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http://dx.doi.org/10.5695/JKISE.2018.51.5.325

Formation and Control of Calcium Carbonate Films having Aragonite Crystal Structure by Electro-Chemical Process  

Lee, Seung-Hyo (Division of Marine Engineering, Korea Maritime and Ocean University)
Lee, Myeong-Hoon (Division of Marine Engineering, Korea Maritime and Ocean University)
Publication Information
Journal of the Korean institute of surface engineering / v.51, no.5, 2018 , pp. 325-331 More about this Journal
Abstract
Calcium carbonate($CaCO_3$) films were formed by an eco-friendly electro-chemical technique on steel substrates in synthesized distilled water solutions containing $NaHCO_3$, $CaCl_2$ and $MgCl_2$ with different ratio respectively. It was investigated to confirm the effect of $Mg^{2+}$ concentration by Scanning Electron Microscopy(SEM), Energy Dispersive x-ray Spectroscopy(EDS) and X-Ray Diffraction(XRD) respectively. From an experimental result, only calcite crystals were found in solution containing no $Mg^{2+}$. By increasing concentration of $Mg^{2+}$, deposition rate decreased and crystal structure was transformed form calcite to aragonite. In case of including $MgCl_2$ 300mM in synthesized solutions containing $NaHCO_3$, $CaCl_2$ 60mM, it was showed over the 90% of aragonite contents which have quite high deposition rate of aragonite. Also, it was confirmed that $Mg^{2+}$ acted as inhibitor on the films which made transforming from calcite to aragonite.
Keywords
Calcium carbonate films; Calcite; Aragonite; Electro-chemical process;
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