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Corrosion inhibitory effect of mixed cocoa pod-Ficus exasperata extract on MS in 1.5 M HCl: optimization and electrochemical study
Corrosion Reviews ( IF 2.7 ) Pub Date : 2021-04-01 , DOI: 10.1515/corrrev-2019-0077
Lekan Taofeek Popoola 1
Affiliation  

This paper investigated optimization of corrosion inhibitory attributes of mixed cocoa pod- Ficus exasperata (CP-FE) extracts towards mild steel in 1.5 M HCl using central composite design. Potentiodynamic polarization, linear polarization resistance and electrochemical impedance spectroscopy measurements were used for the electrochemical study. The result revealed maximum inhibition efficiency of 91.52% at temperature, inhibitor concentration, time and acid concentration of 50 °C, 5 g/L, 144 h and 0.2 M, respectively with R 2 value of 0.9429. Central composite design predicted optimum point of 70.37 °C, 3.81 g/L, 127.37 h and 0.22 M. Potentiodynamic polarization revealed extract to be mixed-type inhibitor with anodic prevalence. Electrochemical impedance spectroscopy showed that corrosion inhibition occurred via adsorption of CP-FE molecules on active sites of MS surface. Scanning electron microscopy images revealed protection of mild steel surface by adsorbed molecules of CP-FE extracts. Fourier transform infrared revealed presence of carboxyl (–COOH), unsaturated (–C-C–) and hydroxyl (–OH). Energy dispersive spectroscopy revealed presence of high iron composition on mild steel surface in the presence of mixed CP-FE extract proving its corrosion inhibition efficiency in 1.5 M HCl. Atomic adsorption spectroscopy revealed loss of Fe 2+ into free HCl solution. Generally, extract from mixed CP-FE was found as effective corrosion inhibitor for mild steel in 1.5 M HCl solution.

中文翻译:

混合可可荚榕榕提取物对1.5 M HCl中MS的腐蚀抑制作用:优化和电化学研究

本文采用中心复合设计方法,研究了可可豆荚-无花果混合提取物(CP-FE)对1.5 M HCl中低碳钢的缓蚀性能的优化。电位动力学极化,线性极化电阻和电化学阻抗谱测量用于电化学研究。结果表明,在温度,抑制剂浓度,时间和酸浓度分别为50°C,5 g / L,144 h和0.2 M时,最大抑制效率为91.52%,R 2值为0.9429。中央复合材料设计预测最佳点为70.37°C,3.81 g / L,127.37 h和0.22M。电位动力学极化显示提取物是具有阳极盛行性的混合型抑制剂。电化学阻抗谱表明,腐蚀抑制是通过CP-FE分子在MS表面活性位上的吸附而发生的。扫描电子显微镜图像显示,CP-FE提取物的吸附分子对低碳钢表面具有保护作用。傅立叶变换红外显示存在羧基(–COOH),不饱和(–CC–)和羟基(–OH)。能量色散光谱法表明,在混合CP-FE萃取物的存在下,低碳钢表面上存在高铁成分,证明了其在1.5 M HCl中的缓蚀效率。原子吸收光谱法表明,Fe 2+损失成游离HCl溶液。通常,从混合CP-FE中提取的提取物被发现是在1.5 M HCl溶液中对低碳钢有效的缓蚀剂。扫描电子显微镜图像显示,CP-FE提取物的吸附分子对低碳钢表面具有保护作用。傅立叶变换红外显示存在羧基(–COOH),不饱和(–CC–)和羟基(–OH)。能量色散光谱法表明,在混合CP-FE萃取物的存在下,低碳钢表面上存在高铁成分,证明了其在1.5 M HCl中的缓蚀效率。原子吸收光谱法表明,Fe 2+损失成游离HCl溶液。通常,从混合CP-FE中提取的提取物被发现是在1.5 M HCl溶液中对低碳钢有效的缓蚀剂。扫描电子显微镜图像显示,CP-FE提取物的吸附分子对低碳钢表面具有保护作用。傅立叶变换红外显示存在羧基(–COOH),不饱和(–CC–)和羟基(–OH)。能量色散光谱法表明,在混合CP-FE萃取物的存在下,低碳钢表面上存在高铁成分,证明了其在1.5 M HCl中的缓蚀效率。原子吸收光谱法表明,Fe 2+损失成游离HCl溶液。通常,从混合CP-FE中提取的提取物被发现是在1.5 M HCl溶液中对低碳钢有效的缓蚀剂。能量色散光谱法表明,在混合CP-FE萃取物的存在下,低碳钢表面上存在高铁成分,证明了其在1.5 M HCl中的缓蚀效率。原子吸收光谱法表明,Fe 2+损失成游离HCl溶液。通常,从混合CP-FE中提取的提取物被发现是在1.5 M HCl溶液中对低碳钢有效的缓蚀剂。能量色散光谱法表明,在混合CP-FE萃取物的存在下,低碳钢表面上存在高铁成分,证明了其在1.5 M HCl中的缓蚀效率。原子吸收光谱法表明,Fe 2+损失成游离HCl溶液。通常,从混合CP-FE中提取的提取物被发现是在1.5 M HCl溶液中对低碳钢有效的缓蚀剂。
更新日期:2021-04-05
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