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Acrylate-based hybrid sol-gel coating for corrosion protection of AA7075-T6 in aircraft applications : the effect of copolymerization time
ID Rodič, Peter (Author), ID Cerc Korošec, Romana (Author), ID Kapun, Barbara (Author), ID Mertelj, Alenka (Author), ID Milošev, Ingrid (Author)

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Abstract
Pre-hydrolysed/condensed tetraethyl orthosilicate (TEOS) was added to a solution of methyl methacrylate (MMA) and 3-methacryloxypropyltrimethoxysilane (MAPTMS), and then copolymerised for various times to study the influence of the latter on the structure of hybrid sol-gel coatings as corrosion protection of aluminium alloy 7075-T6. The reactions taking place during preparation were characterised using real-time Fourier transform infrared spectroscopy, dynamic light scattering and gel permeation chromatography. The solution characteristics were evaluated, using viscosimetry, followed by measurements of thermal stability determined by thermogravimetric analysis. The optimal temperature for the condensation reaction was determined with the help of high-pressure differential scanning calorimetry. Once deposited on 7075-T6 substrates, the coatings were evaluated using a field emission scanning electron microscope coupled to an energy dispersive spectrometer to determine surface morphology, topography, composition and coating thickness. Corrosion properties were tested in dilute Harrison’s solution (3.5 g/L (NH$_4$)$_2$SO$_4$ and 0.5 g/L NaCl) using electrochemical impedance spectroscopy. The copolymerization of MMA and MAPTMS over 4 h was optimal for obtaining 1.4 µm thick coating with superior barrier protection against corrosion attack (|Z$_{10}$ $_{mHz}$| ~ 1 GΩ cm$^2$) during three months of exposure to the corrosive medium.

Language:English
Keywords:AA7075-T6, hybrid sol-gel, copolymerization, corrosion, dilute Harrison’s solution
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FKKT - Faculty of Chemistry and Chemical Technology
Publication status:Published
Publication version:Version of Record
Year:2020
Number of pages:26 str.
Numbering:Vol. 12, iss. 4, art. 948
PID:20.500.12556/RUL-133729 This link opens in a new window
UDC:620.1/.2
ISSN on article:2073-4360
DOI:10.3390/polym12040948 This link opens in a new window
COBISS.SI-ID:33305639 This link opens in a new window
Publication date in RUL:13.12.2021
Views:953
Downloads:200
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Record is a part of a journal

Title:Polymers
Shortened title:Polymers
Publisher:MDPI
ISSN:2073-4360
COBISS.SI-ID:517951257 This link opens in a new window

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:19.04.2020

Projects

Funder:ARRS - Slovenian Research Agency
Project number:P2-0393
Name:Napredni materiali za nizkoogljično in trajnostno družbo

Funder:ARRS - Slovenian Research Agency
Project number:P1-0134
Name:Kemija za trajnostni razvoj

Funder:ARRS - Slovenian Research Agency
Project number:P1-0192
Name:Svetloba in snov

Funder:EC - European Commission
Funding programme:H2020
Project number:685451
Name:ERA-NET for materials research and innovation
Acronym:M-ERA.NET 2

Funder:EC - European Commission
Funding programme:M-ERA.NET 2
Name:Design of corrosion resistant coatings targeted for versatile applications
Acronym:COR_ID

Funder:EC - European Commission
Funding programme:H2020
Project number:777441
Name:Pan-European Access for man. SME on tech. services for clean production through a Network of premier KET Technology Centres with one stop shop access incl. EEN and discourse with policy makers on RIS3
Acronym:KET4CleanProduction

Funder:EC - European Commission
Funding programme:Key enabling technologies to solve clean production (KET4CleanProduction)
Name:Developing isocyanate-free polyurethane-based coatings for corrosion protection

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