Cerium and Other Rare Earth Salts as Corrosion Inhibitors—A Review

Mendez, José Antonio Cabello; Vong, Yunny Meas; Bueno, José de Jesús Pérez

doi:10.1134/s2070205122040141

Cited by 17 publications

(9 citation statements)

References 80 publications

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“…The increase in the presence of this hydroxide is a first indication of the possible higher efficiency of the plasma method to deposit samarium species as corrosion inhibitors since the hydroxide of samarium is considered a corrosion inhibitor 65 and even a self-healing compound since its oxidation increases the volume and blocks the failures on the top physical barriers. In the case of the immersion method, the samarium hydroxide was not attained and in the APPJ method, the majority species is Sm(OH) 3,42 .…”

Section: Samarium Compound Layers By Appjmentioning

confidence: 99%

“…Samarium has been used in conversion coating 34,35 and alloys to improve corrosion prevention in aluminum 36,37 , magnesium 38,39 , and steel 40,41 . The principle of protection against corrosion using samarium as an inhibitor is based on the formation of oxides and hydroxides that are insoluble and block the cathodic sites, which slows down the corrosion rate 42 .The protective effect of coatings on aluminum cast alloys has been extensively investigated in the literature [43][44][45][46][47] . The Atmospheric Pressure Plasma Jet (APPJ) is a surface treatment focused on preventing and protecting against corrosion.…”

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confidence: 99%

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confidence: 99%

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Study of the anticorrosive behavior of samarium as a corrosion inhibitor in multilayer systems for aluminum alloy

Mendez

Rojas

Bueno

et al. 2023

Sci Rep

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This study shows a multilayer system based on samarium compounds as a corrosion inhibitor and a continuous SiO2 layer by atmospheric pressure plasma jet (APPJ) as a protective barrier for aluminim alloy AA3003. One of the main advantages of this new coating is that it does not require vacuum chambers, which makes it easy to incorporate into production lines for automotive and aeronautical components, etc. The deposit of samarium corrosion inhibitor was carried out by two methods for comparison, the immersion method and a novel method to deposit corrosion inhibitor by APPJ. The multilayer system generated was homogeneous, continuous, adherent, and dense. The electrochemical behavior shows that the samarium compound was completely oxidized on coatings by the immersion method and favors corrosion. The APPJ deposition method shows a protective behavior against corrosion by both samarium compounds and silica depositions. XPS analyses show that the amount of Sm(OH)3 increases by the APPJ method compared with the immersion method since the spectrum of O1s is mainly controlled by OH. It was determined that the best processing times for the electrochemical study of the multilayer system were 40 min for the immersion method and 30 s for the APPJ method for the layer of corrosion inhibitor. In the case of the SiO2 barrier layer by APPJ, the best time was 60 s of exposure to the plasma jet and this coating could reduce the corrosion of AA3003 by 31.42%.

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Section: Samarium Compound Layers By Appjmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Study of the anticorrosive behavior of samarium as a corrosion inhibitor in multilayer systems for aluminum alloy

Mendez

Rojas

Bueno

et al. 2023

Sci Rep

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“…[37] As already mentioned, Ce(III) is a recognized cathodic inhibitor. [38,39] The proposed inhibition mechanism consists of two steps. [10,14,40] First, highly insoluble Ce(III) oxides and hydroxides are formed due to the interaction between the Ce (III) ions and the hydroxyl ions generated at the cathodic active sites.…”

Section: Potentiodynamic Polarization Curvesmentioning

confidence: 99%

Cerium and aluminum molybdates as inhibitors of the aluminum AA1050 corrosion process in aqueous NaCl solutions

Byrne,

Quesada Cangahuala,

D'Alessandro

et al. 2023

Materials & Corrosion

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Cerium molybdate and aluminum molybdate were synthesized by precipitation at controlled pH. The inhibitory properties of these solids on the corrosion process of aluminum in near‐neutral aqueous NaCl solutions were studied. Potentiodynamic polarization curves showed that both molybdates act as mixed‐type inhibitors. This is due to molybdate anion acts as an anodic inhibitor, while the trivalent cations Ce(III) and Al(III) have an inhibitory effect on the cathodic reaction. Linear polarization tests demonstrated a large increase in polarization resistance when these solids are added, resulting in an inhibition efficiency of 97% in both cases. Scanning electron microscopy and X‐ray energy dispersive microanalysis of the exposed surfaces revealed the formation of compact protective films rich in Mo and with no detectable Cl levels.

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“…In order to inhibit localised corrosion, corrosion inhibitors should have the capacity to interact over various lengths and time scales to match those time-dependent processes occurring on alloy surfaces. Environmentally friendly rare earth (RE) compounds have demonstrated complex multiscale interactions when inhibiting corrosion reactions on aluminium alloys, for instance, AA2024-T3 [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Probing Localised Corrosion Inhibition of AA2024-T3 by Integrating Electrode Array, SVET, SECM, and SEM-EDS Techniques

Parvizi,

Hughes,

Forsyth

et al. 2023

Metals

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This work demonstrates an approach towards the understanding of multi-scale and open-circuit localised electrochemical processes of AA2024-T3 in the presence and absence of an environmentally friendly rare-earth inhibitor; cerium diphenyl phosphate (Ce(dpp)3). At high temporal resolution, a wire bean electrode (WBE) made from 100 identical AA2024-T3 wires revealed sudden increases in galvanic anodic and cathodic activities immediately after dosing of 50 and 100 ppm of the inhibitor and an overall suppression of macro-scale activities by increasing the inhibitor concentration to 200 ppm, suggesting it as a fast-screening tool for inhibitors and measuring inhibition efficiency. At high spatial resolutions, scanning probe electrochemical techniques confirmed local activation of corroding microstructures on individual AA2024-T3 wires similarly by dosing the inhibitor up to 100 ppm. In agreement with WBE findings, the effective shutdown of both anodic and cathodic activities occurred after increasing the inhibitor concentration to 200 ppm confirming the optimal concentration of the Ce(dpp)3 and the mixed mode inhibition mechanism of this selected inhibitor on AA2024-T3.

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Cerium and Other Rare Earth Salts as Corrosion Inhibitors—A Review

Cited by 17 publications

References 80 publications

Study of the anticorrosive behavior of samarium as a corrosion inhibitor in multilayer systems for aluminum alloy

Study of the anticorrosive behavior of samarium as a corrosion inhibitor in multilayer systems for aluminum alloy

Cerium and aluminum molybdates as inhibitors of the aluminum AA1050 corrosion process in aqueous NaCl solutions

Probing Localised Corrosion Inhibition of AA2024-T3 by Integrating Electrode Array, SVET, SECM, and SEM-EDS Techniques

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