$\mathrm{c}\mathrm{d}.\mathrm{i}\mathrm{t}\mathrm{o}\mathrm{t}$: current density	M: the molar mass of aluminum
T: time parameter	eff: current efficiency
$\mathsf{\sigma }$: coefficient	$\mathrm{F}\_\mathrm{c}\mathrm{o}\mathrm{n}\mathrm{s}\mathrm{t}$: Faraday’s constant
rho: the density of the aluminum oxide	pro: porosity