Hexagonal Corrosion Pattern upon Cleavage of a Zinc Single Crystal under a Vertical High Magnetic Field

摘要

A two-dimensional hexagonal pattern was observed upon cleavage of a zinc single crystal after attack with sulfuirc acid under a vertical high magnetic field. This phenomenon results from the formation of microscopic magnetohydrodynamic flow (micro-MHD flow) as microscopic vortexes, which interact with fluctuations of the reaction activity. The spatial pattern of the zinc surface is thought to be a result of the growth of fluctuation in the reaction activity about the zinc anodic dissolution, which was stabilized by the micro-MHD vortexes.