A Revisit to the Corrosion Inhibition of Aluminum in Aqueous Alkaline Solutions by Water-Soluble Alginates and Pectates as Anionic Polyelectrolyte Inhibitors

Table 1

The corrosion rates (𝑅_𝑐) for corrosion of Al in alkaline media in absence and presence of inhibitors. [OH⁻] = 4.0 and I = 4.0 mol dm⁻³ at 30°C.

[Inhibitor]; mol dm^−3	0.0	0.01	0.02	0.03	0.04
Alginate	0.52 (0.48)*	0.33	0.28	0.22	0.16
Pectates	0.52 (0.48)*	0.25	0.20	0.15	0.11

 *Calculated from the weight-loss method.