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

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• 作者：Kiana Peyv ; i ; Ali Haghtalab ; Mohammad Reza Omidkhah
• 关键词：A1. Crystal morphology ; A3. Polycrystalline deposition ; B1. Barium compound ; B1. Calcium compound
• 刊名：Journal of Crystal Growth
• 出版年：2012
• 出版时间：1 September, 2012
• 年：2012
• 卷：354
• 期：1
• 页码：109-118
• 全文大小：1575 K

文摘

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.