RT info:eu-repo/semantics/article
T1 Use of alumina sludge arising from an electrocoagulation process as functional mesoporous microcapsules for active corrosion protection of aluminum
A1 Souto, Ricardo Manuel
A1 Santana, Juan José
A1 Mena, Víctor
A1 Betancor-Abreu, A.
A1 Rodríguez Raposo, Raquel
A1 Izquierdo Pérez, Javier
A2 Química
A2 Grupo de Electroquímica y Corrosión
Instituto de Materiales y Nanotecnología
K1 Aluminum
K1 Corrosion protection
K1 Functionalized smart coatings
K1 Mesoporous alumina microcapsules
K1 Epoxy coating
K1 Benzotriazole
K1 8-hydroxyquinoline
AB The process of fluoride removal from underground water using the electrocoagulation technique withaluminum electrodes results in the generation of large amounts of drinking-water treatment sludge(DWTS) corresponding to electrocoagulated metal hydroxide sludge (EMHS). EMHS, hazardous for theenvironment, must be adequately managed from the water treatment plant, causing an additional cost tothe process and an environmental impact from its disposal. In this study, the revaluation of the EMHSproduced using a laboratory scale electrocoagulation reactor with aluminum was investigated for themanufacture of mesoporous alumina microcapsules (MAMs). The obtained microcapsules have beencharacterized using X-ray diffractometry (XRD), scanning electron microscopy (SEM), Zeta-potentialmeasurement, thermal gravimetric analysis (TGA), and Brunauer-Emmett-Teller (BET) techniques,allowing them to be classified as mesoporous particles of micro and nanometer dimensions. Theseparticles were used as microcapsules to contain corrosion inhibitors (namely, 8-hydroxyquinoline andbenzotriazole), and they were subsequently dispersed in a commercial polymer matrix employed toprotect aluminum from the corrosive attack of the environment. The corrosion resistance of the resultingfunctionalized coatings has been characterized by electrochemical impedance spectroscopy (EIS) in thecase of artificially-defective coatings, demonstrating that these MAM’s released locally the corrosioninhibitor to effectively heal the damaged area of the metal. The overall study demonstrates that theelectrocoagulation sludge can be employed to produce microcapsules for efficient anticorrosionprotection of engineering metals.
YR 2021
FD 2021
LK http://riull.ull.es/xmlui/handle/915/22004
UL http://riull.ull.es/xmlui/handle/915/22004
LA en
DS Repositorio institucional de la Universidad de La Laguna
RD 07-may-2024