羟乙基纤维素在 3.5%氯化钠溶液中作为一种环保型抑制剂用于 1018 碳钢腐蚀。

Hydroxyethylcellulose used as an eco-friendly inhibitor for 1018 c-steel corrosion in 3.5% NaCl solution.

机构信息

Chemistry Department, Faculty of Science, Mansoura University, P.O. Box: 35516, Mansoura, Egypt.

出版信息

Carbohydr Polym. 2014 Nov 4;112:595-602. doi: 10.1016/j.carbpol.2014.06.032. Epub 2014 Jun 19.

DOI:10.1016/j.carbpol.2014.06.032

Abstract

The inhibition effect of hydroxyethylcellulose (HEC) on 1018 c-steel corrosion in 3.5% NaCl solution was investigated by using potentiodynamic polarization, electrochemical frequency modulation (EFM) and electrochemical impedance spectroscopy (EIS) techniques. The potentiodynamic polarization studies suggested that HEC acts as a mixed-type inhibitor. Data obtained from EIS were analyzed to model the corrosion inhibition process through equivalent circuit. Results obtained from EFM technique were shown to be in agreement with potentiodynamic and EIS techniques. The adsorption behavior of HEC on steel surface follows the Langmuir adsorption isotherm. Thermodynamic parameter (ΔG°(ads)) and activation parameters (Ea(), ΔH() and ΔS(*)) were calculated to investigate mechanism of inhibition. Scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analysis system were performed to characterize the film formed on the metal surface. DMol(3) quantum chemical calculations were performed to support the adsorption mechanism with the structure of HEC molecule.

摘要

采用动电位极化、电化学频率调制（EFM）和电化学阻抗谱（EIS）技术研究了羟乙基纤维素（HEC）在 3.5%NaCl 溶液中对 1018 碳钢腐蚀的抑制作用。动电位极化研究表明，HEC 作为一种混合型抑制剂。通过等效电路分析 EIS 数据来模拟腐蚀抑制过程。EFM 技术获得的结果与动电位和 EIS 技术一致。HEC 在钢表面的吸附行为遵循 Langmuir 吸附等温线。计算热力学参数（ΔG°(ads)）和活化参数（Ea(), ΔH()和ΔS(*)），以研究抑制机制。采用扫描电子显微镜（SEM）和能谱（EDX）分析系统对金属表面形成的膜进行了表征。采用 DMol(3)量子化学计算方法，用 HEC 分子的结构来支持吸附机制。