结构取向对超细晶层状结构304L不锈钢抗点蚀性能的影响  

Effect of Structural Orientation on the Pitting Corrosion Resistance of Ultrafine-lamella-grained 304L Stainless Steel

作　　者：徐祖缘 李建生 王晓震 秦文波[3,4] 周新宇 利助民 姜伟 王刚 XU Zuyuan;LI Jiansheng;WANG Xiaozhen;QIN Wenbo;ZHOU Xinyu;LI Zhumin;JIANG Wei;WANG Gang(School of Materials Science and Engineering,Anhui Polytechnic University,Wuhu 241000,China;Postdoctoral Research Center,Anhui Xinke New Materials Co.,Ltd.,Wuhu 241006,China;School of Engineering and Technology,China University of Geosciences(Beijing),Beijing 100083,China;Technology Research and Development Center,HYMN Advance Materials Technology(Shenzhen),Shenzhen 518000,China)

机构地区：[1]安徽工程大学材料科学与工程学院,安徽芜湖241000 [2]安徽鑫科新材料股份有限公司博士后工作站,安徽芜湖241006 [3]中国地质大学(北京)工程技术学院,北京海淀100083 [4]彗晶新材料科技(深圳)有限公司技术研发中心,广东深圳518000

出　　处：《安徽工程大学学报》2025年第1期58-63,共6页Journal of Anhui Polytechnic University

基　　金：国家自然科学基金项目(42202343);高性能有色金属材料安徽省重点实验室开放基金(YSJS-2023-01);大学生创新创业训练计划(202310363185)。

摘　　要：本研究通过多向热锻工艺制备出具有超细晶层状结构的304L不锈钢板材,采用传统的三电极电化学实验测试超细晶层状结构304L不锈钢样品不同结构取向面(截面及平面)的抗点蚀性能,利用三维轮廓形貌仪和扫描电子显微镜(SEM)观察点蚀坑的形貌,探讨在3.5 wt.%NaCl溶液中超细晶层状结构304L不锈钢样品不同结构取向面的点蚀机制。实验结果表明:超细晶层状结构304L不锈钢样品截面的击穿电压、腐蚀电压、腐蚀电流分别为293 mV、-117 mV和1.0×10^(-7) A/cm^(2),样品截面较样品表面表现出更好的抗点蚀性能,其主要原因是超细晶层状结构304L不锈钢样品截面具有更高密度的晶界,提高了Cr的扩散速率,当钝化膜被破坏时能促进富Cr钝化膜的再生,增强其抗点蚀性能。The ultrafine-lamella-grained 304L stainless steel sheet was prepared by a multi-directional hot forging technique.The pitting corrosion behavior of the normal plane and transverse plane of the ultrafine-lamella-grained 304L stainless steel was studied by using a traditional three-electrode cell.The morphologies of the corrosion pits were characterized by using a three-dimensional contour profiler and SEM,which revealed the influence of the structural orientation on the pitting behavior of the ultrafine-lamella-grained 304L stainless steel in a 3.5 wt%NaCl solution.The experimental results showed that the pitting potential,corrosion potential,and corrosion current of the transverse plane of ultrafine-lamella-grained 304L stainless steel sheet are 293 mV,-117 mV and 1.0×10^(-7) A/cm^(2),respectively.This indicated an enhanced pitting corrosion resistance for the transverse plane of the ultrafine-lamella-grained 304L stainless steel,which was ascribed to the increase of the diffusion rate of Cr by the high-density grain boundaries.

关 键 词：多向热锻 304L不锈钢 超细晶层状结构 结构取向 点蚀机制 

分 类 号：TG171[金属学及工艺—金属表面处理]