AFM Study on Morphology Evolution of Zinc Electrodeposits

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Nano-size growth of zinc electrodeposit is studied by using atomic force microscopy (AFM). The (0001)<sub>η</sub> and {1010}<sub>η</sub> of hexagonal plate crystals are aligned parallel to the steel substrate with Sn<sup>++</sup> as additive. An AFM cantilever is placed on these planes in order to focus the nano-size growth image on these planes.<br> The (0001)<sub>η</sub> consists of both 30 nm of granular crystals and alignments of these granular crystals, <i>i.e.</i> steps. These steps grow laterally as a result of the embedment of zinc ion clusters to the kinks of steps. The {1010}<sub>η</sub> and initial deposit also consist of these granular crystals.<br> The initial zinc deposits are made up of the edges of hexagonal platelet crystals oriented ten to twenty degree from the substrate. The (0001)<sub>η</sub> of hexagonal platelet crystals becomes parallel to the substrate as the deposit grows with Sn<sup>++</sup> as additive. The {1010}<sub>η</sub>, on the other hand, becomes parallel to the substrate without Sn<sup>++</sup> as additive. These changes in the texture are caused by the locations of nucleation sites of the steps on the (0001)<sub>η</sub>.

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  • ISIJ international  

    ISIJ international 37(2), 140-145, 1997-02-15 

    The Iron and Steel Institute of Japan

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