With the development of technical means of increasing popularity gained in situ of research that allow to observe the development of the process in time. This is particularly important for processes that occur locally. Corrosion of metals is characterized by the occurrence of local events on the surface - the formation of pits, gas bubbles, the development of cracks. Monitoring the progress of these external manifestations of corrosion leads to a deeper understanding of its mechanism and its dependence.
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