敏化处理对00Cr21NiMn5Mo2N节镍型双相不锈钢堆焊层耐腐蚀性能的影响  

Effect of Sensitization Treatment on Electrochemical Corrosion and Pitting Corrosion of 00Cr21NiMn5Mo2N Stainless Steel

作　　者：包晔峰[1] 武竹雨 陈哲 郭林坡 王子睿 曹冲 宋亓宁 BAO Yefeng;WU Zhuyu;CHEN Zhe;GUO Linpo;WANG Zirui;CAO Chong;SONG Qining(College of Mechanical and Electrical Engineering,Hohai University,Changzhou 213022,China)

机构地区：[1]河海大学机电工程学院,常州213022

出　　处：《中国腐蚀与防护学报》2022年第6期1027-1033,共7页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(51879089)。

摘　　要：采用TIG焊粉末堆焊技术在Q235基体上制备了00Cr21NiMn5Mo2N双相不锈钢堆焊层。在1170℃对堆焊层试样进行固溶处理,之后在800℃分别敏化处理0.5、1、2和4 h,探究经不同时长的敏化处理后材料的组织和性能变化。显微组织观察表明,固溶处理后堆焊层组织由奥氏体(γ)和铁素体(α)两相组成。敏化处理后析出相沿相界析出,且含量随着敏化时间的延长逐渐增多。点蚀浸泡实验、动电位极化曲线测试、电化学阻抗谱测量表明,试样的耐腐蚀性能在敏化时间从0.5 h到2 h时下降;然而,敏化4 h的样品的耐腐蚀性显著提高,甚至超过固溶处理后的耐腐蚀性能。In order to study the effect of the precipitated phase on the corrosion resistance of duplex stainless steel, surfacing layers of 00Cr21NiMn5Mo2N duplex stainless steel were prepared on Q235 via tungsten inert gas(TIG) powder surfacing. The surfacing layered samples were solid-solution treated at1170 ℃, then sensitized at 800 ℃ for 0.5, 1, 2 and 4 h respectively, and then the effect of sensitization time on the microstructure and corrosion resistance of the surfacing layer was assessed. The results showed that the microstructures of the duplex stainless steel surface layers after solution treatment were mainly composed of ferrite phase and austenite phase. After sensitization, the precipitated phase dispersed along phase boundaries, while the content of the precipitated phase gradually increased with the sensitization time. The corrosion resistance of the samples decreased when the sensitization time increased from 0.5 h to 2 h. However, the corrosion resistance of the samples sensitized for 4 h increased significantly. The pitting potential of the sample sensitized for 4 h was 668 mV higher than that of the sample sensitized for 2 h. In addition, the morphology of samples after pitting also reflected the change of pitting resistance of the samples.

关 键 词：TIG粉末堆焊 双相不锈钢 敏化处理 析出相 点蚀 

分 类 号：TG174[金属学及工艺—金属表面处理]