how it works

What can be PROTECTED?


CouplerTec’s Patented ‘Capacitive Coupling Technology’ is an Electronic corrosion control process that can be used on any mobile or fixed above ground (non submerged) application such as; motor vehicles (cars, trucks buses), heavy machinery/equipment (tractors, forklifts, graders, loaders, dozers, excavators and cranes etc), towers, generators and sheds. Almost any above ground metal structure can be protected using CouplerTec’s Patented Capacitive Coupling Technology.


Rust is the normal electrochemical process of metals returning to their natural unrefined state. It occurs when Iron, Oxygen and Water (air moisture) combine. The rusting process can be accelerated when Iron is subjected to nature’s minerals, chemicals and temperature fluctuations.


CouplerTec’s Patented Capacitive Coupling Technology is demonstrably different from the more traditional forms of electronic corrosion control because it was specifically designed from the outset to operate in an open air environment, unlike Impressed Current Cathodic Protection (ICCP) which requires a relatively abundant conductive medium (moist soil or water) completely surrounding the metal object being protected.

Iron and oxygen have opposite charges so they seek out each other to combine. When they combine, the iron loses electrons to oxygen atoms. This is called oxidation and when it happens it produces a chemical reaction forming Fe2O3 Iron Oxide otherwise known as Ferric Oxide, or more commonly known as rust.

why does rust happen?

how couplertec's capacitive coupling technology works

CouplerTec’s Patented Capacitive Coupling Technology interferes with the electrical charge between Iron and Oxygen so it becomes hard for these elements to combine to form rust. In other words, the technology interferes with the metal’s ability to react with Oxygen.

CouplerTec’s Capacitive Coupling Technology achieves this by creating a negative (-) electrostatic surface charge on the metal surface of the protected structure. The (-) Oxygen atom is repelled by the (-) electrostatic surface charge.

This (-) electrostatic surface charge is created by building a Capacitor within the protected structure. A capacitor is an electrical component used to store a charge, consisting of two conducting surfaces separated by a nonconductive dielectric. The CouplerTec system consists of two components that we use to build our Capacitor within the protected structure.

The first component is our CouplerTec Electronic Module which is connected to a 12V power source, either a 12V Battery or 12V power pack plugged into mains power (mainly used for static structures).

The module draws a very small charge from the power source and transforms this into an output voltage of 400V (Peak) and from 200V (RMS typical), strong enough to easily be read on a volt/multi-meter. The CouplerTec module generates frequency signals in the 200KHz range. The voltage and frequency created by the module is then transferred to the second component, which is our Capacitive Coupler.

The Capacitive Coupler is a conductive plate which is affixed directly onto the painted surface of the structure using a high bond adhesive. The Capacitive Coupler, when charged by the voltage now acts as the positive plate’ of the Capacitor that we are building. The frequency applied to the Capacitive Coupler combined with Capacitance induces the electrostatic charge to the metal surface of the structure. This then makes the structure act as the negative plate of the Capacitor. Electrons are accumulated between the Positive and Negative plates of the Capacitor. The frequency which induced the charge also disperses these electrons across the surface of the structure.

The structures paint work becomes the ‘dielectric’ which in turn will hold the electrons on the metal surface and stop them from flowing away. Should a protected structure’s paintwork become compromised (e.g. stone chip or scratch) resulting in exposed bare metal, then over time a very thin layer of surface rust may eventually form on the bare metal surface. This layer of surface rust takes the place of the paint work and becomes the dielectric, which in turn holds the charge static. The surface rust will turn a dark brown colour, this is non-active ferric oxide and will not progress any further.


Internationally PATENTED Technology

All CouplerTec™ Electronic Rustproofing systems are fully digitally controlled using state of the art microprocessor technology, similar to that found in current mobile phones. The microprocessor is programmed with a process called ‘monitored and controlled performance’. This is where the microprocessor monitors and controls the activity between each internal circuit and their own dedicated Capacitive Coupler. This ensures that the required level of energy, frequency and capacitance is applied constantly via the capacitive coupler to induce the electrons throughout the body of the vehicle / structure

The CouplerTec system confirms that it is working correctly by way of a Green flashing L.E.D (light emitting diode). Conversely, the system will also indicate the detection of a fault by way of a Red flashing L.E.D. In the event of a fault, the system will automatically reset after the fault has been rectified. The electronics are Solid State (which means there are no moving parts) and the electronic board is encapsulated in an epoxy resin which makes it air tight and water tight. Therefore, these systems will enjoy an indefinite life span.

Couplertec rustproofing works