激光冲击强化对2A02铝合金电化学腐蚀行为的影响  

Effect of Laser Shock Processing on Electrochemical Corrosion Behavior of 2A02 Aluminum Alloy

作　　者：邢清蒲[1] 张凌峰[1,2] 李少哲[1] 鲁金忠[3] 

机构地区：[1]河南科技大学材料科学与工程学院,洛阳471003 [2]河南省有色金属材料科学与加工技术重点实验室,洛阳471003 [3]江苏大学机械工程学院,镇江212013

出　　处：《腐蚀科学与防护技术》2013年第5期402-405,共4页Corrosion Science and Protection Technology

基　　金：国家自然科学基金项目(50735001)资助

摘　　要：采用电化学测量技术和透射电镜,研究了激光冲击强化(LSP)后的2A02铝合金在3.5%NaCl溶液中的耐腐蚀性能。结果表明:在激光冲击过程中,2A02铝合金内产生大量的位错缠结,在这些位错缠结的作用下原始粗晶被细分成各个不同的亚晶,使晶粒得到细化;2A02铝合金表面的残余压应力随着激光冲击次数的增加而增加。同时,随着激光冲击次数的增加,2A02铝合金在3.5%NaCl溶液中的自腐蚀电位和点蚀电位正移,耐腐蚀性能提高。The effect of LSP on electrochemical corrosion behavior of 2A02 aluminum alloy in 3.5% NaCl solution was studied by using electrochemical techniques and transmission electron microscopy. The experimental results showed that large number of dislocations was produced in the alloy after the LSP and then the dislocations piled-up with the increasing number of LSP, which induced the original grains to be subdivided into different subgrains, so the grains are refined. The residual stress on the Al-ally surface increased with the increasing number LSP. Whilst the freecorrosion potential and pitting potential of 2A02 aluminum alloy shifted positively in 3.5%NaCl solution with the number of LSP.

关 键 词：2A02铝合金 电化学腐蚀 激光冲击强化 极化曲线 

分 类 号：TG171[金属学及工艺—金属表面处理]