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Pterocarpus santalinoides leaves extract as a sustainable and potent inhibitor for low carbon steel in a simulated pickling medium
Sustainable Chemistry and Pharmacy ( IF 6 ) Pub Date : 2019-12-05 , DOI: 10.1016/j.scp.2019.100196
Cornelius C. Ahanotu , Ikenna B. Onyeachu , Moses M. Solomon , Ikechukwu S. Chikwe , Oluchukwu B. Chikwe , Chinenye A. Eziukwu

The crude extract of Pterocarpus santalinoides leaves (PSLE) extracted using water, ethanol, and methanol as the extraction solvent has been studied as inhibitor for low carbon steel in 1 moL/dm3 HCl solution using electrochemical approaches at 25 °C and 60 °C. The results obtained reveal that, PSLE extract has the capacity to effectively suppress the dissolution of the studied substrate. The inhibition performance of PSLE is a function of concentration, temperature, and extraction solvent. Corrosion inhibition is in the order: ethanolic extract > methanolic extract > aqueous extract. With 0.7 g/L PSLE, inhibition efficiency of >90% has been obtained at 60 °C. Based on calculated values of adsorption parameters and UV–vis results, it is proposed that PSLE molecules chemically interacted with the substrate surface. PSLE extract suppressed both the rate of cathodic and anodic reactions according to the PDP results. However, aqueous PSLE extract inhibited anodic corrosion reactions predominantly while ethanolic and methanolic extracts mainly inhibited the cathodic corrosion reactions. Surface characterization studies via SEM, EDAX, and AFM provide experimental evidence to the claim of interaction and presence of PSLE molecules on the studied substrate surface.



中文翻译:

紫檀叶提取物在模拟酸洗介质中作为低碳钢的可持续有效抑制剂

研究了以水,乙醇和甲醇为提取溶剂提取的紫檀叶粗提取物(PSLE)在1 moL / dm 3中作为低碳钢的抑制剂使用电化学方法在25°C和60°C下的HCl溶液。所得结果表明,PSLE提取物具有有效抑制所研究的底物溶解的能力。PSLE的抑制性能是浓度,温度和萃取溶剂的函数。腐蚀抑制的顺序为:乙醇提取物>甲醇提取物>水提取物。使用0.7 g / L PSLE,在60°C下获得的抑制效率> 90%。根据吸附参数和UV-vis结果的计算值,建议PSLE分子与底物表面发生化学相互作用。根据PDP结果,PSLE提取物可同时抑制阴极和阳极反应的速率。然而,PSLE水溶液提取物主要抑制阳极腐蚀反应,而乙醇和甲醇提取物则主要抑制阴极腐蚀反应。通过SEM,EDAX和AFM进行的表面表征研究为所研究的基材表面上PSLE分子相互作用和存在的说法提供了实验证据。

更新日期:2019-12-05
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