Electrodeposition of polypyrrole on Nitinol alloy in the presence of inhibitor ions for corrosion protection

Flamini, Daniel Omar; Saugo, Melisa; Saidman, S.B.

doi:10.1016/j.corsci.2013.11.063

Cited by 32 publications

(15 citation statements)

References 48 publications

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“…PEDOT works as the electron exchange medium to passivate the SS underneath and reduce the oxygen on the surface. The corrosion performances of different mole ratios of synthesized poly{(N-methacryloyloxymethyl)benzotriazoleco-N-vinylpyrrolidone} coated on low nickel stainless steel specimens has been investigated in 1 M H 2 SO 4 using potentiodynamic polarization, electrochemical impedance method, and chronoamperometric studies [79]. Surface and morphological investigation were also carried out to characterize the adherence and uniformity of the coatings.…”

Section: Synthetic Polymers As Corrosion Inhibitors Of Stainless Steelmentioning

confidence: 99%

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

Umoren

Solomon²

2014

TOMSJ

114

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Abstract:The use of corrosion inhibitors is the one the most economical and practical means of controlling metallic corrosion in different corrosive media. Interest on the use of eco-friendly organic compounds as corrosion inhibitors has extended to the use of polymers to inhibit metallic corrosion. The use of polymers as corrosion inhibitors has attracted attention and has gained wide acceptance in recent times. This has been attributed to a number of factors namely: (i) they are low cost and stable to metallic materials in acid media, (ii) they possess multiple adsorption sites, (iii) through their functional groups, they form complexes with metal ions and on the metal surface these complexes occupy a large area, thereby blanketing the surface and protecting the metal from corrosive agents present in the solution. A number of synthetic and natural polymers as metallic corrosion inhibitors have been investigated and reported. As an update to previous review work on the use of polymers as corrosion inhibitors, the present review presents most of the contributions made to the literature on the use of polymers as corrosion inhibitors of diverse metals in different corrosive media in the last four (2010)(2011)(2012)(2013) years.

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Section: Synthetic Polymers As Corrosion Inhibitors Of Stainless Steelmentioning

confidence: 99%

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

Umoren

Solomon²

2014

TOMSJ

114

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“…Como se puede ver, PPy 1 presenta una adherencia 10 veces mayor que la película formada a pH neutro. Se han reportado valores de fuerza de adherencia de hasta 1,54 MPa para PPy formado a partir de soluciones orgánicas [16] y de hasta 2,07 MPa [17] para PPy dopado con inhibidores de la corrosión. Se puede concluir que la muestra PPy 1 presenta buena adherencia.…”

Section: Caracterización De Las Películas De Ppyunclassified

Formación electroquímica de películas de polipirrol sobre Nitinol a partir de soluciones de ácido sulfosuccínico

2018

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RESUMENEn este trabajo se estudió la electrosíntesis de polipirrol (PPy) sobre Nitinol a partir de soluciones de ácido sulfosuccínico (0,25 M) y pirrol (0,25 M). El PPy fue formado potenciostáticamente en soluciones de pH 1 y 7. Hasta donde tenemos conocimiento, es la primera vez que se realiza la electrodeposición de PPy en presencia de ácido sulfosuccinico.La morfología de las películas se estudió mediante imágenes de microscopia de barrido electrónico, observándose la típica forma globular del PPy. También se determinó, mediante energía dispersiva de rayos X (EDS), la presencia de S lo cual confirma que el dopante fue incorporado a la matriz polimérica. Las pelícu-las formadas son muy adherentes y presentan una conductividad aceptable.Para poder evaluar el comportamiento ante la corrosión se realizaron diferentes experiencias electroquímicas en solución de Ringer: medición del potencial de circuito abierto, diagramas de Tafel y voltametría de barrido lineal. Si bien ambos recubrimientos mejoran la protección del sustrato, las películas formadas en solución de pH 1 ofrecen mejores resultados. El análisis de iones en solución mediante espectrometría de emisión atómica de plasma acoplado inductivo confirma que las películas son protectoras, evitando la liberación de iones Ni en la solución.Palabras clave: Nitinol, Polipirrol, Acido Sulfosuccínico, Adherencia. ABSTRACTIn this work the electrosynthesis of polypyrrole (PPy) on Nitinol from solutions of sulfosuccinic acid (0,25 M) and pyrrole (0,25 M) was studied. The PPy was formed potentiostatically in solutions of pH 1 and 7. As far as we know, this is the first time that the electrodeposition of PPy is carried out in the presence of sulfosuccinic acid.The morphology of the films was studied by scanning electron microscopy images, observing the typical globular shape of PPy. The presence of S was also determined by X-ray dispersive energy (EDX), confirming that the dopant was incorporated into the polymer matrix. The films formed are very adherent and exhibit acceptable conductivity.In order to evaluate the corrosion behaviour, different electrochemical experiments were performed in Ringer's solution: measurement of open circuit potential, Tafel plots and linear sweep voltammetry. While both coatings improve the protection of the substrate, the films formed in pH 1 solution offer better results. The analysis of ions in solution by inductive coupled plasma atomic emission spectrometry confirms that the films are protective, preventing the release of Ni ions into the solution.

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“…In this respect, Jamesh et al [40] observed apatite deposition on the Ti after surface mechanical attrition treatment and immersion in simulated body fluids due to the formation of nano-structured grains in the near surface, higher surface roughness, surface wettability, and higher surface energy. Flamini et al [41] demonstrated that a polypyrrole film containing molybdate ions prepared by electrodeposition enhanced the corrosion resistance of NiTi in 0.15 M NaCl and Manhabosco et al [42] observed that a diamond-like carbon film prepared improved the corrosion resistance of Ti in the phosphate buffer saline solution. All in all, although TiO 2 , TiN x O y , bone-like apatite, polypyrrole, and DLC films prepared by various techniques have been shown to improve the corrosion resistance of Ti and its alloys, it is still necessary to optimize all the related properties including adhesion, biocompatibility, corrosion resistance, and covalent binding of protein molecules for biomedical applications.…”

Section: Introductionmentioning

confidence: 98%