Effect of a Natural Additive in Triethanolamine during the Anodizing of 7050 Aluminum ; Efecto de un Aditivo Natural en Trietanolamina durante el Anodizado de Aluminio 7050 ; Efeito de um Aditivo Natural em Trietanolamina durante a Anodização do Alumínio 7050

Sulfuric acid is the main electrolyte in anodizing processes; however, high concentrations of this substance are harmful to the environment due to the byproducts it generates. The objective of this study was to evaluate the influence of the fruit of Caesalpinia coriaria (divi-divi) combined with triethanolamine (TEA) in a low concentration of sulfuric acid, on the oxide film generated during the anodizing of 7050 aluminum. To carry out this objective, an electrolytic cell was designed where the anodization process was carried out. An epoxy coating for aerospace applications was applied to the already treated specimens. Finally, they were characterized according to: oxide layer thickness using Eddy currents and “pull-off” adhesion test. It was revealed that C. coriaria affects the protective film, increasing its thickness by an average of 1.6 ± 0.1 µm, with respect to the sample that was treated only with TEA. Similarly, in the adhesion test, although results greater than 6,800 kPa were obtained, it was concluded that additional tests must be carried out with higher resistance epoxy adhesives to generate accurate results ; El ácido sulfúrico es el electrolito más utilizado en los procesos de anodizado; no obstante, altas concentraciones de esta sustancia son perjudiciales para el ambiente debido a los subproductos que genera. El objetivo de este estudio fue evaluar la influencia del fruto de Caesalpinia coriaria (dividivi) combinado con trietanolamina (TEA), en una baja concentración de ácido sulfúrico, sobre la película de óxido generada durante el anodizado de aluminio 7050 y su efecto en la adherencia de recubrimientos poliméricos. Para ello, se diseñó una celda electrolítica donde se realizó el proceso de anodización. A las probetas ya tratadas, se les aplicó un recubrimiento epóxico de aplicación aeroespacial. Finalmente, fueron caracterizadas, según: espesor de capa de óxido mediante corrientes de Eddy y prueba de adherencia “pull-off”. Se reveló que C. coriaria si afecta la película protectora, aumentando ...