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Mechanism of corrosion protection in chloride solution by an apple-based green inhibitor: experimental and theoretical studies
Journal of Infrastructure Preservation and Resilience Pub Date : 2020-06-05 , DOI: 10.1186/s43065-020-00007-w
Mehdi Honarvar Nazari , Mehdi Salih Shihab , Eden Adele Havens , Xianming Shi

Preservation of metals in infrastructures and other assets requires cost-effective and sustainable solutions such as green corrosion inhibitors. This study assesses an apple pomace-derived green inhibitor synthesized by an innovative zero-waste method. Electrochemical measurements revealed the high performance of this liquid extract in reducing the corrosion of carbon steel in NaCl brine. The chemical composition of this inhibitor was characterized by liquid chromatography mass spectroscopy (LC-MS) to shed light on the corrosion inhibition mechanism. Based on LC-MS analysis, the results of surface analysis were interpreted. Specifically, the major corrosion inhibitor agent in the apple pomace extract was determined as C26H50NO7P (1-Linoleoyl-sn-glycero-3-phosphocholine), which can adsorb onto the steel surface to form a barrier layer and serve as a blocker of active anodic sites. Further study showed that the apple extract adsorption follows the Langmuir isotherm, and physical adsorption is dominant (vs. chemical adsorption). Theoretical calculations using quantum chemistry proposed a physisorption mechanism for the protection of steel by C26H50NO7P molecules.

中文翻译:

苹果基绿色缓蚀剂在氯化物溶液中的腐蚀防护机理:实验和理论研究

保护基础设施和其他资产中的金属需要经济有效且可持续的解决方案,例如绿色缓蚀剂。这项研究评估了通过创新的零废料方法合成的苹果渣衍生的绿色抑制剂。电化学测量表明,该液体提取物在减少碳钢在NaCl盐水中的腐蚀方面具有高性能。通过液相色谱质谱法(LC-MS)对该抑制剂的化学成分进行了表征,以阐明缓蚀机理。基于LC-MS分析,解释了表面分析的结果。具体来说,苹果渣提取物中的主要缓蚀剂被确定为C26H50NO7P(1-油烯基-sn-甘油-3-磷酸胆碱),可以吸附到钢表面形成阻挡层,并作为活性阳极位点的阻挡剂。进一步的研究表明,苹果提取物的吸附遵循Langmuir等温线,而物理吸附占主导(相对于化学吸附)。使用量子化学的理论计算提出了一种通过C26H50NO7P分子保护钢的物理吸附机制。
更新日期:2020-06-05
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