金属表面处理剂对2205双相不锈钢PAW焊力学性能和腐蚀行为的影响  

Effect of Metal Surface Treatment Agents on the Mechanical Properties and Corrosion Behavior of 2205 Duplex Stainless Steel by PAW

作　　者：徐明亮 乔红宇 曹将栋 仇潞 尚振一 张腾 XU Mingliang;QIAO Hongyu;CAO Jiangdong;QIU Lu;SHANG Zhenyi;ZHANG Teng(Jiangsu Shipping College,Jiangsu Nantong 226010,China;Nantong Jingyiyuan Electromechanical Standard Parts Manufacturing Co.,Ltd.,Jiangsu Nantong 226010,China)

机构地区：[1]江苏航运职业技术学院,江苏南通226010 [2]南通市精异圆机电标准件制造有限公司,江苏南通226010

出　　处：《表面技术》2024年第20期94-101,共8页Surface Technology

基　　金：南通市基础科学研究面上项目(JC22022052);南通市自然科学基金面上项目(JCZ2023033);江苏航运职业技术学院科技类研究课题(HYKY/2023B02);江苏省自然科学基金面上项目(BK20231227)。

摘　　要：目的提高等离子弧焊(PAW)焊接2205双相不锈钢的力学性能和耐腐蚀性能。方法采用金属表面处理剂为介质,对2205双相不锈钢PAW焊接接头进行保护试验,研究了金属表面处理剂对2205双相不锈钢PAW焊接接头力学性能和耐腐蚀性能的影响,采用扫描电镜、能谱分析、维氏硬度仪、万能试验机和电化学工作站等,对2205双相不锈钢原始试样、2205双相不锈钢PAW焊无金属表面处理剂保护试样、2205双相不锈钢PAW焊金属表面处理剂保护试样的性能进行分析。结果在经过金属表面处理剂保护的2205双相不锈钢PAW焊中,金属表面处理剂中化学元素扩散至材料表面,扩散深度不小于0.005 mm。与未采用金属表面处理剂保护焊缝相比,焊缝硬度为262HV~271HV,提高了25%,热影响区硬度为262HV~271HV,提高了15%。万能试验机拉伸试验分析结果表明,双相不锈钢焊接接头抗拉强度提高了20%,有效提高了2205双相不锈钢PAW焊接头的力学性能。电化学试验结果表明,在2205双相不锈钢金属表面处理剂保护PAW焊中,动电位极化曲线的点蚀电位与自腐蚀电位差最大分别为0.2876 V和0.5554 V。维钝电流密度最小,交流阻抗分析结果表明其容抗弧半径最大,钝化膜内层电阻最大为7.531×10^(5)Ω·cm^(2),有效提高了其抗腐蚀能力。结论经过金属表面处理剂保护的2205双相不锈钢PAW焊后,焊接接头的力学性能和抗腐蚀性能最好。Plasma arc welding(PAW)technology is a new protection method for the welding process of 2205 duplex stainless steel,in which new protection devices are added outside the welding process,and self-formulated metal surface treatment agents are used to protect the PAW joints of 2205 duplex stainless steel.The work aims to improve the mechanical properties and corrosion resistance of 2205 duplex stainless steel.With the metal surface treatment agent as the medium,the protection experiment was conducted on the 2205 duplex stainless steel PAW joint and the effect of metal surface treatment agent on the mechanical properties and corrosion resistance of the welded joint was studied.Scanning electron microscopy,energy spectrum analysis,Vickers hardness tester,universal testing machine,and electrochemical workstation were used to analyze the properties of original sample,protected sample without metal surface treatment agent and protected sample with metal surface treatment agent of 2205 duplex stainless steel during PAW.The experimental results of the three samples were compared.The comprehensive results analysis showed that 2205 duplex stainless steel was protected by a metal surface treatment agent.The elements in the metal surface treatment agent diffused into the material,forming a protective layer with a diffusion depth of no less than 0.005 mm.The Vickers hardness tester analysis showed that the weld hardness was 262HV-271HV,an increase of 25%,and the hardness in heat affected zone was 262HV-271HV,an increase of 15%.The tensile test analysis of the universal testing machine showed that the tensile strength of the duplex stainless steel welded joint increased by 20%,effectively improving the mechanical properties of the 2205 duplex stainless steel PAW joint.By electrochemical workstation experiments,a comprehensive analysis was conducted on the dynamic potential and AC impedance of the original 2205 duplex stainless steel sample,the sample without metal surface treatment agent,and the sample with metal surface treatme

关 键 词：双相不锈钢 金属表面处理剂 PAW焊 力学性能 抗腐蚀性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]