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标题：Role of Citrate Ions in the Phosphonate-based Inhibitor System for Mild Steel in Aqueous Chloride Media
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作者：G. Gunasekaran ; B.I. Dubey ; J. Rangarajan 等
期刊名称：Defence Science Journal
印刷版ISSN：0976-464X
出版年度：2005
卷号：55
期号：1
页码：51-62
DOI：10.14429/dsj.55.1961
语种：English
出版社：Defence Scientific Information & Documentation Centre
摘要：The corrosion inhibition efficiency of phosphonic acid and its derivatives for the inhibition of corrosion of mild steel in neutral chloride media is decided by its ability to form protective film over the surface. In this context, the effect of addition of metal cations and certain organic compounds, such as citrate in conjugation with phosphonic acid to impart synergistic corrosion inhibition has been explored. The experiments were carried out using various concentrations of trisodium citrate and zinc ions in an aqueous solution of 2-carboxyethyl phosphonic acid (2CEPA) at 25 ppm. The corrosion characteristics have been determined using electrochemical impedance spectroscopy together with determination of corrosion rate by weight-loss method. It has been observed that a combination of inhibitive ions, namely citrate, ZCEPA, and zinc ions at 25 ppm gives 96 per cent inhibition efficiency and this corrosion inhibition is due to the formation of a protective film. By increasing the concentration of citrate beyond 25 ppm, the corrosion inhibition efficiency decreases. This paper discusses the role of citrate and zinc ions in imparting added corrosion inhibition ability using 2CEPA on the basis of experimental results.
关键词：Corrosion inhibition, phosphonic acid, surface coating, corrosion inhibitors, trlsodium citrate, electrochemical inhibition spectroscopy, EIS, 2CEPA. weight-loss method, 2-carboxyethyl phosphonic acid