Structured Thin Films Based on Synergistic Effects of MnTa2O6 Oxide and bis-Carboxy-phenyl-substituted Porphyrins, Capable to Inhibit Steel Corrosion

Covering steel surfaces with suitable materials with the capacity to protect against corrosion represents a challenge for both research and industry, as steel, due to its paramount utility, is the most recycled material. This study presents the realization of new sandwich type materials based on 5,1...

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Autores principales:	Mihaela Birdeanu, Camelia Epuran, Ion Fratilescu, Eugenia Fagadar-Cosma
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	porphyrins oxide corrosion inhibition SEM AFM potentiodynamic polarization technique Chemical technology TP1-1185 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/aae85ce529834662b20a3dd3cbf223fe
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spelling	oai:doaj.org-article:aae85ce529834662b20a3dd3cbf223fe2021-11-25T18:50:08ZStructured Thin Films Based on Synergistic Effects of MnTa<sub>2</sub>O<sub>6</sub> Oxide and <i>bis</i>-Carboxy-phenyl-substituted Porphyrins, Capable to Inhibit Steel Corrosion10.3390/pr91118902227-9717https://doaj.org/article/aae85ce529834662b20a3dd3cbf223fe2021-10-01T00:00:00Zhttps://www.mdpi.com/2227-9717/9/11/1890https://doaj.org/toc/2227-9717Covering steel surfaces with suitable materials with the capacity to protect against corrosion represents a challenge for both research and industry, as steel, due to its paramount utility, is the most recycled material. This study presents the realization of new sandwich type materials based on 5,10-(4-carboxy-phenyl)-15,20-(4-phenoxy-phenyl)-porphyrin or 5,15-(4-carboxy-phenyl)-10,20-diphenylporphyrin and MnTa<sub>2</sub>O<sub>6</sub> designed to improve corrosion inhibition of steel in aggressive media. The thin films, designed as single- or sandwich-type structures were obtained on carbon steel through the drop-casting technique. Morphological investigations of thin films were carried out by field emission-scanning electron microscopy (SEM) and atomic force microscopy (AFM). The inhibition of a steel corrosion process was evaluated in an aggressive environment of 0.1 M HCl by performing electrochemical investigations such as open circuit potential (OCP) and the potentiodynamic polarization technique. The influence of variations in the cathodic Tafel slopes β<sub>c</sub> and anodic Tafel slopes β<sub>a</sub> over the corrosion rates was discussed. The best corrosion inhibition efficiency of 91.76% was realized by the steel electrode covered with sandwich-type layers of 5,15-(4-carboxy-phenyl)-10,20-diphenylporphyrin on the bottom layer and MnTa<sub>2</sub>O<sub>6</sub> on the top. The effect of location of the COOH groups in the <i>cis</i> or <i>trans</i> position on the tetrapyrrolic ring was also discussed to understand the corrosion inhibition mechanism.Mihaela BirdeanuCamelia EpuranIon FratilescuEugenia Fagadar-CosmaMDPI AGarticleporphyrinsoxidecorrosion inhibitionSEMAFMpotentiodynamic polarization techniqueChemical technologyTP1-1185ChemistryQD1-999ENProcesses, Vol 9, Iss 1890, p 1890 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	porphyrins oxide corrosion inhibition SEM AFM potentiodynamic polarization technique Chemical technology TP1-1185 Chemistry QD1-999
spellingShingle	porphyrins oxide corrosion inhibition SEM AFM potentiodynamic polarization technique Chemical technology TP1-1185 Chemistry QD1-999 Mihaela Birdeanu Camelia Epuran Ion Fratilescu Eugenia Fagadar-Cosma Structured Thin Films Based on Synergistic Effects of MnTa<sub>2</sub>O<sub>6</sub> Oxide and <i>bis</i>-Carboxy-phenyl-substituted Porphyrins, Capable to Inhibit Steel Corrosion
description	Covering steel surfaces with suitable materials with the capacity to protect against corrosion represents a challenge for both research and industry, as steel, due to its paramount utility, is the most recycled material. This study presents the realization of new sandwich type materials based on 5,10-(4-carboxy-phenyl)-15,20-(4-phenoxy-phenyl)-porphyrin or 5,15-(4-carboxy-phenyl)-10,20-diphenylporphyrin and MnTa<sub>2</sub>O<sub>6</sub> designed to improve corrosion inhibition of steel in aggressive media. The thin films, designed as single- or sandwich-type structures were obtained on carbon steel through the drop-casting technique. Morphological investigations of thin films were carried out by field emission-scanning electron microscopy (SEM) and atomic force microscopy (AFM). The inhibition of a steel corrosion process was evaluated in an aggressive environment of 0.1 M HCl by performing electrochemical investigations such as open circuit potential (OCP) and the potentiodynamic polarization technique. The influence of variations in the cathodic Tafel slopes β<sub>c</sub> and anodic Tafel slopes β<sub>a</sub> over the corrosion rates was discussed. The best corrosion inhibition efficiency of 91.76% was realized by the steel electrode covered with sandwich-type layers of 5,15-(4-carboxy-phenyl)-10,20-diphenylporphyrin on the bottom layer and MnTa<sub>2</sub>O<sub>6</sub> on the top. The effect of location of the COOH groups in the <i>cis</i> or <i>trans</i> position on the tetrapyrrolic ring was also discussed to understand the corrosion inhibition mechanism.
format	article
author	Mihaela Birdeanu Camelia Epuran Ion Fratilescu Eugenia Fagadar-Cosma
author_facet	Mihaela Birdeanu Camelia Epuran Ion Fratilescu Eugenia Fagadar-Cosma
author_sort	Mihaela Birdeanu
title	Structured Thin Films Based on Synergistic Effects of MnTa<sub>2</sub>O<sub>6</sub> Oxide and <i>bis</i>-Carboxy-phenyl-substituted Porphyrins, Capable to Inhibit Steel Corrosion
title_short	Structured Thin Films Based on Synergistic Effects of MnTa<sub>2</sub>O<sub>6</sub> Oxide and <i>bis</i>-Carboxy-phenyl-substituted Porphyrins, Capable to Inhibit Steel Corrosion
title_full	Structured Thin Films Based on Synergistic Effects of MnTa<sub>2</sub>O<sub>6</sub> Oxide and <i>bis</i>-Carboxy-phenyl-substituted Porphyrins, Capable to Inhibit Steel Corrosion
title_fullStr	Structured Thin Films Based on Synergistic Effects of MnTa<sub>2</sub>O<sub>6</sub> Oxide and <i>bis</i>-Carboxy-phenyl-substituted Porphyrins, Capable to Inhibit Steel Corrosion
title_full_unstemmed	Structured Thin Films Based on Synergistic Effects of MnTa<sub>2</sub>O<sub>6</sub> Oxide and <i>bis</i>-Carboxy-phenyl-substituted Porphyrins, Capable to Inhibit Steel Corrosion
title_sort	structured thin films based on synergistic effects of mnta<sub>2</sub>o<sub>6</sub> oxide and <i>bis</i>-carboxy-phenyl-substituted porphyrins, capable to inhibit steel corrosion
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/aae85ce529834662b20a3dd3cbf223fe
work_keys_str_mv	AT mihaelabirdeanu structuredthinfilmsbasedonsynergisticeffectsofmntasub2subosub6suboxideandibisicarboxyphenylsubstitutedporphyrinscapabletoinhibitsteelcorrosion AT cameliaepuran structuredthinfilmsbasedonsynergisticeffectsofmntasub2subosub6suboxideandibisicarboxyphenylsubstitutedporphyrinscapabletoinhibitsteelcorrosion AT ionfratilescu structuredthinfilmsbasedonsynergisticeffectsofmntasub2subosub6suboxideandibisicarboxyphenylsubstitutedporphyrinscapabletoinhibitsteelcorrosion AT eugeniafagadarcosma structuredthinfilmsbasedonsynergisticeffectsofmntasub2subosub6suboxideandibisicarboxyphenylsubstitutedporphyrinscapabletoinhibitsteelcorrosion
_version_	1718410667693703168

Structured Thin Films Based on Synergistic Effects of MnTa<sub>2</sub>O<sub>6</sub> Oxide and <i>bis</i>-Carboxy-phenyl-substituted Porphyrins, Capable to Inhibit Steel Corrosion

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