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Electrical question for Dell (and anyone else).

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Randyr

03-10-2006 07:32:22

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Good to see you back in the forum Dell.
My question is off topic, but I thought you would be able to answer it.
I have seen ads for electronic corrosion control for vehicles, where a module connected to the battery's + and - posts sends a high volt, but extremely low amp current to several anodes stuck to the body in areas that are not protected from weather too much so they get the rain, road salt spray. You have to make a scratch under the anode so it has metal contact. They don't claim total, 100% rust prevention, but do claim to greatly extend the service life of the metal. So since electrical engineering is what you do, what would your opinion be on this?
Can it actually work, should it be tried, or is it bunk?
FWIW, I've seen it offered at a car dealer.
Thanks.

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Dave L

03-10-2006 16:59:28

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Re: Electrical question for Dell (and anyone else) in reply to Randyr, 03-10-2006 07:32:22

Not Dell either but,I had a 72 Imperial restored and I know how fast the old ones can re-rust.These had been in use on ocean going boats fer quite a while and were new fer cars but I put one on .It really did what I think was a good job slowing the rust down.I sold the car 15 yrs later and the rust was just beginning to show on the front fender bottoms.Nothing stops it all but it helped a bunch and the cost was werth it.Just my 2 cents
Dave

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Greg_Ky

03-10-2006 12:56:46

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Re: Electrical question for Dell (and anyone else) in reply to Randyr, 03-10-2006 07:32:22

Can you say scam?

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Dell (WA)

03-10-2006 11:25:42

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Re: Electrical question for Dell (and anyone else) in reply to Randyr, 03-10-2006 07:32:22

Randy..... ....your confidence in me is "flattering", but I wouldn't touch that with a 10-ft pole ...er... 12-volt battery? Its almost in the same arguement about positive ground or negative ground. Theory is there but the practicality isn't. After reading some of the other comments, PT Barnum was right: "Sucker born every minute".

But what you are enquiring about strikes me as another of those "dealer extra-profit opportunities"; along with life-time wax coatings, clear plastic seatcovers; and extended warrantees.

Don't get me wrong, there is a place for electrolysis, in the de-rusting tank, or chrome plating tank.

My advice, save your money..... ....respectfully, Dell

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Randyr

03-11-2006 07:00:48

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Re: Electrical question for Dell (and anyone else) in reply to Dell (WA), 03-10-2006 11:25:42

I'll take that as good advise, thanks.

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DD-8N-Mi

03-10-2006 09:35:54

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Re: Electrical question for Dell (and anyone else) in reply to Randyr, 03-10-2006 07:32:22

What you are talking about is an attempt at an impressed current system to provide cathodic protection. They are attempting to deliberately making a galvinic cell but using the battery to power the cell rather than letting another material form it. It is not a system that is suited to protecting a vehicle out of the water as it is necessary to work the cathode and anode against each other thru an electrolyte to provide an ionic path from the anode to the vehicle body. If your vehicle were submerged in water it would work like a champ but then you would have bigger things to worry about than rust!

Another way to tell is look at how much current it draws from your battery. For steel you need about 50 ma per square meter of surface area. For a vehicle you could be drawing .25 amps ALL the time. I bet it isn't happening. If you are not drawing current you are not protecting metal.

The easier way for us common folks to protect metal is to galvanize it or use a barrier coat (like coal tar epoxy) to coat it. You cannot just put a few bars on zinc on something to protect it either unless it is under water.

If it were this easy you could bet you would see a system like this on every bridge in the country. Sorry but I think this one belongs in box with the snake oil.

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RoNofohio

03-10-2006 08:58:37

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Re: Electrical question for Dell (and anyone else) in reply to Randyr, 03-10-2006 07:32:22

For what it's worth. I have a 93 F-150 that I had installed the electronic system shortly after buying my truck. First thing that happened is the drive shaft became totally encrusted with rust. Had to be replaced. Then the frame, crossmembers, mufflers, pipes, and any other exposed surfaces under the truck. The factory sprayed the frame with a black plastic like coating to prevent rust, but the cathodic protection system ate through that and it pealed off like banana skins. Then it attacked the cab (at the bottom) and the rear quarterpanels. Bottom line is my truck is now a rusty hulk, but still runs good. So I just swallow my pride when I have to drive it and go. I was told that probably most of my problems came from the running boards that I also had installed at the same time and not the rust protection system. Don't know, but I can tell you that from my experiences, I will never use this method again. JMHO...Ron

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K.LaRue-VA

03-10-2006 08:41:48

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Re: Electrical question for Dell (and anyone else) in reply to Randyr, 03-10-2006 07:32:22

Not Dell either but, if you do a couple of quick searches on the web for things like cathodic protection or rust preventor and you will get many many suppliers of the system you are looking for. The old favorite, JC Whitney even sells a version. These types of systems have been in use on boats for years and they really do work up to a point. Once your sacrificial material is gone it has to be replaced and might even start working in reverse! You only get what you pay for and sometimes not even that. Try to deal with a reputable business or do it yourself. I prefer the passive systems that do not require any outside source of current but there is something to be said for knowing for sure which way the electrons are flowing. I'm using a similar active system to remove rust from old parts with a 12-volt battery charger. See the link

Electrolysis

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tim in pa

03-10-2006 08:12:38

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Re: Electrical question for Dell (and anyone else) in reply to Randyr, 03-10-2006 07:32:22

randy, i am not dell... but here goes! i have an f-150 that i had the electronic rust preventer installed ($400) in '95. it definitely minimized rust from occuring, and i live in pa = much road salt. now, when rust did occur and i made a claim to have it repaired the business went bankrupt (no doubt), but ford refunded my $400. net result, i have a truck with much less rust then normal. mine did work, but not completely. hth

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