128720.fig.001a
(a)
128720.fig.001b
(b)
128720.fig.001c
(c)
128720.fig.001d
(d)
Figure 1: SEM images of aluminum conversion layers in cerium bath (0.1 g L−1) at different concentrations of accelerator (boric acid); (a) 0, (b) 0.1, (c) 0.5, and (d) 1 g L−1.