CORROSION INHIBITION OF GLUTAMIC ACID SELF-ASSEMBLED MONOLAYERS ON COPPER

J Chin Soc Corr Pro

2011, Vol. 31

Issue (1): 56-61 DOI:

Research Articles

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CORROSION INHIBITION OF GLUTAMIC ACID SELF-ASSEMBLED MONOLAYERS ON COPPER

ZHANG Daquan, XIE Bin, LI Jin, HE Xianming, GAO Lixin

School of Thermal Power & Environmental Engineering,Shanghai University of Electric Power, Shanghai 200090

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Abstract Self-assembled monolayers (SAMs) of glutamic acid (Glu) were formed on copper surface. The influence of assembling time, Glu concentration and pH values on the protection of the Glu SAMs were examined by electrochemical impedance spectroscopy (EIS). It shows that the protective efficiency (PE) increased with an increase of self-assembling time and self-assembling concentration. The film assembled at 10 mmol/L concentration for 12 h possess the best protective effect. The optimal self-assembling pH is 10. The synergistic effect between iodide ion and Glu was studied by EIS and electrochemical polarization measurement. When iodide ion was added to the Glu-containing solution, the protection effect of the mixed SAMs improved significantly. The adsorption mechanism of the Glu on copper surface was discussed by AM1 quantum chemical calculations.

Key words: copper glutamic acid self-assembled monolayers protection synergistic effect

Received: 22 September 2009

ZTFLH:

TG174.2

Corresponding Authors: ZHANG Daquan E-mail: zhdq@sh163.net

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ZHANG Daquan, XIE Bin, LI Jin, HE Xianming, GAO Lixin. CORROSION INHIBITION OF GLUTAMIC ACID SELF-ASSEMBLED MONOLAYERS ON COPPER. J Chin Soc Corr Pro, 2011, 31(1): 56-61.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2011/V31/I1/56

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