Fig. 4

The appearance of cross-sections of samples 1–4 (left) and the microstructure of the corresponding upper paint layers (central column) and ground (right) in the phase contrast mode (according to SEM)

The appearance of cross-sections of samples 1–4 (left) and the microstructure of the corresponding upper paint layers (central column) and ground (right) in the phase contrast mode (according to SEM)