Synergistic anticorrosion effect of Brassica Hirta phytoconstituents and cerium ions on mild steel in saline media: Surface and electrochemical evaluations

Abstract

Among all the issues that industries will encounter, corrosion is the most concerning. Up to now, corrosion left notable problems in industrial processes and that is why the researchers proposed various methods for limiting its drawbacks. The present work aim is to analyze the impact of Brassica Hirta extract, which is popularly called Mustard, on steel corrosion mitigation and its synergistic effect in mixture with cerium (Ce) cations by using electrochemical and morphological methods. One of the advantages of this inhibitor is its low cost, which is caused by the two factors of the water-based extraction process and the initial cost of the plant purchasing. Moreover, due to the mentioned extraction process, the ME can be considered an eco-friendly inhibitor. In addition, the ME is accessible in most parts of the world. The film composition screening was done by EDS, mapping, and GIXRD techniques, and by FE-SEM and AFM technics, both surface morphology investigation and topographical explorations were done.The findings confirm that the Mustard extract (ME) inhibition impact was boosted in the presence of Ce cations and the mixture performance was optimized at 200:600 ppm ME:Ce mixture concentration. The electrochemical impedance spectroscopy (EIS) and polarization records illustrated that the mixture could retard the corrosion by 94% and 92% of steel corrosion after 48 h of steel immersion, respectively. Also, the synergistic index value of 200:600 ppm ME:Ce ascended steadily from 2.50 until reaching 7.44. The morphology of the film deposited on the surface and its microstructure including ME:Ce complex was demonstrated. The GIXRD analysis outcomes besides EDS and mapping detections confirmed that the protective layer formed includes ME phytochemicals and Ce oxide/hydroxides.