十二烷基苯磺酸钠在AZ31镁合金表面的吸附及其缓蚀作用  

Adsorption and Corrosion Inhibition Behavior of Sodium Dodecylbenzenesulfonate on AZ31 Magnesium Alloy

作　　者：李凌杰[1,2] 姚志明[1] 雷惊雷[1] 徐辉[1] 张胜涛[1] 潘复生[2] 

机构地区：[1]重庆大学化学化工学院,重庆400044 [2]重庆大学材料科学与工程学院,重庆400044

出　　处：《物理化学学报》2009年第7期1332-1336,共5页Acta Physico-Chimica Sinica

基　　金：国家杰出青年科学基金(50725413);教育部留学回国人员科研启动基金(教外司留[2007]1108-6);重庆市科委自然科学基金(CSTC;2008BB4174)资助项目~~

摘　　要：采用电化学阻抗谱(EIS)和极化曲线研究十二烷基苯磺酸钠(SDBS)对AZ31镁合金在3.5%(w,质量分数)NaCl腐蚀介质中的吸附行为及缓蚀作用.结果表明:SDBS可有效抑制AZ31镁合金在NaCl介质中的腐蚀,其浓度为0.008mol·L-1时缓蚀效率可达90%以上;升高温度并不利于提高SDBS的缓蚀效率.SDBS在AZ31镁合金表面主要发生物理吸附,吸附过程为放热、熵增的自发过程,近似符合Langmuir单分子层吸附模型;SDBS为混合抑制型缓蚀剂,但主要抑制阳极反应.Electrochemical impedance spectroscopy （EIS） and polarization curves were used to study the adsorption and corrosion inhibition of sodium dodecylbenzenesulfonate （SDBS） on AZ31 magnesium alloy in 3.5% （w, mass fraction） NaC1 corrosive medium. Results showed that SDBS strongly inhibited the corrosion of AZ31 magnesium alloy in NaC1 medium. The inhibition efficiency of 0.008 mol＇L-1 SDBS was more than 90%. Increasing temperature did not increase the inhibition efficiency. Physical adsorption of SDBS at the AZ31 magnesium alloy surface mainly occurred. The adsorption process was spontaneous and exothermic and the entropy increased, which obeyed the Langmuir isotherm. SDBS is a mixed-type inhibitor and mainly inhibits the anodic dissolution reaction of AZ31 magnesium alloy.

关 键 词：腐蚀 镁合金 十二烷基苯磺酸钠 吸附 缓蚀作用 

分 类 号：TG171[金属学及工艺—金属表面处理]