硫脲对非调质钢在HCl酸洗溶液中的缓蚀作用.pdf

表面技术 第45 卷 第 6 期 ·186 · SURFACE TECHNOLOGY 2016 年06 月 硫脲对非调质钢在 HCl 酸洗溶液中的缓蚀作用 肖金华，赵晴，王帅星，杜楠 （南昌航空大学 轻合金加工科学与技术国防重点学科实验室，南昌 330063 ） 摘 要：目的研究硫脲（TU ）对非调质钢在HCl 溶液中的缓蚀作用。方法 通过动电位极化曲线、电 化学阻抗谱研究硫脲对非调质钢在HCl 溶液中的缓蚀效应，采用KH-7700 型三维视频显微镜观察非调 质钢的腐蚀形貌。结果 非调质钢在不含缓蚀剂的HCl 溶液中的自腐蚀电位（Ecorr ）为−0.566 V ，自腐 蚀电流密度（J 2 corr ）为12.57 mA/cm 。随着HCl 溶液中硫脲浓度的增加，非调质钢的自腐蚀电流密度（Jcorr ） 逐渐减小，反应电阻（Rct ）逐渐增大，界面双电层电容Cdl 降低，缓蚀效率逐渐增加，阴极极化曲线几 乎重合，而阳极极化曲线逐渐正移。当HCl 溶液中加入5 g/L 硫脲时，缓蚀效率达91.17% ，效果好于 市售酸洗缓蚀剂AS-30 ，能够有效消除非调质钢在HCl 酸洗液中的腐蚀麻点。结论 硫脲对非调质钢 在HCl 溶液中具有明显的缓蚀效应，能够有效消除非调质钢酸洗过程中的腐蚀麻点。 关键词：非调质钢；硫脲；缓蚀剂；HCl 溶液；麻点；腐蚀形貌；EIS ；极化曲线 中图分类号：TG174.42 文献标识码：A 文章编号：1001-3660(2016)06-0186-06 DOI ：10.16490/j.cnki.issn.1001-3660.2016.06.028 Corrosion Inhibition Effect of Thiourea on Non-quenched and Tempered Steel in HCl Cleaning Solution XIAO Jin-hua, ZHAO Qing, WANG Shuai-xing, DU Nan (National Defence Key Discipline Laboratory of Light Alloy Processing Science and Technology Institute, Nanchang Hangkong University, Nanchang 330063, China) ABSTRACT: Objective To study the inhibition effect of thiourea on corrosion of Non-quenched and tempered steel in HCl solution. Methods The polarization curves and electrochemical impedance were measured by electrochemical workstation. The corrosion morphology of Non-quenched and tempered steel was observed by three-dimensional video microscope. Results The corrosion potential of non-quenched and tempered steel in HCl solution without corrosion inhibitor was −0.566 V, and the corro- sion current density was 12.57 mA/cm2