当前位置：
X-MOL 学术
›
Mater. Corros.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Evaluation of Eulychnia acida and Echinopsis chiloensis (Cactaceae) extracts in inhibiting corrosion of carbon steel in HCl solution
Materials and Corrosion ( IF 1.6 ) Pub Date : 2019-11-19 , DOI: 10.1002/maco.201911274 Francisco Figueredo 1 , Rosa Vera 1 , Aurora Molinari 1
Materials and Corrosion ( IF 1.6 ) Pub Date : 2019-11-19 , DOI: 10.1002/maco.201911274 Francisco Figueredo 1 , Rosa Vera 1 , Aurora Molinari 1
Affiliation
|
In the present study, the activity of extracts obtained from the stems of two endemic species of the central–northern region of Chile (Eulychnia acida [Copao] and Echinopsis chiloensis [Quisco]), was evaluated as potential corrosion inhibitors for carbon steel in 0.1 M HCl. The total content of phenols and flavonoids in the extracts was determined, and the main components were identified by high‐performance liquid chromatography–mass spectrometry, being similar in both species. The inhibition efficiency of extracts was evaluated by mass loss measures, Tafel polarization curves, and electrochemical impedance spectroscopy. The assay results showed similar values in inhibition percentages, around 88% at extract concentrations of 1,500 ppm. The adsorption on the steel surface followed the Langmuir model adsorption isotherm, whose thermodynamic parameters (ΔG°ads for Copao and Quisco, −17.81 and −17.70 kJ/mol, respectively) suggest a physisorption mechanism. The scanning electron microscopy analyses showed that in the presence of the extracts, the surface of the steel is covered by a thin film that allows the sanding marks to be visualized; while without the extracts the surface is rough due to the HCl corrosion effect.
中文翻译：
盐酸大戟和仙人掌提取物在盐酸溶液中抑制碳钢腐蚀的评价
在本研究中，从智利中北部地区的两个特有物种（酸枝（Eulychnia acida [Copao]）和E（Echinopsis chiloensis）的茎中获得的提取物的活性被评估为碳钢在0.1 M HCl中的潜在腐蚀抑制剂。确定了提取物中酚和类黄酮的总含量，并通过高效液相色谱-质谱法鉴定了主要成分，这两个物种相似。提取物的抑制效率通过质量损失测量，Tafel极化曲线和电化学阻抗谱进行评估。测定结果显示出相似的抑制百分率值，提取物浓度为1,500 ppm时约为88％。钢表面的吸附遵循Langmuir模型的吸附等温线，其热力学参数（ΔG ° ad对于Copao和Quisco，分别为-17.81和-17.70 kJ / mol提出了一种物理吸附机制。扫描电子显微镜分析表明，在存在提取物的情况下，钢的表面覆盖有一层薄膜，该薄膜可以使磨砂痕迹可视化。没有提取物时，由于HCl腐蚀作用，表面粗糙。
更新日期：2019-11-19
中文翻译：
盐酸大戟和仙人掌提取物在盐酸溶液中抑制碳钢腐蚀的评价
在本研究中，从智利中北部地区的两个特有物种（酸枝（Eulychnia acida [Copao]）和E（Echinopsis chiloensis）的茎中获得的提取物的活性被评估为碳钢在0.1 M HCl中的潜在腐蚀抑制剂。确定了提取物中酚和类黄酮的总含量，并通过高效液相色谱-质谱法鉴定了主要成分，这两个物种相似。提取物的抑制效率通过质量损失测量，Tafel极化曲线和电化学阻抗谱进行评估。测定结果显示出相似的抑制百分率值，提取物浓度为1,500 ppm时约为88％。钢表面的吸附遵循Langmuir模型的吸附等温线，其热力学参数（ΔG ° ad对于Copao和Quisco，分别为-17.81和-17.70 kJ / mol提出了一种物理吸附机制。扫描电子显微镜分析表明，在存在提取物的情况下，钢的表面覆盖有一层薄膜，该薄膜可以使磨砂痕迹可视化。没有提取物时，由于HCl腐蚀作用，表面粗糙。
京公网安备 11010802027423号