Characterization of Anodic Films Produced on Anodized AA1050 Aluminum Alloy: Effect of Bio-additive

Abstract

In this study, AA1050 aluminum alloy samples were anodized in sulfuric acid baths containing different amounts of environmentally friendly bio-additive (eggshell particles). The morphological, chemical, and structural characteristics of the resulting films were investigated using scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction techniques, respectively. Wear and corrosion resistance of the coatings were evaluated by pin-on-disk and potentiodynamic polarization tests, respectively. The results showed that amorphous films containing less amount of sulfur would be deposited as the concentration of eggshell particles in bath increases. Moreover, coatings with more surface roughness values containing fewer microcracks would be produced in baths containing more eggshell particles. In addition, thicker films with more corrosion and wear resistance values were produced in baths including higher concentrations of eggshell particles. Those samples that were anodized in baths containing eggshell particles exhibited more corrosion and wear resistance in comparison to conventionally anodized ones.