Inhibition of Mild Steel Corrosion in Sulphuric Acid Using Esomeprazole and the Effect of Iodide Ion Addition

Table 6

Tafel polarization for the corrosion of mild steel in 1 M H₂SO₄ in the absence and presence of different concentrations of esomeprazole with the addition of KI.

Inhibitor concentration (ppm)	β a (mV)	β c (mV)	−𝐸corr (mV/SCE)	𝐼corr (mA/cm^2)	Linear polarization (R)	IE (%)
Blank	8.6330	6.463	494.2	1.4060	20.5	—
50	10.168	6.951	473.9	0.6035	42.1	57.08
100	9.9790	5.516	454.9	0.4942	56.8	64.85
150	11.854	5.897	502.3	0.3493	70.1	75.16
200	11.232	5.891	465.1	0.2826	89.9	79.90
250	8.0010	6.316	516.4	0.2264	134.1	83.90
300	10.955	6.847	517.8	0.2142	114	84.76
25 ppm KI	13.094	6.757	508.1	0.1778	122.5	87.35
50 ppm KI	7.5050	5.898	490.0	0.1120	289.7	92.03