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Electrochemical and quantum chemical study of purines as corrosion inhibitors for mild steel in 1 M HCl solution
Yan, Ying1,2; Li, Weihua2; Cai, Lankun1; Hou, Baorong2
2008-08-20
Source PublicationELECTROCHIMICA ACTA
ISSN0013-4686
Volume53Issue:20Pages:5953-5960
SubtypeArticle
AbstractThe purines and its derivatives, such as, guanine, adenine, 2,6-diaminopurine, 6-thioguanine and 2,6-dithiopurine, were investigated as corrosion inhibitors for mild steel in 1 M HCl solution by weight loss measurements, electrochemical tests and quantum chemical calculations. The polarization curves of mild steel in the hydrochloric acid solutions of the purines showed that both cathodic and anodic processes of steel corrosion were suppressed. The Nyquist plots of impedance expressed mainly as a depressed capacitive loop with different compounds and concentrations. For all these purines, the inhibition efficiency increased by increasing the inhibitor concentration, and the inhibition efficiency orders are 2,6-dithiopurine > 6-thioguanine > 2,6-diaminopurine > adenine > guanine with the highest inhibiting efficiency of 88.0% for 10(-3) M 2,6-dithiopurine.; The purines and its derivatives, such as, guanine, adenine, 2,6-diaminopurine, 6-thioguanine and 2,6-dithiopurine, were investigated as corrosion inhibitors for mild steel in 1 M HCl solution by weight loss measurements, electrochemical tests and quantum chemical calculations. The polarization curves of mild steel in the hydrochloric acid solutions of the purines showed that both cathodic and anodic processes of steel corrosion were suppressed. The Nyquist plots of impedance expressed mainly as a depressed capacitive loop with different compounds and concentrations. For all these purines, the inhibition efficiency increased by increasing the inhibitor concentration, and the inhibition efficiency orders are 2,6-dithiopurine > 6-thioguanine > 2,6-diaminopurine > adenine > guanine with the highest inhibiting efficiency of 88.0% for 10(-3) M 2,6-dithiopurine. The optimized structures of purines, the Mulliken charges, molecular orbital densities and relevant parameters were calculated by quantum chemical calculations. The quantum chemical calculation results inferred that the adsorption belong to physical adsorption, which might arise from the pi stacking between the pi electron of the purines and the metal surface. (C) 2008 Elsevier Ltd. All rights reserved.
KeywordPurines Mild Steel Corrosion Inhibitor Electrochemical Measurement Quantum Chemical Calculation
Subject AreaElectrochemistry
DOI10.1016/j.electacta.2008.03.065
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Indexed BySCI
Language英语
WOS IDWOS:000257011400013
Citation statistics
Cited Times:222[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/5178
Collection海洋环境腐蚀与与生物污损重点实验室
Affiliation1.E China Univ Sci & Technol, Coll Resource & Environm Engn, Shanghai 200237, Peoples R China
2.Chinese Acad Sci, Inst Oceanol, Qingdao 26607, Peoples R China
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Yan, Ying,Li, Weihua,Cai, Lankun,et al. Electrochemical and quantum chemical study of purines as corrosion inhibitors for mild steel in 1 M HCl solution[J]. ELECTROCHIMICA ACTA,2008,53(20):5953-5960.
APA Yan, Ying,Li, Weihua,Cai, Lankun,&Hou, Baorong.(2008).Electrochemical and quantum chemical study of purines as corrosion inhibitors for mild steel in 1 M HCl solution.ELECTROCHIMICA ACTA,53(20),5953-5960.
MLA Yan, Ying,et al."Electrochemical and quantum chemical study of purines as corrosion inhibitors for mild steel in 1 M HCl solution".ELECTROCHIMICA ACTA 53.20(2008):5953-5960.
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