Study of Synergistic Effect of Iodide on the Corrosion Antagonistic Behaviour of a Heterocyclic Phenylhydrazone in Sulphuric Acid Medium on Carbon Steel

Table 5

Potentiodynamic polarization parameters of CS specimens in 0.5 M H₂SO₄ at 30°C in the presence of KI and 3APPH + KI.

𝐶(mM)	𝐸corr (mV/SCE)	𝐼corr (𝜇A/cm^2)	𝑏𝑎 (mV/dec)	−𝑏𝑐 (mV/dec)	𝜂pol%
Blank + KI	−475	799	80	123	23.3
0.2 + KI	−507	18.8	85	102	98.2
0.4 + KI	−540	12.6	118	121	98.8
0.6 + KI	−526	11.8	117	105	98.9
0.8 + KI	−515	8.9	102	119	99.1
1.0 + KI	−534	8.5	127	106	99.2