变极性电解酸洗对碳素钢丝表面性质的影响  

Influence of Bipolar Electrolytic Pickling on the Surface Properties of Carbon Steel Wire

作　　者：王震 夏德贵 廖小珍[1] WANG Zhen;XIA De-gui;LIAO Xiao-zhen(School of Chemistry and Chemical Engineering,Shanghai Jiaotong University,Shanghai 200240,China;Bekaert(China)Technology Research&Development Co.,Ltd,Jiangyin 214434,China)

机构地区：[1]上海交通大学化学化工学院,上海200240 [2]贝卡尔特(中国)技术研发有限公司,江苏江阴214434

出　　处：《表面技术》2020年第6期323-329,共7页Surface Technology

基　　金：国家自然科学基金重点项目(21938005)。

摘　　要：目的综合提高碳素钢丝的外观及功能性,深入理解新型变极性电解酸洗过程及其对钢丝表面的修饰作用。方法使用电化学工作站,通过设计电解程序模拟了不同电流密度下的变极性电解酸洗过程,根据电位曲线对电解过程进行分析;通过OM、CLSM、SEM、XPS等手段对酸洗后钢丝的表面性质进行表征。结果非稳态的变极性电解酸洗阳极过程均首先发生Fe的活性溶解,仅当电流密度高至816.0 A/dm^2时可使钢丝表面迅速转入钝态,并进一步极化至析氧过程。极低电流密度下(54.4 A/dm^2)的酸洗可获得光亮的表面;较高电流密度下(163.2~272.0 A/dm^2)的酸洗会使钢丝表面发暗,氧化程度变高,但形成了特殊的片层状表面微观形貌;更高电流密度(544.0 A/dm^2)的酸洗会导致钢丝表面过度侵蚀,呈破碎状态;而极高电流密度(816.0 A/dm^2)下的酸洗,获得了同时具有片层状微观形貌的光亮表面。结论通过控制酸洗电流密度可调控碳素钢丝的外观、表面微观形貌及氧化程度。816.0 A/dm^2电流密度下的电解酸洗可使钢丝保持光亮的同时形成片层状的微观形貌,可能使后续镀层具有特殊的功能性。The work aims to improve both the appearance and functionality of carbon steel wire,so as to deeply understand the bipolar electrolytic pickling process and its influence on the surface of steel wire.Electrochemical station was used to simulate the bipolar electrolytic pickling process by designing the electrolytic program under different current densities and the electrolytic process was analyzed according to potential curve.The pickled surface of steel wire was characterized via OM,CLSM,SEM and XPS.Fe dissolving occurred firstly during the non-steady anodic processes.The surface could only be passivated rapidly when the current density was up to 816.0 A/dm^2,after which the anodic process was further polarized so that oxygen evolution occurred.The pickling under extremely low current density(54.4 A/dm^2)resulted in shining surface.The pickling under high current density(163.2~272.0 A/dm^2)resulted in a dark and oxidized surface,but with special lamella surface morphology.The pickling under higher current density of 544.0 A/dm^2 corroded the surface of steel wire which was nearly broken,but a shining surface together with lamella morphology could be obtained under extremely high current density of 816.0 A/dm^2.Apparently,the carbon steel wire surface properties(i.e.appearance,surface morphology and oxidation state)can be modified by controlling the current density,and the pickling under the current density of 816.0 A/dm^2 can keep the steel wire shining with lamella surface morphology,thus providing functionality for subsequent coating.

关 键 词：变极性电解酸洗 碳素钢丝 电流密度 光亮表面 片层状形貌 

分 类 号：TQ151.6[化学工程—电化学工业]