Influence of Chemical Corrosion on Pore Structure and Mechanical Properties of Sandstone

Figure 3

NMR images of specimens after treatment with different times of chemical corrosion: (A) 0 days; (B) 10 days; (C) 20 days; (D) 30 days; (E) 40 days; and (F) 50 days.

(a) H₂SO₄ solution

(b) Distilled water

(c) NaOH solution