Influence of phytic acid on the corrosion behavior of iron under acidic and neutral conditions
Influence of phytic acid on the corrosion behavior of iron under acidic and neutral conditions
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酸性和中性条件下植酸对铁腐蚀行为的影响
DOI：
10.1016/j.electacta.2014.09.160
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发表时间：
2014-12-20
影响因子：
6.6
通讯作者：
Ma, Houyi
中科院分区：
文献类型：
--
作者：
Gao, Xiang;Zhao, Caicai;Ma, Houyi
采用电化学阻抗谱（EIS）和极化曲线法研究了植酸（PA）在酸性和中性条件下对铁腐蚀的影响。电化学研究结果表明，PA在H2SO 4溶液中作为混合型缓蚀剂能有效地抑制铁的腐蚀;而在Na 2SO 4溶液中，PA倾向于与溶解的Fe（II）离子反应，形成稳定的金属螯合物，在铁表面具有较强的阳极缓蚀作用。傅里叶变换红外光谱（FTIR）分析证实了铁基底上PA或其盐的存在。X射线光电子能谱（XPS）表征表明，酸性条件下植酸主要以未解离的分子形式吸附在铁表面，中性条件下植酸离子通过C-O-P键与铁表面氧化态结合。PA与铁基体之间的结合方式存在很大差异，这使得PA在不同条件下既可以作为缓蚀剂，也可以作为成膜剂。(C)2014爱思唯尔有限公司版权所有。
The influence of phytic acid (PA) on the corrosion of iron under acidic and neutral conditions was investigated by means of Electrochemical Impedance Spectroscopy (EIS) and polarization curve methods. The electrochemical results indicate that, PA can effectively inhibit the corrosion of iron as a mixed type inhibitor in H2SO4 solution; however, PA tends to react with the dissolved Fe (II) ions, forming stable metal chelate complexes with strong anodic inhibition action on the iron surface, in Na2SO4 solution. Fourier Transform Infrared Spectroscopic (FTIR) analysis confirms the existence of PA or its salts on the iron substrates. X-ray Photoelectron Spectroscopic (XPS) characterization demonstrates that PA adsorbs on the iron surface mainly in the form of undissociated molecules under acidic condition, while phytate ions may bind to the iron substrate through connection of C-O-P bond with oxidized iron surface under neutral condition. The great difference in binding mode between PA and the iron substrate makes PA act as either a corrosion inhibitor or a film former under different conditions. (C) 2014 Elsevier Ltd. All rights reserved.