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. 2018 Aug 14;4(8):e00731. doi: 10.1016/j.heliyon.2018.e00731

Fig. 3.

Fig. 3

Mapped section of the sample under conditions when the corrosion reaches the third layer. 1 – external layer, 2 – internal protector, 3 – third layer, 4 and 5 – interlayer boundaries, 6 – lens.