Figure 4.

(a) Dependence of peak voltage, (b) stationary anodic voltage (showing the value measured at 50% of total applied charge), (c) and final voltage on arsenazo-I concentration for Al in 0.6 M malonic acid. (d) Current efficiency η_F, (e) anodizing efficiency, obtained from $\mathrm{d}U/\mathrm{d}\mathsf{\tau }$ η_U, and (f) anodizing efficiency, obtained from dissolved Al³⁺⁻, η_PAOF, as a function of arsenazo-I concentration. Galvanostatic anodizing with 15, 100, and 200 mA·cm⁻², respectively.