ABSTRACT

This study shows the inhibitory activity of the hexane, acetone and methanol extracts of Brugmansia arborea (B. arborea) during the corrosion of 1018 steel in 0.5 M of H₂SO₄. This was carried out by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization curves (PDP) techniques. The maximum efficiency for the three extracts was registered with 400 and 500 ppm concentrations, obtaining 98% by EIS and 80% by PDP. Through PDP, an inhibition behavior of the cathodic type was determined. During the residence time test, B. arborea reached a maximum inhibition efficiency of 98% at 24 h with acetone extract and at 20 h with methanol extract. The compound's chemical structure present in B. arborea was analyzed by the Fourier Transform infrared spectroscopy technique, and the presence of functional groups such as the amines was observed. The reason why an inhibitory activity is attributed to these compounds is because they contain nitrogen that may easily form complexes that are strongly adsorbed creating a thin layer on the metallic surface.

摘要

这项研究表明，Brugmansia arborea（B. arborea）的己烷，丙酮和甲醇提取物在1018钢在0.5 M H ₂ SO _4中腐蚀期间具有抑制作用。这是通过电化学阻抗谱（EIS）和电势极化曲线（PDP）技术进行的。三种提取物的最大效率分别记录在400和500 ppm浓度下，通过EIS获得98％，通过PDP获得80％。通过PDP，确定了阴极类型的抑制行为。在停留时间测试中，在提取丙酮的24 h和在提取甲醇的20 h时，树型芽孢杆菌均达到98％的最大抑制效率。该化合物的化学结构存在于通过傅立叶变换红外光谱技术分析了棉铃虫（B. arborea），并观察到官能团如胺的存在。抑制活性归因于这些化合物的原因是因为它们含有氮，氮容易形成强烈吸附的配合物，从而在金属表面形成薄层。