直流和脉冲电流对碳酸钙电沉积的影响  

Effect of direct current and pulse current on CaCO_(3) electrodeposition

作　　者：王啸 杨文忠 WANG Xiao;YANG Wenzhong(College of Chemistry and Molecular Engineering,Nanjing Tech University,Nanjing 210037,China)

机构地区：[1]南京工业大学化学与分子工程学院,江苏南京210037

出　　处：《工业水处理》2024年第1期126-131,共6页Industrial Water Treatment

摘　　要：电化学沉积碳酸钙是减轻工业水系统中结垢的方法之一。采用脉冲电流和直流电研究CaCO_(3)的电化学沉积过程,以及不同离子对脉冲沉积CaCO_(3)的影响,并通过扫描电子显微镜和X射线衍射对其晶型和晶貌进行表征。实验结果表明,脉冲电流下CaCO_(3)在304SS电极的成核速率快于直流电流,其促进了碳酸钙的熟化过程。Fe^(3+)、PO_(4)^(3-)、SiO_(3)^(2-)和Mg^(2+)的加入加速了CaCO_(3)的结晶,但降低了沉积的致密性和厚度。脉冲电沉积的熟化过程使得结晶倾向于形成粒径更大的层叠形貌方解石,且方解石粒径大于直流电沉积所得。Electrochemical deposition of CaCO_(3) is one of the methods to reduce scaling in industrial water system.The pulse current(PC)and direct current(DC)were used to study the electrodeposition process of CaCO_(3),and the influence of different ions on PC electrodeposition of CaCO_(3).The crystal morphology of CaCO_(3) were characterized by SEM and XRD.The experimental results showed that the nucleation rate of CaCO_(3) on 304SS electrode under PC is faster than that under DC,which promoted the ripening process of calcium carbonate.The addition of Fe^(3+),PO_(4)^(3-),SiO_(3)^(2-)and Mg^(2+)accelerated the crystallization of CaCO_(3),but decreased the density and thickness of the deposition.The ripening process of PC electrodeposition makes the crystallization tend to form layered calcite with larger par⁃ticle size,and the calcite particle size is larger than that obtained by DC electrodeposition.

关 键 词：脉冲电流 电沉积 碳酸钙垢 熟化 

分 类 号：TQ085[化学工程]