Benzotriazole encapsulation in spray-dried carboxymethylcellulose microspheres for active corrosion protection of carbon steel

authors	Calegari, F; da Silva, BC; Tedim, J; Ferreira, MGS; Berton, MAC; Marino, CEB
nationality	International
journal	PROGRESS IN ORGANIC COATINGS
author keywords	Corrosion inhibitor encapsulation; Carboxymethylcellulose microspheres; Spray drying; Organic coatings; Active corrosion protection coatings
keywords	INHIBITION; COATINGS; RELEASE; MICROCAPSULES; MICROENCAPSULATION; NANOCONTAINERS; SPECTROSCOPY; BEHAVIOR; DESIGN; MEDIA
abstract	Biopolymeric microspheres containing corrosion inhibitor benzotriazole (BTA) were prepared by a spray-drying technique using carboxymethylcellulose (CMC-Na) as encapsulating material. The resulting microspheres were characterized by FTIR, TGA, SEM and TEM analysis. Microspheres containing BTA have an average diameter of 1.1 mu m. FTIR analysis confirmed the presence of the core and encapsulating components. The release studies by UV - Vis spectrophotometry showed that the mechanism of inhibitor release from CMC-Na biopolymeric matrix is based on a hydrogel-swelling-driven mechanism triggered by water presence. Electrochemical impedance spectroscopy (EIS) measurements on bare carbon steel in NaCl solution revealed that the presence of CMC-Na does not affect the corrosion inhibition mechanism associated with BTA. Furthermore, the microcapsules were added to an epoxy coating and its active corrosion protection performance was also investigated by EIS. The results obtained indicate that capsules loaded with BTA do not affect negatively the barrier properties of the coating, and contribute for the enhancement of the corrosion protection of the metallic substrate. Therefore, this work shows the potential application of carboxymethylcellulose microspheres for development of new environmentally-friendly microcontainers for corrosion inhibitors.
publisher	ELSEVIER SCIENCE SA
issn	0300-9440
year published	2020
volume	138
digital object identifier (doi)	10.1016/j.porgcoat.2019.105329
web of science category	Chemistry, Applied; Materials Science, Coatings & Films
subject category	Chemistry; Materials Science
unique article identifier	WOS:000505157300007