Sb对锌液与X80钢表面润湿性影响的研究  

Effect of Sb on Surface Wettability of Zinc Liquid and X80 Steel

作　　者：崔德荣 雷云 李智伟 苏旭平 刘亚 彭浩平[1,2] CUI De-rong;LEI Yun;LI Zhi-wei;SU Xu-ping;LIU Ya;PENG Hao-ping(Jiangsu Key Laboratory of Oil&Gas Storage and Transportation Technology,Changzhou University,Changzhou 213164,China;Jiangsu Key Laboratory of Material Surface Science and Technology,Changzhou 213164,China)

机构地区：[1]常州大学江苏省油气储运技术重点实验室,江苏常州213164 [2]江苏省材料表面科学与技术重点实验室,江苏常州213164

出　　处：《表面技术》2020年第3期269-274,318,共7页Surface Technology

基　　金：国家自然科学基金(51671037,51871030);江苏省高等学校自然科学研究项目资助(19KJA530001);江苏高校“青蓝工程”;江苏省普通高校研究生科研创新计划项目(KYCX18-0820)。

摘　　要：目的通过添加不同量的Sb元素降低锌液表面张力,提升X80管线钢热浸镀锌可镀性及镀层质量。方法采用改良座滴法在450℃下进行润湿实验,利用轴对称液滴分析软件(ADSA),计算不同Zn-Sb合金熔体在X80钢基板上的接触角,得到450℃时Zn-Sb合金熔体表面张力。通过能谱仪和扫描电子显微镜对镀层表面及截面的微观形貌和组织结构进行分析。结果当Sb添加量为1.0%时,450℃下Zn-Sb合金表面张力约为0.63 N/m,随Sb含量的增加,表面张力逐渐减小,当Sb含量增加到4.0%时,表面张力达到0.46 N/m,远低于纯锌液的0.79N/m。同时,Zn-Sb合金熔体与X80钢的接触角也从最初的57°逐渐减小到43°。锌合金熔体与X80钢界面处形成铁锌化合物组成的连续反应层,且在反应三相线外存在前驱膜,前驱膜的形成使随后的合金液在其上铺展,促进了润湿。结论Sb的添加能有效降低锌液表面张力,减小Zn-Sb合金熔体与X80钢间的接触角。Sb的表面张力较小,倾向于在锌合金表面富集,其作为表面活性元素降低锌液表面张力,从而提高润湿性。The work aims to reduce the surface tension of zinc solution by adding different amounts of Sb element,and to improve the galvanizability and coating quality of X80 pipeline steel.The wettability test was carried out at 450℃by improved sessile-drop method.The contact angle of different Zn-Sb alloy melts on X80 steel substrate was calculated by using Axisymmetric Drop Shape Analysis software(ADSA),the surface tension of the Zn-Sb alloy melt at 450℃was obtained.The results show,when Sb content is 1.0 wt.%,the surface tension of Zn-Sb alloy at 450℃is about 0.63 N/m.The surface tension decreases gradually with the increase of Sb content.When Sb content increases to 4.0 wt.%,the surface tension reaches 0.46 N/m,which is much lower than that of pure zinc melt.At the same time,the contact angle between Zn-Sb alloy melt and X80 steel gradually decreases from 57°to 43°.A continuous reaction layer composed of iron-zinc compound is formed at the interface between the zinc alloy melt and the X80 steel,and a precursor film exists outside the reaction three-phase line,and the formation of the precursor film causes the subsequent alloy liquid spread on it and promotes wetting.The addition of Sb can effectively reduce the surface tension of zinc liquid and reduce the contact angle between Zn-Sb alloy melt and X80 steel.The surface tension of Sb is low and tends to be concentrated on the surface of zinc alloy.As a surface active element,Sb can reduce the surface tension of zinc liquid and improve wettability.

关 键 词：X80钢 热浸镀锌 表面张力 润湿 前驱膜 

分 类 号：TG174.441[金属学及工艺—金属表面处理]