Interesting Behavior of Pachycormus discolor Leaves Ethanol Extract as a Corrosion Inhibitor of Carbon Steel in 1 M HCl: A Preliminary Study

Table 3

Polarization parameters for carbon steel in 1 M HCl at room temperature containing various concentrations of Pachycormus discolor ethanol extract.

Concentration (v/v) %	𝐸corr    (mV/SCE)	𝛽𝑐 (mV/dec)	𝛽𝑎   (mV/dec)	𝑖corr    (μA/cm²)	IE  %
Blank	−471.0	125.8	113.9	442.0	—
0.005	−495.0	136.7	129.1	284.0	35.7
0.001	−490.0	116.9	111.0	237.0	46
0.1 0	−492.0	108.3	94	139	68.55
0.5 0	−465.0	119.2	80.9	114.0	74.20
1.0	−484.0	108.8	78.4	69.20	84.34
2.0	−432.0	167.5	71.0	24.20	94.52