Cu及热处理制度对Al-Mg-Si系合金晶间腐蚀敏感性的影响  

Effects of Cu and age treatment on susceptibility to intergranular corrosion of Al-Mg-Si alloys

作　　者：何立子[1] 张晓博[1] 孙秋霞[1] 崔建忠[1] 

机构地区：[1]东北大学材料与冶金学院,沈阳110006

出　　处：《中国有色金属学报》2001年第2期231-235,共5页The Chinese Journal of Nonferrous Metals

基　　金：国家"九五"重点科技项目! (98-A2 8-0 1-0 9)

摘　　要：采用浸泡腐蚀实验和电化学实验研究了强化元素Cu含量的改变及不同时效制度对Al Mg Si合金晶间腐蚀敏感性的影响 ,并利用XRD和SEM对腐蚀产物的构成及形貌进行了分析与观察。浸泡腐蚀实验结果表明 :在峰时效的状态下 ,在 0 .5 %Cu以上的合金中可观察到明显的晶间腐蚀 ,而且随着Cu含量的增加 ,合金最大腐蚀深度增加 ;在欠时效状态下 ,1%Cu以上的合金中观察到了微弱的晶间腐蚀 ;在过时效状态下 ,所有实验合金均只出现点蚀。电化学实验结果表明 :随着Cu含量的增加 ,合金的 φcorr向正的方向变化 ,Jcorr增加 ,欠时效状态下的 φcorr比峰时效状态下的负 。By the immersion corrosion tests and electrochemistry tests, the effects of changing Cu content and varying age treatments on the susceptibility to intergranular corrosion of Al Mg Si alloys have been studied. Phase structures of corrosion products were analyzed by XRD and the corrosion morphologies were observed by SEM.The results of immersion corrosion tests show that obvious intergranular corrosion is detected on the alloys with over 0.5%Cu and the maximum corrosion depth increases with increasing Cu content after the precipitation treatment. Slight intergranular corrosion is found on the alloys with over 1%Cu after the under aged treatment. Pitting is observed on all alloys after the over aged treatment. Results of electrochemistry tests indicate that φ corr varies to positive and J corr increases with increasing Cu content. The φ corr and J corr under the under aged condition are more negative and smaller respectively than those under the precipitation age condition.[

关 键 词：AL-MG-SI合金 铜 晶间腐蚀 时效 热处理制度 

分 类 号：TG174.22[金属学及工艺—金属表面处理] TG146.21[金属学及工艺—金属学]