Influence of impurities in aluminium on surface treatment

Metallographic effects of pure aluminum on properties of nanoporous anodic alumina (NPAA)

“…e and f. These results showed that electropolishing may affect the orientation of aluminum crystals during preheating. Although the effect of electropolishing on the surface texture of aluminum substrate and on the self‐ordering of pores in anodic alumina have already been investigated, no detailed work has been conducted on the effect of preheating at various recrystallization conditions on the crystal orientation of electropolished aluminum and accordingly on its effect on both pore regularity and the stability of the amorphous NPAA formed on the aluminum substrate and particularly of the α‐NPAA membrane films. Caicedo‐Martinez C.E.…”

“…Caicedo‐Martinez C.E. et al . studied the influence of the grain orientation on the surface texture obtained after the electropolishing and chemical polishing treatments of the aluminum and aluminum alloy, which discrete peaks for (100), (110), and (111) grain orientations on the texture is reveled.…”

Effect of grain orientation on the morphology, dielectric breakdown and optical behaviour of anodic film formed on Al–2wt%Cu binary alloy

“…Grain orientation dependent nanoscale textures on aluminium surface have been examined in previous work [13]. After combined electropolishing and chemical polishing, aluminium disclosed surface texture comprised of peaks and troughs, namely close-packed hexagonal, furrow type and discrete peaks for Previous work [11] on the morphological development of oxygen gas bubbles in anodic films revealed that the generation of oxygen coincides with the oxidation of copper from the enriched alloy layer, suggesting it is related to formation of film material containing copper species.…”

Copper redeposition and surface enrichment during the dissolution of Al‐Cu alloys in different concentrations of NaCl solution. Part 1 – electrochemical measurements

“…The phenomenon of enrichment of alloying elements or impurities, especially the effect of intermetallic particles on Al-Cu alloys corrosion, has been studied extensively by several research groups Buchheit et al, 1999Buchheit et al, , 2000aCaicedo-Martinez, 2002). Zhou et al tried to explain the phenomenon of enrichment of Cu on Al-Cu alloy by electropolishing and anodic oxidation of the pre-enrichment of copper, as both Al and Cu atoms are oxidised immediately at the alloy/film interface on subsequent anodizing.…”