Modified bis-(3-(3-(3-triethoxysilyl)propyl)thioureido)propyl terminated poly(dimethylsiloxane)/POSS protective coatings on AA 2024

[Display omitted] •Novel bis end-capped ethoxysilylpropyl-thioureido-fuctionalised PDMS precursor was synthesised.•Addition of trisilanol-heptaisooctyl-POSS increased protective efficiency.•Extensive IR spectroscopy confirmed hydrolysis and condensation processes.•Raman imaging enabled the determina...

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Bibliographic Details
Published in:Progress in organic coatings 2017-02, Vol.103, p.1-14
Main Authors: Surca, Angelja K., Rauter, Aleksander, Rodošek, Mirjana, Slemenik Perše, Lidija, Koželj, Matjaž, Orel, Boris
Format: Article
Language:English
Subjects:
AA 2024
Aluminum alloys
Aluminum base alloys
Behavior
Chemical compounds
Coatings
Corrosion
Crosslinking
Experiments
Immersion
IR spectroscopy
Molecules
Organic coatings
Poly(dimethylsiloxane)
Polydimethylsiloxane
Pretreatment
Protective coatings
Raman spectroscopy
Rheology
Silanes
Sol-gel
Stability
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Summary:[Display omitted] •Novel bis end-capped ethoxysilylpropyl-thioureido-fuctionalised PDMS precursor was synthesised.•Addition of trisilanol-heptaisooctyl-POSS increased protective efficiency.•Extensive IR spectroscopy confirmed hydrolysis and condensation processes.•Raman imaging enabled the determination of homogeneity of coatings.•In situ Raman spectroelectrochemical measurement was applied. The aim of this work was to investigate the protective behaviour of bis-(3-(3-(3-triethoxysilyl)propyl)thioureido)propyl terminated polydimethylsiloxane (PDMSTU) pre-treatment coatings on the AA 2024 aluminium alloy. The silane solution was modified by the addition of bis-([3-(triethoxysilyl)propyl]tetrasulphide) (BTESPT) and trisilanol-heptaisooctyl-POSS (TS-iOc7-POSS) in order to introduce better crosslinking and improved mechanical and electrochemical stability in the silane primer coating. The corrosion behaviour of the protected AA 2024 alloy was studied during immersion in 0.5M NaCl solution, using potentiodynamic polarisation measurements and eventual structural changes were followed using in situ Raman spectroelectrochemical technique. The electrochemical experiments showed that the presence of BTESPT and TS-iOc7-POSS molecules improves the protective behaviour of the silane coating, while Raman imaging was used to determine their distribution in coatings.
ISSN:0300-9440
1873-331X
DOI:10.1016/j.porgcoat.2016.11.023