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An improved method was used to investigate the influence of crystallographic orientation on the corrosion of pure magnesium in 0.1N HCl. The corrosion depth and orientation of surface features were mapped against crystallographic orientation (obtained by electron backscatter diffraction) for many off-principal magnesium crystals. The grains near (0001) orientation are the most corrosion resistant. Most grains exhibited a striated structure of long and narrow hillocks with a unique direction.