Effect of anodizing parameters on the growth of porous anodic aluminum oxide on al-mn alloys

Abstract

In this study, the effect of manganese content, anodizing voltage and concentration of electrolyte on pore nucleation process during anodizing was studied from current density versus time transient. It was found that the addition of manganese into the aluminum substrate retarded the pore nucleation process and reduced the steady state current density. Increasing the anodizing voltage facilitated the pore nucleation and increased the overall current density. However, when the anodizing voltage is 70V, dielectric breakdown occurred. When the concentration of electrolyte was increased, no changes to the pore nucleation stage occurred. The overall current density increased when the concentration of electrolyte increased.