Lanthanide salts as alternative corrosion inhibitors

Bernal, S.; Botana, Francisco; Calvino, José J.; Marcos, M.; Pérez-Omil, Jose A.; Vidal, Hilario

doi:10.1016/0925-8388(94)07135-7

Cited by 58 publications

(40 citation statements)

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“…However, in the case of cathodic current density, the greatest decrease occurred at concentrations up to 0.001 M Nd 3+ . Notwithstanding the beneficial effect of the rare earth chlorides on the corrosion inhibition process, their addition in high concentrations will cause a decrease in their inhibitory capacity due to the inherent increase of the chloride ions in the electrolyte [6].…”

Section: +mentioning

confidence: 99%

“…In all three cases, a decrease in the corrosion current density is observed; however, a displacement of the corrosion potential towards more active potentials characterizes a cathodic inhibitor and in the opposite case to an anodic type. When an inhibitor affects both processes (corrosion current density and corrosion potential), it is considered as a mixed inhibitor, and its net effect in the polarization curves will be determined by the inhibition magnitude of the anodic and cathodic reactions [6]. e previous analysis shows that the addition of Nd 3+ ions changed the corrosion process of the API X70 steel, affecting both the anodic and cathodic branches (different current densities); this suggests that both the local anodic dissolution and the cathodic reduction of oxygen are affected simultaneously [2,4].…”

Section: +mentioning

confidence: 99%

“…It has been recognized that rare earth salts are low-toxicity compounds whose average lethal dose (LD50) is similar to that of sodium chloride (NaCl) [1][2][3]; therefore, the interest in the use of rare earths has emerged as an alternative to replace those toxic and highly carcinogenic corrosion inhibitors that affect both people and the environment, and many of these dangerous inhibitors are based on chromates (CrO 2− 4 ), mercurate, nitrite, and alkynol [4]. Most of the studies have been reported based on the use of both Ce and La salts as corrosion inhibitors, in the form of either chlorides, nitrates, or other salts [2,[4][5][6][7][8][9]. Many of these studies have been carried out in chloride-rich solutions, and the excellent corrosion inhibiting capacity of rare earth salts has been attributed to the high reactivity of rare earths.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Nd³⁺ Ion Concentration on the Corrosion Resistance of API X70 Steel in Chloride‐Rich Environments

Escalera

Ramos-Hernández

Porcayo-Palafox

et al. 2018

Advances in Materials Science and Engineering

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In this study, the effect of the addition of Nd 3+ ions as a corrosion inhibitor of the API X70 steel in a medium rich in chlorides was evaluated. e performance of the Nd 3+ ions was evaluated by means of electrochemical techniques such as potentiodynamic polarization curves, open circuit potential measurements, linear polarization resistance, and electrochemical impedance spectroscopy, as well as by means of scanning electron microscopy and EDS measurements. e results showed that Nd 3+ ions reduce the corrosion rate of steel at concentrations as low as 0.001 M Nd 3+ . At higher concentrations, the inhibition efficiency was only slightly affected although the concentration of chloride ions was increased by the addition of the inhibitor. e adsorption of the Nd 3+ ions promotes the formation of a protective layer of oxides/hydroxides on the metal surface, thereby reducing the exchange rate of electrons. Nd 3+ ions act as a mixed inhibitor with a strong predominant cathodic effect.

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Section: +mentioning

confidence: 99%

Section: +mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Nd³⁺ Ion Concentration on the Corrosion Resistance of API X70 Steel in Chloride‐Rich Environments

Escalera

Ramos-Hernández

Porcayo-Palafox

et al. 2018

Advances in Materials Science and Engineering

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“…Asimismo, para generar capas libres de cromo se vienen estudiando métodos diversos como el anodizado sulfúrico, con el que se consigue depositar sobre el metal películas finas de elevada resistencia a la corrosión (6), la formación pirolítica de capas de óxido de estaño (7), el desarrollo de películas cerámicas por chispa anódica (8), la deposición de capas por el método sol-gel (9) o la incorporación de elementos lantánidos (10)(11)(12)(13)(14)(15)(16)(17)(18). En nuestros laboratorios se viene estudiando desde hace algunos años el comportamiento de sales lantánidas (19)(20)(21)(22)(23)(24) como inhibidores de la corrosión, dado el bajo nivel…”

Section: Introductionunclassified

Inhibidores de escaso impacto medioambiental. Sistemas basados en tierras raras

et al. 1997

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Resumen Se estudia el comportamiento de los cloruros de lantano, cerio y samario como inhibidores de los procesos de corrosión uniforme y por picaduras de los aceros inoxidables AISI 434 y AISI 304 y de la aleación de aluminio AA 5083 en disoluciones aireadas de NaCl al 3,5 %. Utilizando técnicas electroquímicas como polarización lineal y cíclica, se ha podido evaluar el poder inhibidor de estas sustancias. El mejor comportamiento inhibidor se ha obtenido para una concentración de 500 ppm de CeCl 3 , si bien para los aceros se obtienen resultados del mismo orden para 500 ppm de LaCl 3 . Con la ayuda de microscopía electrónica de barrido y espectroscopia de dispersión de energía se ha podido confirmar el carácter catódico del mecanismo de inhibición que tiene lugar en el proceso.Palabras clave: Tierras raras. Inhibidores ecológicos. Corrosión uniforme. Corrosión por picaduras. Agua de mar. Green inhibitors. Rare Earth based systemsAbstract Lanthanum, Cerium and Samarium chlorides have been investigated as uniform and pitting corrosión inhibitors of AISI 434 and AISI 304 stainless steels and AA 5083 Al-Mg alloy in 3.5 % NaCl aerated aqueous solutions. Their inhibitor power was evaluated by using electrochemical techniques such as Linear and Cyclic Polarisation. In each case, the highest protection degree was found in the solution dopped with 500 ppm of CeCl 3 . Similar results were obtained for additions of 500 ppm of LaCl 3 . Scanning Electron Microscopy and Energy Dispersive Spectroscopy allowed us to confirm the cathodic nature of the inhibition process.

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“…There are several inorganic salts that are less toxic than chromate inhibitors. Among the metals used for corrosion inhibitor are: mercury (Hg) [62], lanthanide salts (La) [63,64], samarium (Sm) [63], cerium salts [64][65][66][67][68] and platinum (Pt) [69] ( Table 1).…”

Section: Inorganic Green Inhibitorsmentioning

confidence: 99%

Green Methods for Corrosion Control

Emran¹,

Ali²,

lehaibi³

2018

Corrosion Inhibitors, Principles and Recent Applications

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Corrosion of metals is a serious environmental problem. Most of the corrosion inhibitors are synthetic chemicals that are hazardous to environments and expensive. Today, there has been an increasing search for green corrosion inhibitors, due to the toxicity of some inhibitors. Green corrosion inhibitors are biodegradable and free of heavy metals or other toxic compounds. There is an intensive effort underway to develop new plant origin corrosion inhibitors for metal subjected to various environmental conditions. Salts of rare earth elements can be also used as inorganic alternative nontoxic corrosion inhibitors. Sol-gel coatings can be recommended as green protective films for metal corrosion. The origin of sol-gel process, its advantages and limitations, and the type of coating method are presented in this chapter, as well as a brief summary of recent literature concerning the use of hybrid inorganic-organic sol-gel and nanostructured sol-gel protective coatings for metal corrosion in different media.

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Lanthanide salts as alternative corrosion inhibitors

Cited by 58 publications

References 5 publications

Effect of Nd³⁺ Ion Concentration on the Corrosion Resistance of API X70 Steel in Chloride‐Rich Environments

Effect of Nd³⁺ Ion Concentration on the Corrosion Resistance of API X70 Steel in Chloride‐Rich Environments

Inhibidores de escaso impacto medioambiental. Sistemas basados en tierras raras

Green Methods for Corrosion Control

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Lanthanide salts as alternative corrosion inhibitors

Cited by 58 publications

References 5 publications

Effect of Nd3+ Ion Concentration on the Corrosion Resistance of API X70 Steel in Chloride‐Rich Environments

Effect of Nd3+ Ion Concentration on the Corrosion Resistance of API X70 Steel in Chloride‐Rich Environments

Inhibidores de escaso impacto medioambiental. Sistemas basados en tierras raras

Green Methods for Corrosion Control

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Effect of Nd³⁺ Ion Concentration on the Corrosion Resistance of API X70 Steel in Chloride‐Rich Environments

Effect of Nd³⁺ Ion Concentration on the Corrosion Resistance of API X70 Steel in Chloride‐Rich Environments