腐蚀
介电谱
溶解
缓蚀剂
材料科学
扫描电子显微镜
电化学
金属
柠檬酸
极化(电化学)
表面粗糙度
核化学
冶金
化学工程
化学
复合材料
电极
有机化学
物理化学
工程类
作者
G. K. Shamnamol,Sam John,Jaya Mary Jacob
出处
期刊:Anti-corrosion Methods and Materials
[Emerald (MCB UP)]
日期:2022-07-13
卷期号:69 (5): 540-549
被引量:5
标识
DOI:10.1108/acmm-03-2022-2630
摘要
Purpose Surface pretreatment of iron and its alloys to remove stains and inorganic contaminants on the metal surface undergoes dissolution by virtue of the strong acidic media thereby increasing its susceptibility to corrosion. The purpose of this study is to explore the corrosion mitigation prospects of green corrosion inhibitors on mild steel surface. Design/methodology/approach Corrosion inhibition performance of Garcinia gummi-gutta leaf extract (GGLE) was explored against mild steel in 1 M HCl solution using the weight-loss method, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) techniques. Surface characterization was carried out to study the mechanism of inhibitor action. Findings The concentration of GGLE varied from 100 to 6,000 ppm and the result indicates that corrosion inhibition efficiency was amplified by raising the inhibitor concentration. The maximum inhibition efficiency was 82.2% at 6,000 ppm concentration. EIS results show the development of a protective layer of inhibitor molecule over the metal surface and PDP demonstrates that the inhibitor operates as a mixed-type inhibitor. Scanning electron microscopy and atomic force microscopy were executed to assess the surface morphology and roughness, respectively. Originality/value To the best of the authors’ knowledge, so far, no studies have been reported on the corrosion inhibition performance of GGLE which is rich in many bioactive components especially hydroxyl citric acid. This work encompasses the corrosion inhibition capability of GGLE against mild steel in an acidic medium.
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