EFFECT OF THE MONOMERS RATIO IN THE ELECTROSYNTHESIS OF POLY(ANILINE- CO - O -METHOXYANILINE) ON STEEL CORROSION PROTECTION

ABSTRACT In this work, the synthesis of poly(aniline- co - o -methoxyaniline) was carried out on AISI 304 steel, by voltammetric or potentiostatic method. Electropolymerization was achieved from different ratios of 0.4 mol·L−1 aniline/ o -methoxyaniline monomers in 1.0 mol·L−1 H2...

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Autores principales:	del Valle,M. A., Mieres,F., Motheo,A., Ramírez,A. M. R.
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2020
Materias:	AISI-304 steel conducting polymer corrosion poly(aniline) poly(aniline- co - o -methoxyaniline) poly( o -methoxyaniline)
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072020000404998
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spelling	oai:scielo:S0717-970720200004049982020-12-03EFFECT OF THE MONOMERS RATIO IN THE ELECTROSYNTHESIS OF POLY(ANILINE- CO - O -METHOXYANILINE) ON STEEL CORROSION PROTECTIONdel Valle,M. A.Mieres,F.Motheo,A.Ramírez,A. M. R. AISI-304 steel conducting polymer corrosion poly(aniline) poly(aniline- co - o -methoxyaniline) poly( o -methoxyaniline) ABSTRACT In this work, the synthesis of poly(aniline- co - o -methoxyaniline) was carried out on AISI 304 steel, by voltammetric or potentiostatic method. Electropolymerization was achieved from different ratios of 0.4 mol·L−1 aniline/ o -methoxyaniline monomers in 1.0 mol·L−1 H2SO4. Homo- and copolymers were characterized by cyclic voltammetry, infrared spectroscopy, and scanning electron microscopy. Furthermore, the electrodeposits were studied with a view to their use as corrosion protectors, for which their polarization curve was measured in NaCl 3% and, after 168 h, the surface of the steel was also evaluated by optical microscopy. It was observed that the reactivity that the o -methoxy group gives to the aniline ring reduces the protection against corrosion due to the excessive inclusion of N-phenyl-1,4-benzo quinone-di-imine oligomers and/or with an oxazine structure. On the other hand, the optical images confirm the surface damage of the steel, correlating with SEM images that show morphological changes associated with the progress of synthesis and the o -methoxy group. Nevertheless, under optimal conditions, poly(aniline- co - o -methoxyaniline) modifies the corrosion potential of AISI 304 steel, displacing it by 0.283 V. Furthermore, the presence of small pits and the absence of surface oxide was observed, indicating a significant delay in the oxidation of AISI-304 steel.info:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.65 n.4 20202020-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072020000404998en10.4067/S0717-97072020000404998
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	AISI-304 steel conducting polymer corrosion poly(aniline) poly(aniline- co - o -methoxyaniline) poly( o -methoxyaniline)
spellingShingle	AISI-304 steel conducting polymer corrosion poly(aniline) poly(aniline- co - o -methoxyaniline) poly( o -methoxyaniline) del Valle,M. A. Mieres,F. Motheo,A. Ramírez,A. M. R. EFFECT OF THE MONOMERS RATIO IN THE ELECTROSYNTHESIS OF POLY(ANILINE- CO - O -METHOXYANILINE) ON STEEL CORROSION PROTECTION
description	ABSTRACT In this work, the synthesis of poly(aniline- co - o -methoxyaniline) was carried out on AISI 304 steel, by voltammetric or potentiostatic method. Electropolymerization was achieved from different ratios of 0.4 mol·L−1 aniline/ o -methoxyaniline monomers in 1.0 mol·L−1 H2SO4. Homo- and copolymers were characterized by cyclic voltammetry, infrared spectroscopy, and scanning electron microscopy. Furthermore, the electrodeposits were studied with a view to their use as corrosion protectors, for which their polarization curve was measured in NaCl 3% and, after 168 h, the surface of the steel was also evaluated by optical microscopy. It was observed that the reactivity that the o -methoxy group gives to the aniline ring reduces the protection against corrosion due to the excessive inclusion of N-phenyl-1,4-benzo quinone-di-imine oligomers and/or with an oxazine structure. On the other hand, the optical images confirm the surface damage of the steel, correlating with SEM images that show morphological changes associated with the progress of synthesis and the o -methoxy group. Nevertheless, under optimal conditions, poly(aniline- co - o -methoxyaniline) modifies the corrosion potential of AISI 304 steel, displacing it by 0.283 V. Furthermore, the presence of small pits and the absence of surface oxide was observed, indicating a significant delay in the oxidation of AISI-304 steel.
author	del Valle,M. A. Mieres,F. Motheo,A. Ramírez,A. M. R.
author_facet	del Valle,M. A. Mieres,F. Motheo,A. Ramírez,A. M. R.
author_sort	del Valle,M. A.
title	EFFECT OF THE MONOMERS RATIO IN THE ELECTROSYNTHESIS OF POLY(ANILINE- CO - O -METHOXYANILINE) ON STEEL CORROSION PROTECTION
title_short	EFFECT OF THE MONOMERS RATIO IN THE ELECTROSYNTHESIS OF POLY(ANILINE- CO - O -METHOXYANILINE) ON STEEL CORROSION PROTECTION
title_full	EFFECT OF THE MONOMERS RATIO IN THE ELECTROSYNTHESIS OF POLY(ANILINE- CO - O -METHOXYANILINE) ON STEEL CORROSION PROTECTION
title_fullStr	EFFECT OF THE MONOMERS RATIO IN THE ELECTROSYNTHESIS OF POLY(ANILINE- CO - O -METHOXYANILINE) ON STEEL CORROSION PROTECTION
title_full_unstemmed	EFFECT OF THE MONOMERS RATIO IN THE ELECTROSYNTHESIS OF POLY(ANILINE- CO - O -METHOXYANILINE) ON STEEL CORROSION PROTECTION
title_sort	effect of the monomers ratio in the electrosynthesis of poly(aniline- co - o -methoxyaniline) on steel corrosion protection
publisher	Sociedad Chilena de Química
publishDate	2020
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072020000404998
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EFFECT OF THE MONOMERS RATIO IN THE ELECTROSYNTHESIS OF POLY(ANILINE- CO - O -METHOXYANILINE) ON STEEL CORROSION PROTECTION

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