物理化学学报 >> 2009, Vol. 25 >> Issue (07): 1332-1336.doi: 10.3866/PKU.WHXB20090704

研究论文 上一篇    下一篇

十二烷基苯磺酸钠在AZ31镁合金表面的吸附及其缓蚀作用

李凌杰, 姚志明, 雷惊雷, 徐辉, 张胜涛, 潘复生   

  1. 重庆大学化学化工学院, 重庆 400044|重庆大学材料科学与工程学院, 重庆 400044
  • 收稿日期:2008-11-03 修回日期:2009-03-30 发布日期:2009-06-26
  • 通讯作者: 雷惊雷 E-mail:jllei@cqu.edu.cn

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

LI Ling-Jie, YAO Zhi-Ming, LEI Jing-Lei, XU Hui, ZHANG Sheng-Tao, PAN Fu-Sheng   

  1. College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, P. R. China|College of Materials Science and Engineering, Chongqing University, Chongqing 400044, P. R. China
  • Received:2008-11-03 Revised:2009-03-30 Published:2009-06-26
  • Contact: LEI Jing-Lei E-mail:jllei@cqu.edu.cn

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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0.008 mol·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.

关键词: 腐蚀, 镁合金, 十二烷基苯磺酸钠, 吸附, 缓蚀作用

Abstract:

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) NaCl corrosive medium. Results showed that SDBS strongly inhibited the corrosion of AZ31 magnesium alloy in NaCl 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.

Key words: Corrosion, Magnesiumalloy, Sodiumdodecylbenzenesulfonate, Adsorption, Corrosion inhibition