摘要
利用光学显微镜及动电位极化曲线技术,研究了12 mm厚6082-T6铝合金双轴肩搅拌摩擦焊接头组织形貌及其电化学性能.结果表明,主轴转速600 r/min,焊接速度为300 mm/min,搅拌头倾角为0°的焊缝组织出现了明显的变化,焊合区组织发生了动态再结晶,形成细小的等轴晶结构;母材的腐蚀形貌比较粗糙,表面有较深的点蚀坑,而接头焊核区表面腐蚀形貌均一,点蚀现象较轻;动电位极化测试表明双轴肩搅拌摩擦焊接头焊核区的腐蚀电压比母材高,耐腐蚀性能比母材好.
Friction-stir welding(FSW) of 12-mm-thick plates of 6082 Al was conducted by bobbin-tool.Microstructure and potentiodynamic polarization behavior were examined by optical microscope and CHI660A three-electrode electrochemical workstation.The results indicated that the microstructure of the weld was remarkably reshaped under the condition of the stir-pin rotation speed 600 r/min,travel speed 300 mm/min and tilt angle 0° of the stirring tool.The equiaxed grain microstructures were formed due to dynamical recrystallization in the nugget zone.The corrosion test results showed that the pitting corrosion of base material was more severe than that of bobbin-tool FSW weld,and the corrosion morphology was much rough than that of bobbin-tool FSW weld.The corrosion potential of the weld was positive and higher than that of parent material.The corrosion current density of bobbin-tool FSW weld was lower than that of parent material.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2012年第10期5-9,113,共5页
Transactions of The China Welding Institution
基金
重大专项基金资助项目(2011ZX04016-061)
