Study of the Effective Variables on Morphology and Deposition of CaC03 on the Metal Surface

Using an electrochemical technique, deposition and crystal growth of calcium carbonate is investigated on a rotating disk electrode by oxygen reduction under diffusion conditions. The effect of some parameters such as pressure, surfactant, cosalt on morphology and deposition of CaC03 at surface of the stainless steel is investigated using a rotating disk electrode and the scanning electronic microscopic. The results of temperature effect present that the surface deposition reduces with increasing of temperature and decreases with reduction of pH. The pressure has a significant influence on the morphology and the structure of calcium carbonate deposition on the metal surface so that with producing a flow condition at high pressure, nucleation and deposition of calcium carbonate on the metal surface favoured the nanoscale size of CaC03 and leads to reduction in the coverage of surface. In the presence of surfactant, it can be shown that deposition of the calcium carbonate decreases the surface coverage so that after the point of the CMC of CTAB surfactant one can observe a reduction of deposition of the calcium carbonate at the surface. Finally, influence of the monovalent cosalt such as NaCl and KCl presents no certain trend in the deposition, but morphology of the surface is changed.

کلیدواژه ها:

calcium carbonate ، electrochemical technique ، rotating disk electrode ، deposition ، surface coverage ، morphology