Adsorption and inhibitive impact of 5-[4-(dimethylamino) benzylidene]-1,3-dimethylbarbituric acid on carbon steel corrosion in molar hydrochloric acid solution

Zastita materijala Pub Date : 2022-01-01 DOI:10.5937/zasmat2203238a

El-Khalek Abdel, K. Shalabi, M. Ismail, E. Fouda

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Abstract

The inhibiting impact of ecofriendly 5-[4-(dimethylamino) benzylidene]-1,3-dimethylbarbituric acid in 1 M HCl on the corrosion for carbon steel has been examined via "weight loss (WL) method, potentiodynamic polarization (PP), electrochemical impedance spectroscopy (EIS), electrochemical frequency modulation (EFM) tests". The attained outcomes exhibit that the investigated compound is excellent inhibitor and its inhibition efficiency (%IE) rises by raising concentration and decreases by raising the temperature. The adsorption of 5-arylidene barbituric acid on the surface of C-steel follows Langmuir isotherm. The adsorption process of the investigated compound is spontaneous and considered as of chemisorption and physisorption type. PP curves revealed that the 5-arylidene barbituric acid derivative is mixed-type inhibitor. Moreover, EIS results confirmed the adsorption of the investigated compound on C-steel surface via increasing on charge transfer resistance (R ct). The IE% of this inhibitor reached to 86.9% at concentration 21×10-6 M according to PP method. Finally, the experimental and theoretical results are in good harmony.

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5-[4-(二甲氨基)苄基]-1,3-二甲基巴比妥酸在摩尔盐酸溶液中对碳钢腐蚀的吸附及抑制作用

采用“失重法(WL)、动电位极化(PP)、电化学阻抗谱(EIS)、电化学调频(EFM)试验”研究了生态友好型5-[4-(二甲氨基)苄基]-1,3-二甲基巴比妥酸在1 M盐酸中对碳钢腐蚀的抑制作用。结果表明，所研究的化合物是一种优良的缓蚀剂，其缓蚀效率(%IE)随浓度的升高而升高，随温度的升高而降低。5-芳烯基巴比妥酸在c钢表面的吸附遵循Langmuir等温线。所研究的化合物的吸附过程是自发的，被认为是化学吸附和物理吸附型。PP曲线显示5-芳烯基巴比妥酸衍生物为混合型抑制剂。此外，EIS结果证实了所研究的化合物通过增加电荷转移电阻(R ct)在c钢表面的吸附。用PP法测定，当浓度为21×10-6 M时，该抑制剂的IE%达到86.9%。最后，实验结果与理论结果很好地吻合。

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来源期刊

Zastita materijala Materials Science-General Materials Science

CiteScore

0.80

自引率

0.00%

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