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首页> 外文期刊>International Journal of Electrochemical Science >A Study of the Surface Protective Layer Formed on Carbon Steel in Water-Dioxane Solution Containing 0.15 M NaCl in Presence of an azo Dye with Antimicrobial Activity
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A Study of the Surface Protective Layer Formed on Carbon Steel in Water-Dioxane Solution Containing 0.15 M NaCl in Presence of an azo Dye with Antimicrobial Activity

机译：在具有抗菌活性的偶氮染料存在下，碳钢在含0.15 M NaCl的二恶烷水溶液中形成的表面保护层的研究

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In this study we present an azoether dye, 4-[(4-chlorobenzyl)oxy]-4chloro-3,5-dimethyl-azobenzene(CDAB), obtained by condensation of 4-chloromethyl chlorobenzene with 4-(4-chloro-phenylazo)-2,6- dimethyl-phenol using the Williamson etherification method, as a new inhibitor for corrosion ofcarbon steel in solution of 0.15 M NaCl/water/dioxane (WDS). Succesive electrochemicalmeasurements such as: potentiodinamic polarization, general corrosion and electrochemical impedancespectroscopy (EIS) were performed, in order to study the contribution of CDAB to the formation of theprotective layer on the surface of carbon steel in WDS. The CDAB electrochemical instability andthe adsorption of its molecules on carbon steel surface were discussed according to the data obtainedfrom UV-Vis spectrophotometry and from Temkin adsorption isotherm. By corroborating all the data,we assume that the formation of the protective layer on the surface of carbon steel corroded in WDScontaining CDAB is attributed to a synergistic contribution resulting from: the pure adsorption ofCDAB inhibitor; the 渂ridged chlorideformation between CDAB molecules and carbon steel surface;the pure adsorption of other organic compounds resulting from the CDAB electrochemicaldecomposition such as 2,6-dimethyl-benzoquinone and chlorbenzene; the dioxane adsorption that canenhance the action of CDAB as a corrosion inhibitor for carbon steel in WDS. The adsorption ofCDAB on carbon steel surface is the primordial process that prevails other processes and it wasmanifested even during the electrode prepolarization at open circuit. The optical microscopy imagesattest a different surface morphology for the carbon steel corroded in WDS dealt with CDABcompared to that shown in the absence of CDAB.
机译：在这项研究中，我们提出了一种偶氮醚染料4-[（4-氯苄基）氧基] -4氯-3,5-二甲基-偶氮苯（CDAB），该染料是通过将4-氯甲基氯苯与4-（4-氯-苯基偶氮）缩合而获得的）-2,6-二甲基苯酚（使用Williamson醚化方法）作为0.15 M NaCl /水/二恶烷（WDS）溶液中碳钢腐蚀的新抑制剂。为了研究CDAB对WDS中碳钢表面保护层形成的贡献，进行了诸如电化学电位极化，一般腐蚀和电化学阻抗谱（EIS）的连续电化学测量。根据UV-Vis分光光度法和Temkin吸附等温线获得的数据，讨论了CDAB的电化学不稳定性及其分子在碳钢表面上的吸附。通过证实所有数据，我们假定在含CDDS的WDS中腐蚀的碳钢表面上形成的保护层归因于以下方面的协同作用：CDAB抑制剂的纯吸附; CDAB分子与碳钢表面之间的渂状氯离子形成; CDAB电化学分解产生的其他有机化合物的纯吸附，例如2,6-二甲基-苯醌和氯苯;二恶烷吸附，可增强CDAB作为WDS中碳钢腐蚀抑制剂的作用。碳钢表面上CDAB的吸附是主要过程，是其他过程中最主要的过程，甚至在开路电极预极化过程中也表现出来。光学显微镜图像证明，与不存在CDAB的情况相比，用CDAB处理的WDS中腐蚀的碳钢具有不同的表面形态。

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