Research Article

Synergistic Effect of KI on Corrosion Inhibition of Mild Steel by Polynuclear Schiff Base in Sulphuric Acid

Table 1

Calculated values of inhibition efficiency ( %) for MS corrosion in 0.5 M H2SO4 for different systems at 30°C from weight loss measurements.

Systems/concentrationsCorrosion rate 
(mm/y)
Inhibition efficiency 
( %)

Blank24.01
Blank + 0.2 mM KI19.4019.160.19
0.2 mM A9O3AP18.0624.770.25
0.4 mM A9O3AP17.1928.380.28
0.6 mM A9O3AP15.9633.540.34
0.8 mM A9O3AP14.5839.250.39
1.0 mM A9O3AP13.5043.750.44
0.2 mM A9O3AP + 0.2 mM KI10.8854.670.55
0.4 mM A9O3AP + 0.2 mM KI10.2257.410.57
0.6 mM A9O3AP + 0.2 mM KI9.0862.160.62
0.8 mM A9O3AP + 0.2 mM KI6.8471.490.71
1.0 mM A9O3AP + 0.2 mM KI5.5876.750.77