Interactions between Phosphoric/Tannic Acid and Different Forms of FeOOH

Figure 5

SEM images of rust powder/cast iron interface with the effects of ((a) and (b)); Cl⁻ ((c) and (d)); ((e) and (f)); and Cl⁻+ ((g) and (h)).

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)