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

Table 5

Thermodynamic parameters of Δ𝐻^∘_ads and Δ𝑆^∘_ads for corrosion of Al in alkaline media in the absence and presence of ALG and PEC inhibitors. [OH⁻] = 4.0 and I = 4.0 mol dm⁻³.

Inhibitor	Parameters
	Δ𝐻^∘ads (kJ mol^−1)	Δ𝑆^∘ads (J mol^−1 K^−1)	𝑅^2
Alginate	45.05	217.15	>0.99
Pectates	20.98	141.91	>0.99