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Portulaca grandiflora as new green corrosion inhibitor for mild steel protection in hydrochloric acid: Quantitative, electrochemical, surface and spectroscopic investigations
Surfaces and Interfaces ( IF 6.2 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.surfin.2020.100595
Ahmed A. Fadhil , Anees A. Khadom , Salima K. Ahmed , Hongfang Liu , Chaoyang Fu , Hameed B. Mahood

Abstract The inhibition action of the Portulaca grandiflora leaf (PGL) extract against corrosion on N80 carbon steel was tested under 0.5 M HCl acidic conditions at variable temperatures and inhibitor concentrations. The performance behaviour of PGL was evaluated by weight loss and electrochemical techniques including polarisation measurement, open circuit potential, and electrochemical impedance spectroscopy. The analysis results of Fourier transform infrared spectroscopy, ultraviolet spectra, and surface morphology strongly support the corrosion rates results. The obtained outcomes show that the inhibitor can effectively inhibit the corrosion of carbon steel in acidic media with a maximum inhibition efficiency of 95% at high levels of temperature (60 °C) and inhibitor concentration (20 mL/L). The adsorption of PGL on the steel surface followed that according to the Langmuir isotherm model. The heat of adsorption values increased from -17.71 kJ mol-1 to -22.03 kJ mol-1 as the temperature increased from 30 to 60°C suggests a mixed-mode of adsorption on the metal surface.

中文翻译:

马齿苋作为新型绿色缓蚀剂,用于盐酸中低碳钢的保护:定量、电化学、表面和光谱研究

摘要 在 0.5 M HCl 酸性条件下,在不同温度和抑制剂浓度下,测试了马齿苋叶 (PGL) 提取物对 N80 碳钢腐蚀的抑制作用。PGL 的性能通过失重和电化学技术进行评估,包括极化测量、开路电位和电化学阻抗谱。傅里叶变换红外光谱、紫外光谱和表面形貌的分析结果强烈支持腐蚀速率结果。所得结果表明,缓蚀剂能有效抑制碳钢在酸性介质中的腐蚀,在高温(60℃)和缓蚀剂浓度(20 mL/L)下,最大缓蚀效率可达 95%。PGL在钢表面的吸附遵循Langmuir等温线模型。随着温度从 30°C 增加到 60°C,吸附热值从 -17.71 kJ mol-1 增加到 -22.03 kJ mol-1,表明金属表面上存在混合吸附模式。
更新日期:2020-09-01
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