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. 2021 May 27;11(31):19294–19309. doi: 10.1039/d1ra03083c

Fig. 10. AFM 3d photos of: (a) carbon steel free surface, (b) carbon steel in 1 M HCl only, (c) carbon steel in 1 M HCl + 20 × 10−6 M of H4, (d) carbon steel in 1 M HCl + 20 × 10−6 M of H5, (e) carbon steel in 1 M HCl + 20 × 10−6 M of H6 (after 24 hours of immersion).

Fig. 10