Abstract
The dependence of corrosion behavior of 99.999% (5N) purity aluminum on crystallographic orientation has been investigated in four concentrations of hydrochloric acid aqueous solutions. Before corrosion test the surface of specimen was analyzed to examine crystallographic orientation distribution, and then using SEM/EBSD technique the same area was observed by optical microscopy to detect corrosion behavior. Steps formed during the corrosion test at grain boundaries were precisely measured using geometrical calculation based on SEM observation and laser microscopy. It was confirmed that the corrosion behavior depended strongly on the crystallographic orientation of the planes parallel to the surface. Moreover, the orientation dependence was varied with the concentration of the solution. While {101} and {111} plane have corrosion resistance in low concentrations of 1.5 mol/L and 2.9 mol/L HCl, the pitting rate on {111} plane was highest in high concentrations of 5.8 mol/L and 11.6 mol/L HCl.
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