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Citation: LU Zhao-Ling, QIU Yu-Bing, GUO Xing-Peng. Effect of pH Value on the Adsorption Behavior and Inhibition Mechanism of Dodecylamine on Carbon Steel[J]. Acta Physico-Chimica Sinica, ;2008, 24(02): 243-249. doi: 10.1016/S1872-1508(08)60013-3 shu

Effect of pH Value on the Adsorption Behavior and Inhibition Mechanism of Dodecylamine on Carbon Steel

1.
Key Laboratory of Materials Chemistry and Service Failure of Hubei Province, Department of Chemistry and Chemical Technology, Huazhong University of Science and Technology, Wuhan 430074, P. R. China

Received Date: 12 July 2007
Available Online: 4 January 2008

The effect of pH value on the adsorption behavior and inhibition mechanism of dodecylamine for carbon dioxide corrosion of carbon steel was investigated by electrochemical methods and scanning electron microscopy (SEM). The results indicated that the pH value of the solution played the crucial role to the adsorption behavior and inhibition mechanismof dodecylamine. The inhibition performance of dodecylamine on carbon steel was dependent on the pH value and the inhibition efficiency increased with the increase of pH value. At pH 4.9, dodecylamine mainly inhibited the cathode process of the corrosion. The adsorption energy of dodecylamine on the metal surface was lower. The adsorption of dodecylamine on the metal surface was not stable and an anode desorption phenomenon could be observed. Hence, dodecylamine did not provide effective inhibition to the corrosion. While at pH 6.9, it had much higher adsorption energy. Dodecylamine adsorbed on the metal surface tightly and formed the effective diffusion barrier which inhibited both the cathode and anode processes effectively.
- Carbon dioxide,
- Dodecylamine,
- Adsorption,
- Inhibition mechanism,
- pH value,
- Carbon steel
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