Role of hydroxyl group in cerium hydroxycinnamate on corrosion inhibition of mild steel in 0.6 M NaCl solution

Corrosion protection mechanism of Ce4+/organic inhibitor for AA2024 in 3.5% NaCl

“…[14][15][16][17][18] In general, the organic component is responsible for adsorption onto the metal surface through heteroatoms (N, O, S, and P), double/triple bonds or aromatic rings. [19][20][21] Cerium salts have been widely used as corrosion inhibitors, 11,[22][23][24][25] where the essential step of the inhibition mechanism involving cerium species, in an aerated neutral solution, is the formation of insoluble cerium oxides and/or hydroxides on the cathodic sites, where the oxygen reduction reaction is inhibited. [25][26][27] A number of workers have investigated the synergism of cerium with inorganic [28][29][30][31] and organic 8,30,[32][33][34] materials as corrosion inhibitors.…”

Analysis of inhibitory properties of neodymium tartrate and comparison with neodymium chloride for mild steel in neutral sodium chloride solution

“…Many studies took the strategy of designing inhibitors in such a way as to use the inhibition properties of both inhibitors synergistically. As a result, rare earth carboxylate compounds are synthesized that prevent corrosion through a mixed inhibition mechanism (Nam et al, 2019;Somers et al, 2020). Numerous studies have examined the effectiveness of cerium carboxylate compounds such as cerium citrate, cerium hydroxyl cinnamate, cerium tartrate, cerium salicylate, cerium anthranilate and cerium glycolate for mild steel in NaCl solution (Forsyth et al, 2002a(Forsyth et al, , 2002bForsyth et al, 2002aForsyth et al, , 2002bBlin et al, 2004Blin et al, , 2006Hu et al, 2015;Nam et al, 2019;Marunki c et al, 2022).…”

“…As a result, rare earth carboxylate compounds are synthesized that prevent corrosion through a mixed inhibition mechanism (Nam et al , 2019; Somers et al , 2020). Numerous studies have examined the effectiveness of cerium carboxylate compounds such as cerium citrate, cerium hydroxyl cinnamate, cerium tartrate, cerium salicylate, cerium anthranilate and cerium glycolate for mild steel in NaCl solution (Forsyth et al , 2002a, 2002b; Forsyth et al , 2002a, 2002b; Blin et al , 2004, 2006; Hu et al , 2015; Nam et al , 2019; Marunkić et al , 2022). Only a few studies have been conducted using other rare earth metal complexes.…”

Electrochemical and Surface Characterization Study on the Corrosion Inhibition of Mild Steel 1030 by the Cationic Surfactant Cetrimonium Trans-4-hydroxy-cinnamate

“…It was hypothesized that the hydroxyl groups interact with the metal surface by hydrogen bonding, and in the case of the ortho substitution (2-OH-cin), the aromatic ring is shielded, preventing further interactions and forming a uniform film compared to the ortho substitution (4-OH), where a multilayered film with cracks was observed by scanning electron microscopy (SEM) analysis. 10 In addition to lanthanum and cerium counterions for cinnamate compounds, other rare-earth elements have also been tested; e.g., praseodymium 4-hydroxycinnamate, Pr(4OHCin) 3 , was reported to inhibit cathodic and anodic reactions simultaneously on mild steel immersed in saturated CO 2 saline solutions by forming a densely packed crystalline film. 11 Similarly, yttrium 4-nitrocinnamate, Y(NO 2 Cin) 3 , showed good corrosion inhibition properties of mild steel in saline solutions, where surface analysis indicated the Y(NO 2 Cin) 3 hydrolysis resulting in precipitates and the development of a protective layer.…”

“…Nam et al showed that cerium 2-hydroxy-cinnamate performs better than cerium 4-hydroxycinnamate, inhibiting the corrosion of steel in NaCl solution. It was hypothesized that the hydroxyl groups interact with the metal surface by hydrogen bonding, and in the case of the ortho substitution (2-OH-cin), the aromatic ring is shielded, preventing further interactions and forming a uniform film compared to the ortho substitution (4-OH), where a multilayered film with cracks was observed by scanning electron microscopy (SEM) analysis . In addition to lanthanum and cerium counterions for cinnamate compounds, other rare-earth elements have also been tested; e.g., praseodymium 4-hydroxycinnamate, Pr­(4OHCin) 3 , was reported to inhibit cathodic and anodic reactions simultaneously on mild steel immersed in saturated CO 2 saline solutions by forming a densely packed crystalline film .…”