Opuntia ficus-indica Extract as Green Corrosion Inhibitor for Carbon Steel in 1 M HCl Solution

Figure 11

SEM micrographs of carbon steel corroded in uninhibited 1 M HCl solution at (a) 25, (c) 40, and (e) 60°C, and in 1 M HCl solution + 75 ppm of inhibitor at (b) 25, (d) 40, and (f) 60°C.

(a)

(b)

(c)

(d)

(e)

(f)