Collect. Czech. Chem. Commun. 1987, 52, 88-92

Effect of crystallographic orientation on the kinetics of reaction of aluminium single crystal in aqueous solution of sodium hydroxide

Milica Miadoková, Magdalena Plchová and Ivan Halaša

Department of Physical Chemistry, Comenius University, 842 15 Bratislava


The effect of the concentration of OH- ions, oxygen pressure, and temperature on the rate of reaction of aluminium in aqueous solution of sodium hydroxide was studied for surface planes corresponding to the (100), (110), and (111) crystallographic planes. Kinetic anisotropy was observed: the reaction rate increased and the apparent activation energy decreased in order (100)-(110)-(111). The kinetic parameters were related to some physical characteristics of the surface.