Corrosion Inhibitors in the Development of Hybrid-Smart-Nanostructured Coatings

Tuesday, 7 October 2014
Expo Center, 1st Floor, Center and Right Foyers (Moon Palace Resort)
G. E. Zambrano-Rengel (Centro de Investigación en Ingeniería y Ciencia Aplicadas, CIICAp-UAEM), J. Uruchurtu (Centro de Investigación en Ingeniería y Ciencias Aplicadas, CIICAp-UAEM), C. Menchaca (Centro de Inventigación en Ingeniería y Ciencias Aplicadas, CIICAp-UAEM), and R. Guardián Tapia (Centro de Investigación en Ingeniería y Ciencias Aplicadas, CIICAp-UAEM)
Results of the corrosion behavior of inhibitors contained inside of ceramic nanoparticles as part of the development of a hybrid smart coating used to protect pieces of copper used in the manufacture of historical pieces belonging to the cultural heritage .
The kaolin is a waste product from the ceramic industry with porous properties that facilitate the process of absorption of chemicals inhibitors of the corrosion process as benzotriazole (BTA) and copper sulfate pentahydrate (CuSO4.5H2O). The optimal efficiency of the inhibitors was determined using gravimetric methods and using potentiodynamic  polarization . The adsorption of the inhibitors is reached  preparing several mixtures of acetone and distilled water saturated with inhibitor through a process of stirring for 24 hours . Copper samples were coated with a commercial brush No. 10 using epoxy resin mixed with 2.5 %, 5% and 10 % of kaolin nanoparticles doped with inhibitor. The system was characterized using electrochemical techniques like electrochemical impedance spectroscopy (EIS), potentiodynamic  polarization methods and electrochemical noise spectroscopy (EN) to determine the efficiency of the new structured kaolin particles into the coating. The electrolytic solution for the application of electrochemical techniques was a mixture of NaCl. and (NH4)2SO4, used to study atmospheric corrosion; simulating contaminated atmospheres with chlorides and sulfates in urban environments. The techniques used for materials characterization were scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) like a great complement to the complete study of the system.