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

전기화학적 프로세스에 의한 아라고나이트 결정구조 탄산칼슘 막의 형성 및 제어

  • Lee, Seung-Hyo (Division of Marine Engineering, Korea Maritime and Ocean University) ;
  • Lee, Myeong-Hoon (Division of Marine Engineering, Korea Maritime and Ocean University)
  • 이승효 (한국해양대학교 기관공학부) ;
  • 이명훈 (한국해양대학교 기관공학부)
  • Received : 2018.10.16
  • Accepted : 2018.10.29
  • Published : 2018.10.31

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

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Fig. 1. Variation of weight gain of CaCO3 films formed at synthesized soultions.

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Fig. 2. Top surface photographs of CaCO3 films formed at synthesized solutions (NaHCO3 60 mM + CaCl2 60 mM + MgCl2 X).

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Fig. 3. EDS analysis of Ca, Mg of CaCO3 formed at synthesized solutions and their weight gain.

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Fig. 4. XRD patterns of CaCO3 films formed at synthesized solutions (NaHCO3 60 mM + CaCl2 60 mM + MgCl2 X) [16].

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Fig. 5. Formation rate of aragonite crystal structure on CaCO3 films formed at synthesized solutions.

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Fig. 6. Electrochemical anodic polarization behavior curves of CaCO3 films and Fe substrate measured in 3% NaCl solution.

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Fig. 7. Behavior of Natural potential at electrochemical anodic polarization curves of CaCO3 films and Fe substrate measured in 3% NaCl solution.

Table 1. Chemical composition of the synthesized solutions

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Table 2. Weight gain of CaCO3 films formed at various synthesized solutions (NaHCO3 60 nM + CaCl2 60 nM + MgCl2 X)

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