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RustStop® RS-5 electronic rust prevention and other rust protection products - Serving the Americas, Europe and Russia |
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Rust is more of a threat than you may think! What is electronic rust proofing (rustproofing)? Undercoating and Rust Proofing (rustproofing)? What is RustStop® electronic rust protection? How does RustStop® electronic rust prevention work? Are you serious about car care?
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Capacitive Coupling Limitations
Corrosion (rust) is a process where chemical reactions take place through the exchange of electrons. The corrosion reactions that would otherwise naturally occur can be inhibited by preventing the exchange of electrons.
Capacitive Coupling is an electronic rust prevention system used by some products. The system's positive electrode acts as the positive side of the capacitor effect and the vehicle forms the negative side with the paintwork as the dielectric (insulator). Some systems add an additional dielectric material between the vehicle and the positive electrode. Because of the dielectric (insulator), the positive electrode is insulated from the vehicle and the claims are that the positive electrode attracts the electrons from any scratches in the paintwork of a vehicle to disrupt the formation of rust.
Capacitive Coupling can work if there is a continuous electrolyte (water) path from the scratch to the positive electrode.
When there is not a continuous electrolyte (water) path present, there is no possibility of electron flow between the positive electrode and the metal of the vehicle, hence zero rust protection. The free electrons (e) at the scratch can now readily react to form rust, see diagram.
It is possible for this system to work on a metal surface in wet conditions. Capacitive Coupling relies on an electrolyte (puddle of water) to form a continuous electrical path, between the positive electrode and any scratches that form, allowing electron flow to disrupt the rusting process.
Unfortunately, the positive electrodes of Capacitive Coupling systems usually cannot be mounted where water frequently comes in contact with them. They are typically mounted in the engine compartment, behind a taillight or in some other interior area that rarely or never gets wet. Because of this, there is rarely or never a continuous electrical path (puddle of water) between the positive electrodes and the metal of the vehicle. This means the vehicle is not being protected properly and it will rust.
Therefore, there are rust protection systems available for vehicles that are much more effective than Capacitive Coupling systems.
Click here to see: Cathodic Protection Limitations?
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