rust and corrosion

C

charliebeau2005

New Member

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2

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cheshire

• Dec 30, 2010

• #1

Hi does anyone know about rust prevention via cathodic or sacrifficial metal protection for landrovers (disco). My understanding of it is you reverse the polarity of the battery and place a block of zinc between the battrey strap and the bodywork. However I need to be sure I don't damage the electrical system, has anyone any information
Charlie

 

The Mad Hat Man

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LZIR Despatch Agent

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Embasinga stocæ

• Dec 30, 2010

• #2

Been discussed before.

I think that the outcome is that Landrover have already achieved it with the alloy panels being the sacraficial elements; but that it isn't very effective.

 

R

ricc

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central somerset

• Dec 30, 2010

• #3

surely if you reverse the battery polarity at best youll stop everything electronic from working at bworst therell be smoke coming from all the black boxes.

 

The Mad Hat Man

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LZIR Despatch Agent

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Embasinga stocæ

• Dec 30, 2010

• #4

Why do yu think manufs changed from +ve earth systems to -ve earth ststems about 50 years ago? It was to reduce electrolytic corrosion.

 

C

charliebeau2005

New Member

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cheshire

• Dec 30, 2010

• #5

Thanks for the info' Charlie

 

Oddie

AntiSeptic Sandal Wearer

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In a puddle in Kernow

• Dec 30, 2010

• #6

You can't create a sacrificial anode and give something that is normally surrounded by air cathodic protection as it needs to be in contact with the metal it is sacrificing itself for (at least by something through which electricity can pass) - Pipes are in contact with damp soil, ships in contact with water, so can be cathodically protected. A chassis is mostly in contact with air which can't carry the electrical charge needed to transfer the corroding ions to the sacrificial anode so unless it's permanently underwater, it can't be done.

The best you can get is to paint it with a high zinc content metallic paint. (or galvanise it)

 

johnny curt 1

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9,118

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manchester

• Dec 30, 2010

• #7

kind of morbid use fer sacrificial protection but 3 minutes in its mentioned on this and gives a breif description of how and why and what it does [nomedia="http://www.youtube.com/watch?v=rj0Imm_Y0y4"]YouTube - Casket - Science of Death[/nomedia]