As water is a poor conductor the current will be very small, but as it is there 24 hours a day, 7 days a week the cumulative effect can be significant. On a boat with brass skin fittings, a brass propeller and even slightly different grades of steel can all effectively become the plates of a battery and as metal will be removed from one side by going into solution to release the electrons, corrosion will occur. This is the dreaded “galvanic corrosion” that gives rise to pitting.

I did not have to have them replaced on my boat as the condition of them was good. For those who like Welsh Mountains and narrow boats have a look at my videos and photos at..

http://www.youtube.com/user/conwy1
Post #418956 25th Apr 2015 4:15pm
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K9F



Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610

United Kingdom 2008 Defender 90 Puma 2.4 XS CSW Stornoway Grey
gilarion wrote:
As water is a poor conductor


Question Question

Really??? Shocked If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!
Post #418980 25th Apr 2015 6:03pm
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Eduardo



Member Since: 28 Aug 2008
Location: Región Metropolitana
Posts: 2109

Chile 2007 Defender 110 Puma 2.4 SW Stornoway Grey
^^^^^^^

Yep, Gilarion is rigth

Water itself is considered non conductive (do the test with deionized water).
But if you put salt in it is another history.
More salty more conductive. So you have more possibility to conduct electricity in sea water than in a tap water.

Ultra pure water can have 5.5 · 10-6 S/m
Tap water have 0.005 – 0.05 S/m
and Sea water have 5 S/m

Anyway those values are not too much compared with the cooper with 5.96×10+7 S/m
But on the other side is more than rubber 1x 10−14 S/m and teflon 1 x 10-23 S/m


Cheers Eduardo

MY 2007 110 SW PUMA 2.4: Big Fog of 64'
MY 1994 Jayco 1207 Folding camper: "El Tremendo"

Click image to enlarge
Post #419025 25th Apr 2015 8:32pm
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K9F



Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610

United Kingdom 2008 Defender 90 Puma 2.4 XS CSW Stornoway Grey
K9F wrote:
I work in the marine industry


Rolling with laughter

That'll be salt water then....... Thumbs Up If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!
Post #419046 25th Apr 2015 11:25pm
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Eduardo



Member Since: 28 Aug 2008
Location: Región Metropolitana
Posts: 2109

Chile 2007 Defender 110 Puma 2.4 SW Stornoway Grey
Yep K9F, but the point is not the water itself is the salt that contains Thumbs Up

For this reason cars used near the sea and when salt is used in the roads are more propensive to rust than the ones used inlands in more warmer climates.

Cheers Eduardo

MY 2007 110 SW PUMA 2.4: Big Fog of 64'
MY 1994 Jayco 1207 Folding camper: "El Tremendo"

Click image to enlarge
Post #419051 26th Apr 2015 3:30am
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Buccaneer



Member Since: 11 May 2014
Location: London/Kabul
Posts: 148

United Kingdom 1998 Defender 90 V8 Petrol 50th Auto Atlantis Blue
I have used vehicles that pass a current through them on a perm basis to indicate whether something has been attached to the vehicle. Anything that is attached disrupts the field on the car and flashes up something has been attached. The Rules:-
1 Buccaneer comes back alive.
2 Chicks dig scars.

GB260
Post #419053 26th Apr 2015 4:45am
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