Corrosion Inhibition of Iron in Acidic Solutions by Monoalkyl Phosphate Esters with Different Chain Lengths

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• 作者：Xiang Gao ; Shaotong Liu ; Haifeng Lu ; Feng Gao ; Houyi Ma
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2015
• 出版时间：February 25, 2015
• 年：2015
• 卷：54
• 期：7
• 页码：1941-1952
• 全文大小：638K
• ISSN：1520-5045

文摘

The inhibition effect of three amphiphilic monoalkyl phosphate esters with different chain lengths鈥攎ono-n-butyl phosphate ester (BP), mono-n-hexyl phosphate ester (HP), and mono-n-octyl phosphate ester (OP)鈥攐n the corrosion of iron in 0.5 M H₂SO₄ solutions was investigated by using electrochemical impedance spectroscopy (EIS) and polarization curve methods. The electrochemical results indicate that BP, HP, and OP all acted as mixed-type corrosion inhibitors with a dominant cathodic effect. BP shows the lowest inhibition efficiency as compared to HP or OP. However, the inhibition efficiency of HP is almost the same with that of OP under similar conditions because the molecular aggregation state at the iron/solution interface plays a more important role. X-ray photoelectron spectroscopic (XPS) characterization demonstrates that three alkyl phosphate esters adsorbed on the iron surface through the un-ionized P鈥揙H groups. The adsorption of BP, HP, and OP fitted well with the Langmuir model.