2-Amino-4-(2,4-dihydroxyphenyl) quinoline-3-carbonitrile as sustainable corrosion inhibitor for SAE 1006 steel in 1 M HCl: Electrochemical and surface investigation

Journal of the Association of Arab Universities for Basic and Applied Sciences Pub Date : 2017-06-01 DOI:10.1016/j.jaubas.2016.03.002

Chandrabhan Verma, M.A. Quraishi

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引用次数: 24

Abstract

The corrosion inhibition efficiency of 2-amino-4-(2,4-dihydroxyphenyl) quinoline-3-carbonitrile (ADQC) on SAE 1006 steel has been investigated using electrochemical (EIS and Polarization), surface (SEM, EDX and AFM) and quantum chemical calculation methods. Results showed that inhibition efficiency increases with increasing ADQC concentration and maximum value of 96.12% was obtained at 25 mg/L concentration. EIS results showed the ADQC inhibits SAE 1006 steel corrosion becoming the adsorbate at metal/electrolyte interfaces. Polarization study showed that ADQC acts as cathodic type inhibitor. SEM, EDX and AFM finding supported the adsorption of ADQC on the mild steel surface. The quantum chemical calculations provide good insight about the adsorption and inhibition mechanism of ADQC. The experimental and quantum chemical calculation results were in good agreement.

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2-氨基-4-(2,4-二羟基苯基)喹啉-3-碳腈作为SAE 1006钢在1m HCl中的缓蚀剂:电化学和表面研究

采用电化学(EIS和极化)、表面(SEM、EDX和AFM)和量子化学计算方法研究了2-氨基-4-(2,4-二羟基苯基)喹啉-3-碳腈(ADQC)对sae1006钢的缓蚀效果。结果表明，ADQC的抑菌率随浓度的增加而增加，在浓度为25 mg/L时抑菌率最高，为96.12%。EIS结果表明，ADQC抑制sae1006钢的腐蚀成为金属/电解质界面的吸附质。极化研究表明ADQC为阴极型抑制剂。SEM, EDX和AFM结果支持ADQC在低碳钢表面的吸附。量子化学计算为ADQC的吸附和抑制机理提供了良好的认识。实验结果与量子化学计算结果吻合较好。

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Journal of the Association of Arab Universities for Basic and Applied Sciences

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