Naked Science Forum

Non Life Sciences => Chemistry => Topic started by: thedoc on 02/12/2014 01:30:02

Title: Does electronic rust proofing work?
Post by: thedoc on 02/12/2014 01:30:02

Mehrad Moin asked the Naked Scientists:
   
I live in Montreal, Canada, they use tons of salt during the winter for obvious reasons, and this kills your car, making it extremely vulnerable to rust.

What do you think about electronic rust proofing?

What about a "sacrificial metal", in other words a piece of zinc material connected to the body of your car to rust instead of the car itself?

What do you think?

Title: Re: Does electronic rust proofing work?
Post by: CliffordK on 02/12/2014 05:27:58

The notes I'm seeing on the web indicate that the Electronic Rust Protectors don't really do anything (http://corrosion-doctors.org/Car/car-electronic-rust.htm).

However, I remember hearing that negative ground reduces body corrosion on cars, boats, and etc.  So, you already have a large 12V battery connected to your chassis to reduce the corrosion.  I have to wonder a little bit as one ends up with a circuit through both battery poles. 

Zinc does help, especially if you can galvanize the entire frame/body (which should be done on modern cars in the factory).  Perhaps a sacrificial anode will help a bit, especially for metal very close to one's anode.