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INHIBITION PERFORMANCE AND MECHANISM OF LAURIC ACID IN CO2 SATURATED NaCl SOLUTION |
LU Zhaoling1, GUO Xingpeng2 |
1. Analysis and Testing Center, Huazhong University of Science & Technology, Wuhan 430074
2. School of Chemistry & Chemical Technology, Wuhan 430074 |
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Abstract The inhibition performance of lauric acid on N80 steel in CO2 saturated NaCl solution at different pH values (4.9, 6.9 and 7.4 respectively) were investigated using electrochemical methods and the attenuated total reflection Fourier-transform infrared (ATR-FTIR). The results showed that lauric acid has more obvious inhibition ability to the cathode process in the lower pH value. While at higher pH value, the inhibition effect is more obvious to the anode process. At the middle pH value, it showed the transition-state characteristics and has the inhibition effect both to anode and cathode processes. The different adsorption state of the inhibitor at various pH values has different interaction with the metal surface which explains the difference of the inhibition performance in the test environments.
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Received: 09 August 2010
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Corresponding Authors:
Lu Zhaoling
E-mail: zhaolinglu@126.com
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