Corrosion protection of Q235 steel in acidic-chloride media using seed extracts of Piper guineense
Corrosion protection of Q235 steel in acidic-chloride media using seed extracts of Piper guineense
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使用几内亚胡椒种子提取物对 Q235 钢在酸性氯化物介质中的腐蚀防护
DOI：
10.1016/j.molliq.2021.115619
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发表时间：
2021-02
影响因子：
6
通讯作者：
Li Ying
中科院分区：
文献类型：
--
作者：
Njoku Demian I;Njoku Chigoziri N.;Lgaz Hassane;Okafor Peter C.;Oguzie Emeka E.;Li Ying
采用一系列实验和计算技术，研究了胡椒种子提取物（PGS）作为一种环保且经济高效的防腐剂，在酸性氯化物介质（0.25 M H2SO 4 + 0.5 M NaCl）中对Q235碳钢的保护作用。采用GC-MS和FTIR分析相结合的方法对PGS种子提取物的化学成分进行了鉴定。腐蚀实验，包括重量和电化学测量，以及表面成像（AFM，SEM）和表征（XPS）技术都证实了显着的和可持续的防腐性能的PGS。的阻抗数据显示强的界面吸附的植物化学成分的PGS在钢表面上，而极化测量证实其同时抑制作用的腐蚀过程中的阴极和阳极反应。发现该提取物在不补充的情况下长时间间隔（长达144 h）保持其显着的防腐效率（> 98%）。萃取物组分在钢表面的表面覆盖度符合Langmuir吸附等温线模型。采用密度泛函理论（DFT）的背景下，使用分子动力学模拟计算的一些主要的植物化学成分的提取物对铁的吸附强度。计算的吸附能的大负值证实了从实验数据中观察到的PGS提取物的显着的防腐性能。
The seed extract ofPiper guineense(PGS) was investigated as an eco-friendly and cost-effective anticorrosion agent for the protection of Q235 carbon steel in acid chloride medium (0.25 M H2SO4+ 0.5 M NaCl), using a sequence of experimental and computational techniques. The phytochemical constituents of PGS seed extract were verified with a combination of GC–MS and FTIR analysis. Corrosion experiments involving gravimetric and electrochemical measurements, as well as surface imaging (AFM, SEM) and characterization (XPS) techniques all confirmed remarkable and sustainable anticorrosion performance of PGS. The impedance data revealed strong interfacial adsorption of phytochemical constituents of PGS on the steel surface, while polarization measurements confirmed their simultaneous inhibiting effects on both the cathodic and anodic reactions of the corrosion process. The extract was found to sustain its remarkable anticorrosion efficiency (> 98%) for prolonged time intervals (up to 144 h) without replenishment. The surface coverage of the extract constituents on the steel surface followed the Langmuir adsorption isotherm model. The adsorption strengths of some major phytochemical constituents of the extract on iron were computed using molecular dynamics simulations in the context of the density functional theory (DFT). The large negative values of the computed adsorption energies corroborate the remarkable anticorrosion performance of PGS extract as observed from the experimental data.
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影响因子：
1.2
作者：
M. Vinutha;T. V. Venkatesha
通讯作者：
M. Vinutha;T. V. Venkatesha
影响因子：
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作者：
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通讯作者：
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影响因子：
6.7
作者：
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通讯作者：
O. Olivares-Xometl;N. Likhanova;M. A. Domínguez-Aguilar;J. Hallen;L. Zamudio;E. Arce