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Insight into the corrosion inhibition property of Artocarpus heterophyllus Lam leaves extract
Jiahong He,Qiang Xu,Guoqiang Li,Qiang Li,Riadh Marzouki,Wenpo Li 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.102 No.-
In this work, the method (water extraction way) was uesd to acquire Artocarpus heterophyllus Lamleaves extract (AHLLE). We refer to the relevant references on the composition of Artocarpus heterophyllusLam leaves and perform Fourier infrared spectroscopy analysis for AHLLE. It can be concluded thatAHLLE contains 2-(2,4-dihydroxyphenyl)-5,7-dihydroxy-4H-chromen-4-one (DPD), (2R,3R)-2-(2,4-dihydroxyphenyl)-3 ,5,7-trihydroxychroman-4-one (DPT), 3-(4-hydroxyphenyl)acrylic acid (HPT), and5-(6-hydroxybenzofuran-2-yl)benzene-1,3-diol (HBB). Quantum chemical calculations (QCC) data andmolecular dynamics (MD) simulations results show that DPD, DPT, HPT, and HBB all have the potentialof excellent corrosion inhibitors. Scanning electron microscope (SEM) results and atomic force microscope(AFM) test results show that after adding AHLLE to H2SO4 environment, the copper surface is stillcorrespondingly flat. In addition, the results of electrochemical experiments indicate that the AHLLE is500 ppm, the anti-corrosion efficiency obtained from electrochemical impedance spectroscopy datacan reach 97.3%. With the temperature augments to 313 K, the corrosion inhibition nature of AHLLEcan still be maintained to 97%. AHLLE is adsorbed onto the Cu surface and belongs to Langmuir monolayeradsorption.
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Bochuan Tan,Shengtao Zhang,Wenpo Li,Xiuli Zuo,Yujie Qiang,Lihui Xu,Jiangyu Hao,Shijin Chen 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.77 No.-
Phenyl disulfide (PDF), 2,20-dithiodipyridine (DDP), 5,5-dithiobis(1-phenyl-1H-tetrazole) (DPT) werestudied as inhibitors for Cu in H2SO4 via electrochemical methods, surface morphology analysis andtheoretical calculations. Electrochemical experiments show that PDF, DDP and DPT can exhibit excellentcorrosion inhibition performance. Their order of corrosion inhibition is DPT > DDP > PDF. Surfacemorphology analysis supports the electrochemical results. The X-ray photoelectron spectroscopy (XPS)results show that S Cu bonds are detected in PDF, DDP and DPT, and N Cu bonds are detected in DDPand DPT. PDF, DDP and DPT adsorption on the Cu surface obey the Langmuir isotherm model. The resultsof quantum chemical calculations show that DPT has more active reaction sites than DDP and PDF. Molecular dynamics simulation results show that the order of binding energies of the three corrosioninhibitor molecules on the copper surface is DPT > DDP > PDF.
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