Physical and Electrochemical Behavior of Epoxy Coatings Submitted to Drastic Thermal Ageing
Por:
Martin, MEAS, Magana-Zavala, CR, García-Ochoa E., Rodríguez-Gómez F.J.
Publicada:
1 feb 2012
Categoría:
Electrochemistry
Resumen:
With the purpose of evaluating commercial coatings in a short term, many authors report the behavior of coatings through accelerated cyclic tests which start at the lowest temperature and increases up to the highest one. This work presents a drastical thermal ageing cycle for a commercial epoxy coating with an inhibitor pigment. Films applied on low carbon steel and substrate-free films have been evaluated. Both films have been continuously immersed in a 3% wt sodium chloride solution, and heated at four temperature values starting with the highest one of 85 and decreasing each 20 degrees (65, 45) down to 25 degrees C (24 hours in each temperature). Substrate-free films were sampled and electrochemical measurements on painted samples were carried out when the temperature decreased every 24 hours. Analyses of EIS, EN scanning electronic microscopic (SEM), infrared spectroscopy (IR) and differential scanning calorimeter (DSC) were carried out to look for signs of deterioration in the fil
Filiaciones:
Univ Nacl Autonoma Mexico, Fac Quim, Dept Ingn Met, Mexico City 04510, DF, Mexico
Univ Nacl Autonoma Mexico, Inst Fis, Lab Peliculas Delgadas, Mexico City 01000, DF, Mexico
Facultad de Química, Departamento de Ingeniería Metalúrgica Edificio D, UNAM, 04510-México D.F, Mexico
División de Estudios de Posgrado e Investigación, Instituto Tecnológico de Cd., Madero, Tam, Mexico
Instituto de Física, Laboratorio de Películas Delgadas, UNAM, A.P. 20-264, 01000- México, D.F., Mexico
Centro de Investigaciones en Corrosión, Universidad Autónoma de Campeche, Mexico
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