In-situ detection of single particle impact, erosion/corrosion and surface roughening

Particle impact is technologically important and can cause significant damage to a surface. Detecting the approach of particle would give key information on process. High-speed imaging this process gives particle's velocity movement but does not answer questions relating changes in electrochemical properties surface caused by resultant impact. Furthermore, it difficult apply non-transparent media. To gain information, we have deployed high-speed impedance technique with ability determine uncompensated resistance, Faradaic current effective capacitance an electrode. This has time resolution 1.25 μs. Individual impacts sand particles fluid jet (jet ~4–5 m s−1) are used erosion/corrosion aluminium interface. Surface shown change after individual impacts, which preceded detection as approached solid/liquid For first time, in-situ roughening electrode reported for single A link between mass loss overall erosion shown, equivalent rate 8.5 F g−1 determined from data. study shows how particles, they interface, be detected high precision new insight. will improve our understanding erosive environments.