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Citation: LI Ling-Jie, YAO Zhi-Ming, LEI Jing-Lei, XU Hui, ZHANG Sheng-Tao, PAN Fu-Sheng. Adsorption and Corrosion Inhibition Behavior of Sodium Dodecylbenzenesulfonate on AZ31 Magnesium Alloy[J]. Acta Physico-Chimica Sinica, ;2009, 25(07): 1332-1336. doi: 10.3866/PKU.WHXB20090704 shu

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

1.
College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, P. R. China

Received Date: 3 November 2008
Available Online: 17 April 2009

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.
- Corrosion,
- Magnesiumalloy,
- Sodiumdodecylbenzenesulfonate,
- Adsorption,
- Corrosion inhibition
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