Corrosion inhibition of carbon steel and antibacterial properties of aminotris-(methylenephosphonic) acid
Corrosion inhibition of carbon steel and antibacterial properties of aminotris-(methylenephosphonic) acid
复制标题
DOI：
10.1016/j.matchemphys.2009.09.006
复制
发表时间：
2010-01-15
影响因子：
4.6
通讯作者：
Jama, Charafeddine
中科院分区：
文献类型：
--
作者：
Labjar, Najoua;Lebrini, Mounim;Jama, Charafeddine
研究了氨基三亚甲基膦酸（ATMP）的缓蚀性能和抗菌性能。采用失重法对ATMP在1 M HCl溶液中作为碳钢缓蚀剂进行了评价。动电位极化和电化学阻抗谱（EIS）技术。实验结果表明，缓蚀剂浓度越大，缓蚀效率越高。Tafel极化研究表明，ATMP作为一种混合抑制剂。从EIS测量获得的数据进行了分析，通过适当的等效电路模型建模的腐蚀抑制过程。ATMP在碳钢表面的吸附符合Langmuir吸附等温式。计算的Δ G（ads）值表明，碳钢在1 M HCl中的缓蚀作用主要受物理吸附过程控制。此外，还利用交流阻抗技术研究了浸泡时间对碳钢腐蚀的影响。探讨了ATMP的缓蚀机理。该抑制剂也可用作水性环境中的杀生物剂。结果表明，ATMP对革兰氏阳性菌和革兰氏阴性菌均有抗菌作用。荧光假单胞菌的最低MIC（0.2 mg l（-1）），而大肠杆菌的最高MIC（3.1 mg l（-1））。在pH6.5的缓冲液中，ATMP对无害李斯特菌的MIC约为0.05。4-比在无缓冲培养基中测量的MIC高一倍。因此，我们的研究结果表明，ATMP的抗菌活性是pH溶液和所用膦酸酯分子的化学性质的综合作用的结果。(C)2009爱思唯尔有限公司版权所有。
In this work, the corrosion inhibition property and the antibacterial activity of the aminotris(methylenephosphonic) acid (ATMP) have been studied. ATMP has been evaluated as a corrosion inhibitor for carbon steel in 1 M HCl solution using weight loss. potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. According to the experimental results, the inhibition efficiency increased with increasing inhibitor concentration. Tafel polarization study showed that the ATMP acts as a mixed inhibitor. Data, obtained from EIS measurements, were analyzed to model the corrosion inhibition process through appropriate equivalent circuit models. Adsorption of ATMP on the carbon steel surface obeyed the Langmuir adsorption isotherm. The calculated Delta G(ads) value showed that the corrosion inhibition of the carbon steel in 1 M HCl is mainly controlled by a physisorption process. In addition, the effect of immersion time on the corrosion of carbon steel was also studied in this work using ac impedance technique. The corrosion inhibition mechanism of ATMP was discussed. This inhibitor can be also used as biocide in aqueous environments. Our results showed that ATMP have an antibacterial effect against both Gram positive and Gram negative bacteria. The lowest MIC (0.2 mg l(-1)) was measured for Pseudomonas fluorescens while the highest MIC was measured for Escherichia coli (3.1 mg l(-1)). In addition, the results showed that the MIC of ATMP against Listeria innocua in a buffered medium (pH 6.5) was of ca. 4-fold higher than MIC measured in unbuffered medium. Thus, our findings showed that the antibacterial activity of ATMP is a result of a combined effect of the pH solution and the chemical nature of the used phosphonate molecule. (C) 2009 Elsevier B.V. All rights reserved.