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Evaluation of endemic Chilean plant‐based Chañar extract (Geoffroea decorticans) as an inhibitor of corrosion for A36 steel under a saline environment
Materials and Corrosion ( IF 1.6 ) Pub Date : 2020-09-29 , DOI: 10.1002/maco.202011952
Andrés Díaz‐Gómez 1 , Rosa Vera 1 , Alexandra Chacón 1 , Luis F. Aguilar 2
Affiliation  

The use of inhibitors is one of the most practical modern methods in preventing and protecting against metal and alloy pipe corrosion. Exploring such additional inhibitors, particularly of natural origins, has become a key area of research. The present work, thus, evaluates the extract of a desert plant fruit, endemic to northern Chile, called Chañar (Geoffroea decorticans), as an inhibitor for the corrosion of A36 steel under a saline environment. Extract inhibition efficiency was evaluated by mass loss, polarization curves, and electrochemical impedance spectroscopy, and surface morphology of the steel after assays was analyzed by scanning electron microscopy. Results showed the formation of a smooth surface on the steel in the presence of the extract and a rough surface in the absence of the extract; also, polarization curves indicated an inhibition efficiency of approximately 82% at a concentration of 200ppm extract, corroborated by electrochemical impedance spectroscopy. The adsorption of the extract on the steel surface follows Langmuir's isotherm model, for which thermodynamic parameters suggest a physisorption mechanism.

中文翻译:

在盐渍环境下评估智利特有的植物提取的Chañar提取物(Geoffroea decorticans)作为A36钢的腐蚀抑制剂

抑制剂的使用是预防和防止金属和合金管道腐蚀的最实用的现代方法之一。探索这种额外的抑制剂,特别是天然来源的抑制剂已成为研究的关键领域。因此,本工作评估了智利北部特有的一种沙漠植物果实的提取物,称为ChañarGeoffroea decorticans),作为盐渍环境下A36钢腐蚀的抑制剂。通过质量损失,极化曲线和电化学阻抗谱评价提取物抑制效率,并通过扫描电子显微镜分析测定后的钢的表面形态。结果表明,在存在萃取物的情况下,在钢上形成光滑的表面,而在不存在萃取物的情况下,在钢表面上形成粗糙的表面。另外,极化曲线表明在200ppm提取物浓度下的抑制效率约为82%,这通过电化学阻抗谱得到了证实。提取物在钢表面的吸附遵循Langmuir等温线模型,该模型的热力学参数表明了其物理吸附机理。
更新日期:2020-09-29
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