Influence of Mg~(2+) on Initial Stages of CaCO_3 Scale Formed on Metal Surface

• 作 者: Anne Neville
• 机 构: chool of Mechanical Engineering, University of Leeds Leeds, LS2 9JT, UK
• 出 处: Chemical Research in Chinese Universities
• 发表日期: 2004年04期
• 关键词: coverage nucleation nuclei incorporated magnesium viscosity fouling adsorbed rem

Magnesium ions, which exist in formation water and injection water under downhole conditions in the oil and gas production industry, are a key determinant in the CaCO_3 scale formation. Many studies have focused their attention on the effect of magnesium on the kinetics, the morphology and the content of Mg in the CaCO_3 scale. Little attention has been paid to the effect of Mg 2+ on the initial stages of CaCO_3 formation on a metal surface. In this study, an electrochemical technique was used to study the influence of Mg 2+ on the initial stages of CaCO_3 scale formed on a metal surface. With this electrochemical technique, the reduction of the dissolved oxygen in an analysis solution is considered on the surface of a rotating disk electrode(RDE) under potentiostatic control.The rate of oxygen reduction on the surface of the RDE enables the extent of surface coverage of scale to be assessed. With this electrochemical technique, a new insight into the effect of Mg 2+ on CaCO_3 scale formed on a metal surface is given.

Magnesium ions, which exist in formation water and injection water under downhole conditions in the oil and gas production industry, are a key determinant in the CaCO_3 scale formation. Many studies have focused their attention on the effect of magnesium on the kinetics, the morphology and the content of Mg in the CaCO 3 scale. Little attention has been paid to the effect of Mg 2+ on the initial stages of CaCO 3 formation on a metal surface. In this study, an electrochemical technique was used to study the influence of Mg 2+ on the initial stages of CaCO_3 scale formed on a metal surface. With this electrochemical technique, the reduction of the dissolved oxygen in an analysis solution is considered on the surface of a rotating disk electrode (RDE) under potentiostatic control. on the surface of the RDE enables the extent of surface coverage of scale to be assessed. With this electrochemical technique, a new insight into the effect of Mg 2+ on CaCO 3 scale formed on a metal surface is given.