Insights into the inhibition mechanism of a novel supramolecular complex towards the corrosion of mild steel in the condensate water: experimental and theoretical studies

Autor:	Yun Li, Hua Hao, Biao Yang, Bao Min Fan
Rok vydání:	2018
Předmět:	Auger electron spectroscopy Materials science Langmuir adsorption model 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Dielectric spectroscopy symbols.namesake Adsorption Chemisorption symbols Physical chemistry Molecule 0210 nano-technology Polarization (electrochemistry) Mulliken population analysis
Zdroj:	Research on Chemical Intermediates. 44:5711-5736
ISSN:	1568-5675 0922-6168
DOI:	10.1007/s11164-018-3451-8
Popis:	A supramolecular complex (HPDA) based on (2-hydroxypropyl)-β-cyclodextrin (HP-β-CD) and octadecylamine (ODA) exhibited a favourable inhibiting effect on the corrosion of mild steel (MS) in the condensate water. The structural properties of HPDA, including the apparent association constant (κ) and the optimal spatial configuration, were clarified using phase solubility simulation and molecular mechanics calculations. The results indicated that HPDA was fairly stable in water with a κ value of 9199 mol−1, and its four possible configurations might coexist. The corrosion inhibition effect of HPDA was collectively evaluated by both experimental and theoretical methods. Weight loss measurements showed that the inhibition efficiency of HPDA depended on the concentration and temperature, and the maximum value could reach 92.6% with 50 mg L−1 concentration at 313 K. The potentiodynamic polarization tests showed that HPDA was a mixed type inhibitor with a predominantly anodic type. Also, the polarization resistance was effectively enhanced in the presence of HPDA according to the results of electrochemical impedance spectroscopy. Adsorption experiments revealed that HPDA inhibited the corrosion of MS by a chemisorption mechanism, which was well described by the Langmuir model. Surface analyses based on X-ray photoelectron spectroscopy and Auger electron spectroscopy disclosed that the chemisorption of HPDA on the MS surface resulted from the self-assembly of guest molecules (ODA) with a tilted orientation. In addition, an apparent connection was ascertained between the adsorption measurements and the theoretical parameters (Mulliken charges and molecular electrostatic potential plot) using quantum chemical calculations.
Databáze:	OpenAIRE
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