不同固溶制度对6082铝合金力学性能和腐蚀性能的影响

Effect of different solid solution treatment on mechanical properties and corrosion properties of 6082 aluminum alloy

采用拉伸力学性能试验、电导率性能试验、剥落腐蚀试验、晶间腐蚀试验、光学显微镜、扫描电镜、透射电镜等研究了不同固溶工艺对轨道交通用6082合金板材力学性能和腐蚀性能的影响。结果表明:530~560℃固溶及180℃时效处理后,6082合金板材的屈服强度和抗拉强度随着固溶温度升高而升高,而伸长率几乎保持不变。在530~560℃不同温度固溶处理的时效态6082板材的剥落腐蚀等级均为N级,显示出良好的耐剥落腐蚀性能,最大晶间腐蚀深度随着固溶温度升高而增加。不同温度固溶处理后时效态6082合金板材的晶界处均没有沉淀物析出,晶界附近的无沉淀析出带(PFZ)越宽,最大晶间腐蚀深度越深。

Tensile mechanical properties test,conductivity performance test,exfoliation corrosion test,intergranular corrosion test,optical microscope,scanning electron microscopy and transmission electron microscopy were used to study the effects of different solid solution treatment on mechanical properties and corrosion properties of 6082 alloy plate for rail transit.The results show that after solid solution treatment at 530-560℃and aging at 180℃,the yield strength and tensile strength of the 6082 alloy plate increase with the increase of solid solution temperature,while the elongation is almost unchanged.The exfoliation corrosion grade of the 6082 alloy plate after different solid solution and aging treatment is N grade,which shows good resistance to exfoliation corrosion,and the maximum intergranular corrosion depth increases with the increase of solid solution temperature.After solid solution treatment at different temperatures,there is no precipitation at the grain boundary of the aged 6082 alloy plate.The wider the precipitates free zone(PFZ)near the grain boundary,the deeper the maximum intergranular corrosion depth.