Evaluation of MgAl LDH incorporated Gallic acid anti-corrosion impact on mild steel in tempered 3.5% NaCl solutions: Integrated electrochemical and morphological studies

다국어 초록 (Multilingual Abstract)

Undoubtedly, high temperature is one of the most risk factors that aggravate corrosion, which can greatlyaffect the lifespan of metal substrates. Hence, high temperature corrosion control now become one of theexciting research hotspot for researchers. For corrosion prevention, the application of corrosion inhibitorsis one of the easy and practical ways and with the emergence of nanomaterials, smart inhibitors has beenremarked as a milestone in corrosion science. In this study, layered double hydroxide (LDH) nano-carrierencapsulated gallic acid (GA) was applied to control steel corrosion in high temperature 3.5% NaCl salineenvironment. The structural evaluation of this nanocomposite has been done with the help of X-raydiffraction (XRD), Fourier transform infrared (FTIR) and Brunauer-Emmett-Teller (BET) tests and theresults have confirmed the successful synthesis of this nanocomposite. Then, polarization test predictedthe inhibition mechanism and the results shown the mixed inhibition is responsible for 68% and 60% ofcorrosion controlled in 35 and 45 environment, respectively. But in order to better evaluation, the performanceof the nanocomposite has been checked via electrochemical impedance spectroscopy (EIS)evaluations. Based on the studies, it has been found that high temperature has severely limited the performanceof the pristine GA, but LDH/GA nanocomposite has been able to achieve 72% efficiency at 35 Cand 58% efficiency at 45 C. Finally, Field emission scanning electron microscopy (FE-SEM) captures aidedto assess the morphology of immersed surfaces at different temperatures and Energy Dispersive X-RayAnalysis (EDX)/MAP tests estimated the elemental structure of the samples.