INHIBITION PROPERTY AND ADSORPTION BEHAVIOR OF IMIDAZOLE AND 2—PHENYL—2—IMIDAZOLINE ON Cu IN H2SO4 SOLUTION

Acta Metall Sin

2013, Vol. 49

Issue (8): 1017-1024 DOI:

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INHIBITION PROPERTY AND ADSORPTION BEHAVIOR OF IMIDAZOLE AND 2—PHENYL—2—IMIDAZOLINE ON Cu IN H₂SO₄ SOLUTION

HE Xinkuai, HOU Bailong, JIANG Yumei, LI Chen, WU Luye

School of Packaging and Materials Engineering, Hunan University of Technology, Zhuzhou 412007

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HE Xinkuai, HOU Bailong, JIANG Yumei, LI Chen, WU Luye. INHIBITION PROPERTY AND ADSORPTION BEHAVIOR OF IMIDAZOLE AND 2—PHENYL—2—IMIDAZOLINE ON Cu IN H₂SO₄ SOLUTION. Acta Metall Sin, 2013, 49(8): 1017-1024.

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Abstract

Mass loss and electrochemical methods were carried out to evaluate the inhibition property and adsorption behavior of imidazole and 2-Phenyl-2-imidazoline for Cu in 5% H₂SO₄ solution. The results showed that the two compounds have obvious corrosion inhibition for Cu in H₂SO₄ solution, and the inhibition efficiency of 2-Phenyl-2-imidazoline was higher than that of imidazole. Meanwhile, the adsorption property was estimated using the activation energy E_a of the corrosion reaction, the standard adsorption Gibbs free energy change ΔG_m and enthalpy change ΔH_m for the imidazole and 2-phenyl-2-imidazoline, respectively. It revealed that the adsorption processes were exothermic reactions on Cu by a monolayer chemisorption--based mechanism, and the adsorption of the inhibitors followed the Langmuir adsorption isotherm. In addition, the differences of the monolayer adsorption structures between the imidazole and 2-Phenyl-2-imidazoline molecules on the Cu surface were investigated, and their inhibition mechanisms for Cu were analyzed.

Key words: 2-Phenyl-2-imidazoline Cu adsorption property inhibition mechanism

Received: 06 May 2013

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	HE Xinkuai
	HOU Bailong
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	LI Chen
	WU Luye

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2013/V49/I8/1017

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