Chitosan Microspheres as Carriers for pH-Indicating Species in Corrosion Sensing
authors Sousa, I; Quevedo, MC; Sushkova, A; Ferreira, MGS; Tedim, J
nationality International
journal MACROMOLECULAR MATERIALS AND ENGINEERING
author keywords chitosan microspheres; controlled release studies; corrosion studies; pH-sensing species
keywords CONTROLLED-RELEASE; DRUG-RELEASE; ENCAPSULATION; PROTECTION; COATINGS; MECHANISM
abstract Chitosan microspheres containing bromocresol green, cresol red, and phenolphthalein for corrosion detection, through pH change, are synthesized in order to be used in protective coatings for aluminium alloys. Microspheres containing corrosion detection species are characterized morphologically (SEM) and physico-chemically (FTIR, TGA). Release studies (UV-vis) are performed in corrosion-promoting conditions (pH, NaCl), and detection studies by immersion in media associated with corrosion activity while microspheres' sensing activity is evaluated visually. Electrochemical characterization of AA2024 substrates in the presence of chitosan spheres is performed to understand material performance, and a color change is observed as a result of local pH increase in cathodic areas when corrosion takes place. These findings can be correlated with the results from release studies and seem a promising approach for corrosion sensing purposes, not only because pH increase is possible to detect due to corrosion, but also because chitosan is considered an environmentally friendly material.
publisher WILEY-V C H VERLAG GMBH
issn 1438-7492
isbn 1439-2054
year published 2020
volume 305
issue 2
digital object identifier (doi) 10.1002/mame.201900662
web of science category Materials Science, Multidisciplinary; Polymer Science
subject category Materials Science; Polymer Science
unique article identifier WOS:000504455700001
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journal analysis (jcr 2019):
journal impact factor 3.853
5 year journal impact factor 3.368
category normalized journal impact factor percentile 76.488
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