Kinetics of Corrosion Inhibition of Aluminum in Acidic Media by Water-Soluble Natural Polymeric Pectates as Anionic Polyelectrolyte Inhibitors

Abstract

Corrosion inhibition of aluminum (Al) in hydrochloric acid by anionic polyeletrolyte pectates (PEC) as a water-soluble natural polymer polysaccharide has been studied using both gasometric and weight loss techniques. The results drawn from these two techniques are comparable and exhibit negligible differences. The inhibition efficiency was found to increase with increasing inhibitor concentration and decrease with increasing temperature. The inhibition action of PEC on Al metal surface was found to obey the Freundlich isotherm. Factors such as the concentration and geometrical structure of the inhibitor, concentration of the corrosive medium, and temperature affecting the corrosion rates were examined. The kinetic parameters were evaluated and a suitable corrosion mechanism consistent with the kinetic results is discussed in the paper.

Corrosion Inhibition of Aluminium in 2 M Phosphoric Acid Using the Essential Oil of Mentha Pulegium Leaves

“…It has also been noticed that the addition of the inhibitor to the test solution gives lesser negative values of ΔS* than in the absence of the inhibitor, i.e., it decreases the corrosion rates. This result may be considered as an indirect evidence to support the cited proposed mechanism [21]. Figure 8.…”

Recent Developments on the Use of Polymers as Corrosion Inhibitors - A Review

“…Temperature was found to have profound effect on the inhibition efficiency; a severe decline from 91% at 10 o C to 31% at 40 o C with the same concentration of pectin was reported. Hassan and Zaafarany [25] studied the corrosion inhibition of aluminum (Al) in hydrochloric acid by anionic polyelectrolyte pectates as a [35]; [37] Carboxymethyl Cellulose H2SO4, HCl Mild steel [16,22,29] Gum Arabic HCl Mild steel [32] Hydroxy-ethyl cellulose HCl Mild steel; Aluminium [30]; [30] Gellan gum HCl Cast iron [31] water-soluble natural polymer polysaccharide using gasometric and weight loss methods. Results of the investigation revealed that the inhibition efficiency offered by inhibitor increased with increase in the concentration but decreased with rise in temperature.…”

Adsorption and corrosion inhibition behavior of polyethylene glycol on α-brass alloy in nitric acid solution

“…The use of polymers as corrosion inhibitors has attracted considerable attention recently. The polymers utilized as corrosion inhibitors have been highly considered newly due to the following factors: (1) they are low cost and are stable to metallic materials in aqueous solutions, (2) proprietorship of multiple sites' adsorption, and (3) some studies concluded that their functional groups can form complexes with metal ions' surface and protect the surface of metals (16)(17)(18)(19)(20). Some polymers are declared as corrosion inhibitors in dissimilar destructive media (21)(22)(23)(24).…”