Figure 15.

SEM images at various resolutions of porous aluminum oxide film surface (a) and cross-sections (b,c) formed in galvanostatic mode in 0.6 M malonic acid at an anodic current density of 15 mA·cm⁻² with 3.42 g·L⁻¹ arsenazo-I additive, porous aluminum oxide film surface (d) and cross-sections (e,f) formed at an anodic current density of 100 mA·cm⁻² with 3.72 g·L⁻¹ arsenazo-I additive, and porous aluminum oxide film surface (g) and cross-sections (h,i) formed at an anodic current density of 200 mA·cm⁻² with 4.0 g·L⁻¹ arsenazo-I additive.