Studies on the inhibition of aluminium corrosion by 2-acetylphenothiazine in chloroacetic acids

Bulletin of Electrochemistry Pub Date : 2003-12-01 DOI:10.1108/00035590310501576

E. Ebenso, P. Okafor, U. Ekpe

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引用次数: 42

Abstract

The inhibition of corrosion of aluminium in chloroacetic acids namely monochloroacetic acid (MCA), dichloroacetic acid (DCA) and trichloroacetic acid (TCA) solution using 2-acetylphenothiazine (2APTZ) at 303 K and 313 K at concentrations 1 x 10 - 3 M, 1 x 10 - 4 M, 7.5 x 10 - 5 M, 5 x 10 - 5 M and 1 x 10 - 5 M was studied using the weight loss and hydrogen evolution techniques. The order of % inhibition efficiency of 2APTZ in MCA is 1 x 10 - 3 M (60.24%) > 1 x 10 - 4 M (44.58%) > 7.5 x 10 M (35.54%) > 5 x 10 - 5 M (32.14%) > 1 x 10 - 5 M (27.71%) at 303 K. Similar trend was observed at 313 K and lower values were observed for DCA and TCA. 86.16% inhibition efficiency was obtained at the highest concentration studied using the hydrogen evolution technique. The two techniques used however reveal that 2APTZ inhibits corrosion reaction. The mechanism of physical adsorption is proposed from the obtained average. E a values of 76.05 KJmol - 1 for MCA, 70. 75 KJmol - 1 for DCA and and 68.52 KJmol - 1 for TCA. 2APTZ was also found to obey the Freundlish adsorption isotherm equation at the concentration studied. The two techniques employed revealed a first order kinetics.

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2-乙酰吩噻嗪在氯乙酸中缓蚀铝的研究

氯乙酸的抑制腐蚀的铝酸即一氯醋酸(MCA),二氯乙酸(DCA)和三氯乙酸(TCA)解决方案使用2-acetylphenothiazine (2 aptz)在303 K和313 K浓度1 x 10 - 3 M, 1 x 10 - 4 M, 7.5 x 10 - 5 M, 5 x 10 - 5 M和1 x 10 - 5 M使用减肥和氢进化技术进行了研究。2APTZ对MCA的抑制率依次为1 × 10 - 3 M(60.24%)、> 1 × 10 - 4 M(44.58%)、> 7.5 × 10 - M(35.54%)、> 5 × 10 - 5 M(32.14%)、> 1 × 10 - 5 M(27.71%)。在313 K时，DCA和TCA也有类似的变化趋势。在析氢技术研究的最高浓度下，抑氢率为86.16%。然而，两种技术表明2APTZ抑制腐蚀反应。根据所得平均值，提出了物理吸附机理。MCA的ea值为76.05 KJmol - 1。DCA为75 KJmol - 1, TCA为68.52 KJmol - 1。在所研究的浓度下，2APTZ也服从freundish吸附等温线方程。所采用的两种技术揭示了一级动力学。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Bulletin of Electrochemistry

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