With 14 years of experience with industry-first purpose built test-simulators a lot of discoveries have been made. Beside tests in practice and in the laboratory TRYDEL utilizes its "camera-in-wheel"-monitoring to describe the dynamic processes taking place inside the tyre.
Corrosion caused by wheel-electrification
The process of tyre and wheel electrification on moving vehicles is due to a partial separation of electrons from protons and electrons being transferred from one body to another.
Chemical bonds are formed when surfaces touch each other and if the tyre's surface holds electrons more securely, that surface will steal electrons away from the wheel surface. These surfaces then become oppositely charged by acquiring a polarity imbalance. Protons have a positive charge, electrons are negative.
When a vehicle is operating, the tyre surface is continually stripped of electrons and therefore leaves an excess of protons behind while the rim surface gathers an excess of electrons. To maintain a polarity balance a stream of electrons continually revert and jump back (as in spark) from rim to tyre.
Trydel-Lab tests have duplicated and proven that what has been described in the industry as scuff marks on tyre beads and wheel rims are in fact the site where separated electrons return.
These tests were conducted using laboratory apparatus to mount a tyre and rim section that placed the contact surfaces of bead and rim in exactly the same configuration as with a normally mounted tyre.
The test requires high-voltage be passed through the rim section with the tyre section earthed out.
Sparks discharging between rim and bead were clearly evident in the same proximity as the "scuff' mark in question. After close inspection it was clear the laboratory test had proven the sparks were active in precisely the same location as the "scuff" mark.