中北大学学报（自然科学版）2024，Vol.45Issue(2)：247-256,10.DOI:10.3969/j.issn.1673-3193.2024.02.015
应变和极化协同作用下裂纹尖端阳极溶解行为
Anodic Dissolution Behavior of Crack Tip Under Synergistic Effect of Strain and Polarization
摘要
Abstract
During the service life of metal materials,the tips of their surface cracks undergo local plastic deformation preferentially under the influence of stress.Additionally,the combined effect of polarization leads to significant differences in both corrosion behavior and corrosion rate between the crack tip and other zones.This research employed a custom-designed in-situ loading platform,integrated with scanning vibrating Electrode technology(SVET)and an electrochemical workstation,to thoroughly investigate the corrosion behavior at the tips of 316L stainless steel cracks in acidic NaCl solutions.Key conclusions are drawn as follows:The crack tip is a stress concentration zone where increased strain leads to the rupture of the passive film at the crack tip and rapid localized anodic dissolution of the metal.When the metal is at open-circuit potential or at a low anodic polarization potential,the newly exposed metal surface at the crack tip can rapidly passivate,causing the total current to briefly rise and then swiftly drop.At higher anodic polarization potentials,even if within the passivation range of 316L stainless steel,the newly exposed metal surface can't repassivate,resulting in sustained anodic dissolution at localized crack tips.Above the pitting potential,not only do pitting corrosion occur on the 316L surface,but the newly exposed metal surfaces due to strain also fail to repassivate,making both the crack tips and pitting sites continual zones of anodic dissolution on the sample surface.关键词
扫描振动电极技术/裂纹尖端/阳极溶解Key words
SVET/crack tip/anodic dissolution分类
矿业与冶金引用本文复制引用
王斯琰,张利涛..应变和极化协同作用下裂纹尖端阳极溶解行为[J].中北大学学报（自然科学版）,2024,45(2):247-256,10.基金项目
山西省自然科学基金面上资助项目(202103021224219) （202103021224219）
