“…With an increase of 300 and the thickness of the image of the oxide layer in the photo, 2 mm, the actual thickness of the oxide layer was 7 µm. When the thermal diffusivity of the oxide is α = λ / ρc = 4,6 • 10 -6 m 2 / s, the time for the passage of the thermal wave through its thickness, according to (9), is 3,4 • 10 -6 s. In the indicated time interval, the temperature of the oxide layer is constant and corresponds to the data in Table 2. After this interval, the temperature field propagates deep into the substrate metal, where the thermal conductivity is higher.…”