Corrosion of the Welded Aluminium Alloy in 0.5 M NaCl Solution. Part 2: Coating Protection

The high electrochemical activity of the aircraft 1579 aluminium alloy with a welded joint and the necessity of the coating formation to protect this material against corrosion as well as to increase the stability of the weld interface in the corrosive medium has been previously established. In this...

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Autores principales: Gnedenkov, Andrey S., Sinebryukhov, Sergey L., Mashtalyar, Dmitry V., Vyaliy, Igor E., Egorkin, Vladimir S., Gnedenkov, Sergey V.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6265944/
https://www.ncbi.nlm.nih.gov/pubmed/30400286
http://dx.doi.org/10.3390/ma11112177
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author Gnedenkov, Andrey S.
Sinebryukhov, Sergey L.
Mashtalyar, Dmitry V.
Vyaliy, Igor E.
Egorkin, Vladimir S.
Gnedenkov, Sergey V.
author_facet Gnedenkov, Andrey S.
Sinebryukhov, Sergey L.
Mashtalyar, Dmitry V.
Vyaliy, Igor E.
Egorkin, Vladimir S.
Gnedenkov, Sergey V.
author_sort Gnedenkov, Andrey S.
collection PubMed
description The high electrochemical activity of the aircraft 1579 aluminium alloy with a welded joint and the necessity of the coating formation to protect this material against corrosion as well as to increase the stability of the weld interface in the corrosive medium has been previously established. In this work, two suggested methods of protective coating formation based on plasma electrolytic oxidation (PEO) in tartrate-fluoride electrolyte significantly increased the protective properties of the welded joint area of the 1579 Al alloy. The electrochemical properties of the formed surface layers have been investigated using SVET (scanning vibrating electrode technique) and SIET (scanning ion-selective electrode technique), EIS (electrochemical impedance spectroscopy), OCP (open circuit potential), and PDP (potentiodynamic polarization) in 0.5 M NaCl. The less expressed character of the local electrochemical processes on the welded 1579 Al alloy with the composite coating in comparison with the base PEO-layer has been established. Polymer-containing coatings obtained using superdispersed polytetrafluoroethylene (SPTFE) treatment are characterized by the best possible protective properties and prevent the material from corrosion destruction. Single SPTFE treatment enables one to increase PEO-layer protection by 5.5 times. The results of this study indicate that SVET and SIET are promising to characterize and to compare corrosion behaviour of coated and uncoated samples with a welded joint in chloride-containing media.
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spelling pubmed-62659442018-12-17 Corrosion of the Welded Aluminium Alloy in 0.5 M NaCl Solution. Part 2: Coating Protection Gnedenkov, Andrey S. Sinebryukhov, Sergey L. Mashtalyar, Dmitry V. Vyaliy, Igor E. Egorkin, Vladimir S. Gnedenkov, Sergey V. Materials (Basel) Article The high electrochemical activity of the aircraft 1579 aluminium alloy with a welded joint and the necessity of the coating formation to protect this material against corrosion as well as to increase the stability of the weld interface in the corrosive medium has been previously established. In this work, two suggested methods of protective coating formation based on plasma electrolytic oxidation (PEO) in tartrate-fluoride electrolyte significantly increased the protective properties of the welded joint area of the 1579 Al alloy. The electrochemical properties of the formed surface layers have been investigated using SVET (scanning vibrating electrode technique) and SIET (scanning ion-selective electrode technique), EIS (electrochemical impedance spectroscopy), OCP (open circuit potential), and PDP (potentiodynamic polarization) in 0.5 M NaCl. The less expressed character of the local electrochemical processes on the welded 1579 Al alloy with the composite coating in comparison with the base PEO-layer has been established. Polymer-containing coatings obtained using superdispersed polytetrafluoroethylene (SPTFE) treatment are characterized by the best possible protective properties and prevent the material from corrosion destruction. Single SPTFE treatment enables one to increase PEO-layer protection by 5.5 times. The results of this study indicate that SVET and SIET are promising to characterize and to compare corrosion behaviour of coated and uncoated samples with a welded joint in chloride-containing media. MDPI 2018-11-03 /pmc/articles/PMC6265944/ /pubmed/30400286 http://dx.doi.org/10.3390/ma11112177 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Gnedenkov, Andrey S.
Sinebryukhov, Sergey L.
Mashtalyar, Dmitry V.
Vyaliy, Igor E.
Egorkin, Vladimir S.
Gnedenkov, Sergey V.
Corrosion of the Welded Aluminium Alloy in 0.5 M NaCl Solution. Part 2: Coating Protection
title Corrosion of the Welded Aluminium Alloy in 0.5 M NaCl Solution. Part 2: Coating Protection
title_full Corrosion of the Welded Aluminium Alloy in 0.5 M NaCl Solution. Part 2: Coating Protection
title_fullStr Corrosion of the Welded Aluminium Alloy in 0.5 M NaCl Solution. Part 2: Coating Protection
title_full_unstemmed Corrosion of the Welded Aluminium Alloy in 0.5 M NaCl Solution. Part 2: Coating Protection
title_short Corrosion of the Welded Aluminium Alloy in 0.5 M NaCl Solution. Part 2: Coating Protection
title_sort corrosion of the welded aluminium alloy in 0.5 m nacl solution. part 2: coating protection
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6265944/
https://www.ncbi.nlm.nih.gov/pubmed/30400286
http://dx.doi.org/10.3390/ma11112177
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