Using an electrochemical technique to study the effective variables on morphology and deposition of CaCO3 and BaSO4 at the metal surface

作者：Peyvandi Kiana; Haghtalab Ali^*; Omidkhah Mohammad Reza

来源：Journal of Crystal Growth, 2012, 354(1): 109-118.

DOI：10.1016/j.jcrysgro.2012.05.020

• Crystal morphology
• Polycrystalline deposition
• Barium compound
• Calcium compound

In this work using an electrochemical technique, deposition and crystal growth of calcium carbonate and barium sulphate at a stainless steel electrode is investigated through a rotating disk electrode involving oxygen reduction under diffusion condition. The influence of some parameters such as pressure, temperature, surfactant, cosalt and pH on morphology and deposition of CaCO3 and BaSO4 at surface of the stainless steel are studied. The results of the temperature tests reveal that the surface deposition is reduced by increase of the temperature and decrease of pH. The pressure also proves to have a significant influence on the morphology and the structure of calcium carbonate and barium sulphate deposition at the metal surface. With establishing a flow condition at high pressure, nucleation and deposition of calcium carbonate and barium sulphate at the metal surface generate the nano size of CaCO3 and BaSO4 crystals and leads to reduction of the coverage of the surface. In the presence of surfactant, it is shown that deposition of the calcium carbonate decreases the surface coverage so that after the point of the critical molar concentration of surfactant, a reduction of deposition of the calcium carbonate and barium sulphate at the surface can be clearly observed. Finally, influence of monovalent cosalts such as NaCl and KCl are investigated so that it does not present any certain trend in the deposition; however the morphology of the deposited crystal considerably changes.

• 出版日期2012-9-1