Physicochemical studies of glucose, gellan gum, and hydroxypropyl cellulose—Inhibition of cast iron corrosion

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

“…Glucose, gellan gum, and hydroxylpropyl cellulose have been assessed as green inhibitors for cast iron in acidic environment by means of chemical and electrochemical techniques [31]. It was found that inhibition efficiency increased with increase in the concentration of the inhibitors.…”

“…Therefore, anions in the aqueous medium with smaller degree of hydration will first adsorb on the metal surface, bringing excess negative charge close to the interface and favoring further adsorption of polycations via electrostatic attraction. Hence, physical adsorption mechanism is mostly proposed for most of the studied polymers studied [16,22,25,31,35]. However, in cases where chemical adsorption mechanism prevails, Umoren et al [26] explain that the inhibitor molecules exist as protonated species in equilibrium with the corresponding neutral species.…”

“…Physisorption is consistent with the electrostatic interaction between charged molecules and the charged metal surface while chemisorptions involves charge sharing or transfer from organic molecule to the metal surface to form coordinate type of bond. Results of most researches [16,22,25,31,35] showed that most polymers exist as polycations in acid medium (most studied environment). This makes it difficult for the polycations to approach the positively charge metal surface.…”

“…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.…”

Characteristics of biofilms and iron corrosion scales with ground and surface waters in drinking water distribution systems

“…Therefore, previous studies of iron pipe corrosion have focused on pipe degradation, corrosion scale formation, and iron release. A large number of factors were examined for their influence on iron pipe corrosion parameters, including water quality and composition, flow conditions, biological activity, and corrosion inhibitors [9][10][11]. In particular, some contradictory results have appeared on the effects of chloride and sulfate on iron corrosion [1,12,13], so the LarsonSkold Index does not provide an effective means of controlling iron corrosion, and biofilms may be used as an alternative method to combat corrosion [14].…”