Corrosion Inhibition of Mild Steel in Acidic Media by 5′-Phenyl-2′,4′-dihydrospiro[indole-3,3′-pyrazol]-2(1H)-one

Figure 9

(a–d) Optimised Geometry, Mulliken charges, HOMO and LUMO density distribution of SPAH.

(a)

(b)

(c)

(d)