Table 2: Electrochemical polarization parameters for aluminium alloy in 0.05 M NaCl solution in the absence and presence of ferrous gluconate at 28°C.

Concentration of inhibitor
(g/mL)
Current density
(A/cm2)
Anodic Tafel constant
(V/dec)
Cathodic Tafel constant
(V/dec)
Linear polarization
( cm2)
Corrosion potential
(V)
Corrosion rate
(mm/yr)

0.0 0.050870.08004 −0.758930.27787
0.5 0.170810.39458 −1.056400.02334
1.0 0.749041.50350 −0.343180.00016
1.5 0.524920.54034 −0.573670.00554
2.0 1.926700.96634 −0.343180.00021