Testing protective coatings for metal conservation: the influence of the application method

The lack of a standardised methodology for the application of coatings on heritage metals can lead to non-comparable results. A careful and meaningful study requires considering the different application variables involved, especially in the preparation of the coupons. In this work, the effect that...

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Autores: Molina Delgado, M. Teresa, Cano Díaz, Emilio, Ramírez Barat, Blanca
Tipo de recurso: artículo
Fecha de publicación:2023
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/350405
Acceso en línea:http://hdl.handle.net/10261/350405
Access Level:acceso abierto
Palabra clave:Coatings
Application methodology
Metallic heritage
Drying time
Thickness
Number of layers
Accelerated ageing
Dewetting
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spelling Testing protective coatings for metal conservation: the influence of the application methodMolina Delgado, M. TeresaCano Díaz, EmilioRamírez Barat, BlancaCoatingsApplication methodologyMetallic heritageDrying timeThicknessNumber of layersAccelerated ageingDewettingThe lack of a standardised methodology for the application of coatings on heritage metals can lead to non-comparable results. A careful and meaningful study requires considering the different application variables involved, especially in the preparation of the coupons. In this work, the effect that these application variables can have on the protective capacity of the coatings used has been studied. The influence of the thickness, number of layers and drying time (between layers and final) of Paraloid B-72, C80 microcrystalline wax and Incralac has been evaluated. Coatings have been applied on bare steel coupons, thickness measured with an induction probe, and subject to artificial ageing on UV light/water condensation cycles. The performance of the coatings has been studied by visual inspection and electrochemical impedance spectroscopy (EIS). Morphology of the layers has been characterised by optical microscopy and the composition of the corrosion products by Raman spectroscopy. Results show that the number of layers is not always proportional to the final thickness of the coating, and that drying time is a critical factor affecting the thickness and the protective properties of the coatings. After accelerated ageing, some coatings that had been left to dry for 14 days have a much better protective capacity than those that were left to dry for less time. Without taking into account these factors, performance measured can be wrong and comparison between materials misleading.Open Access funding provided thanks to the CRUE-CSIC agree‑ment with Springer Nature. This work has been funded by MCIN/AEI/10.13039/501100011033 and “ERDF A way of making Europe”, under the project COMPACT (HAR2017-89911-R) and the predoctoral grant PRE2018086667 additionally funded by “ESF Investing in your future”. It is also been funded by the Community of Madrid and the European Social Fund, under the TOP Heritage-CM programme (P2018/NMT-4372).Peer reviewedSpringerMinisterio de Ciencia e Innovación (España)Comunidad de MadridConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2024202420232024info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/350405reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/HAR2017-89911-RP2018/NMT-4372https://doi.org/10.1186/s40494-023-00937-0Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3504052026-05-22T06:33:51Z
dc.title.none.fl_str_mv Testing protective coatings for metal conservation: the influence of the application method
title Testing protective coatings for metal conservation: the influence of the application method
spellingShingle Testing protective coatings for metal conservation: the influence of the application method
Molina Delgado, M. Teresa
Coatings
Application methodology
Metallic heritage
Drying time
Thickness
Number of layers
Accelerated ageing
Dewetting
title_short Testing protective coatings for metal conservation: the influence of the application method
title_full Testing protective coatings for metal conservation: the influence of the application method
title_fullStr Testing protective coatings for metal conservation: the influence of the application method
title_full_unstemmed Testing protective coatings for metal conservation: the influence of the application method
title_sort Testing protective coatings for metal conservation: the influence of the application method
dc.creator.none.fl_str_mv Molina Delgado, M. Teresa
Cano Díaz, Emilio
Ramírez Barat, Blanca
author Molina Delgado, M. Teresa
author_facet Molina Delgado, M. Teresa
Cano Díaz, Emilio
Ramírez Barat, Blanca
author_role author
author2 Cano Díaz, Emilio
Ramírez Barat, Blanca
author2_role author
author
dc.contributor.none.fl_str_mv Ministerio de Ciencia e Innovación (España)
Comunidad de Madrid
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Coatings
Application methodology
Metallic heritage
Drying time
Thickness
Number of layers
Accelerated ageing
Dewetting
topic Coatings
Application methodology
Metallic heritage
Drying time
Thickness
Number of layers
Accelerated ageing
Dewetting
description The lack of a standardised methodology for the application of coatings on heritage metals can lead to non-comparable results. A careful and meaningful study requires considering the different application variables involved, especially in the preparation of the coupons. In this work, the effect that these application variables can have on the protective capacity of the coatings used has been studied. The influence of the thickness, number of layers and drying time (between layers and final) of Paraloid B-72, C80 microcrystalline wax and Incralac has been evaluated. Coatings have been applied on bare steel coupons, thickness measured with an induction probe, and subject to artificial ageing on UV light/water condensation cycles. The performance of the coatings has been studied by visual inspection and electrochemical impedance spectroscopy (EIS). Morphology of the layers has been characterised by optical microscopy and the composition of the corrosion products by Raman spectroscopy. Results show that the number of layers is not always proportional to the final thickness of the coating, and that drying time is a critical factor affecting the thickness and the protective properties of the coatings. After accelerated ageing, some coatings that had been left to dry for 14 days have a much better protective capacity than those that were left to dry for less time. Without taking into account these factors, performance measured can be wrong and comparison between materials misleading.
publishDate 2023
dc.date.none.fl_str_mv 2023
2024
2024
2024
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/350405
url http://hdl.handle.net/10261/350405
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/HAR2017-89911-R
P2018/NMT-4372
https://doi.org/10.1186/s40494-023-00937-0
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Springer
publisher.none.fl_str_mv Springer
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
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