Inhibition mechanism of NaF on WE43 Mg alloy in NaCl solution  

NaCl溶液中NaF对WE43镁合金的缓蚀机制

作　　者：Yun-tian YANG Yu-xin ZHOU Xiao-peng LU Ji-rui MA Jun-jie YANG Fu-hui WANG 杨云天;周钰昕;卢小鹏;马吉睿;杨俊杰;王福会(东北大学数字钢铁全国重点实验室,沈阳110819;暨南大学先进耐磨蚀及功能材料研究院,广州510632;暨南大学韶关研究院,韶关512027)

机构地区：[1]State Key Laboratory of Digital Steel,Northeastern University,Shenyang 110819,China [2]Institute of Advanced Wear&Corrosion Resistant and Functional Materials,Jinan University,Guangzhou 510632,China [3]Shaoguan Research Institute of Jinan University,Shaoguan 512027,China

出　　处：《Transactions of Nonferrous Metals Society of China》2025年第2期460-473,共14页中国有色金属学报(英文版)

基　　金：National Natural Science Foundation of China(No.52071067);Liaoning Revitalization Talents Program,China(No.XLYC2403026);Shenyang Young and Middle-aged Science and Technology Innovation Talent Support Program of China(No.RC231178);Natural Scienceof Liaoning Province,China(No.2022-YGJC-16);Fundamental Research Funds for the Central Universities,China(No.N2302019);financial supports by the National Natural Science Foundation of China(No.52101084);Guangdong Basic and Applied Basic Research Foundation,China(No.2023A1515011579);Guangzhou Basic and Applied Basic Research Foundation,China(No.2024A04J9889);National Key Research and Development Project of China(No.2023YFB3408200)。

摘　　要：The influence of NaF on the microstructure,composition and corrosion performance of WE43 Mg alloy in 3.5 wt.%NaCl solution was systematically investigated by means of SEM,TEM,EPMA,XRD,XPS and electrochemical measurements.It was proved that NaF is an effective inhibitor for WE43 Mg alloy and the highest inhibition efficiency is 92.6%at its concentration of 40 mmol/L in neutral NaCl solution.The dissolution of WE43 alloy is inhibited by formation and deposition of a dense and protective double-layered corrosion film by chemical reaction between corrosion inhibitor and dissolved Mg^(2+).The microstructure and composition of this double-layered corrosion film were investigated by FIB and TEM.The outer layer of the corrosion film is found to be composed of NaMgF_(3),MgF_(2)and MgO,while the inner layer mainly consists of MgO and MgF_(2).采用SEM、TEM、EPMA、XRD、XPS和电化学测试等方法系统研究了3.5%NaCl(质量分数)溶液中NaF对WE43镁合金显微组织、组成和腐蚀性能的影响。结果表明,NaF是一种有效的WE43镁合金缓蚀剂。在中性NaCl溶液中,当NaF浓度为40 mmol/L时,抑制效率最高,其值为92.6%。缓蚀剂与溶解的Mg^(2+)发生反应,形成并沉积双层致密且具有保护性的腐蚀膜层,抑制了WE43合金的溶解。采用FIB和TEM分析了该双层腐蚀膜层的显微组织和组成。腐蚀膜外层主要由NaMgF_(3)、MgF_(2)和MgO组成,内层主要由MgO和MgF_(2)组成。

关 键 词：Mg alloy CORROSION corrosion film INHIBITOR inhibition mechanism 

分 类 号：TG174.42[金属学及工艺—金属表面处理]