In situ growth of corrosion resistant Mg-Fe layered double hydroxide film on Q235 steel

Hypothesis: In situ grown layered double hydroxide (LDH) is commonly used one of the anticorrosion ways for metal materials; Due to the dense growth of LDH on the metal surface, its special layered structure can effectively delay the corrosion rate of metal. Methods: In this study, we use a hydrothermal method to successfully grow Mg-Fe LDH film on steel substrates based on self-supplied Fe3+ ions. The films were characterized by X-ray diffraction, scanning electron microscopy, and X-ray energy dispersive spectrometry. The potential corrosion resistance of the obtained Mg-Fe LDH film was confirmed using electrochemical impedance spectroscopy and polarization curves. Findings: After systematic adjustment and parameter optimization, it was found that Mg-Fe LDH film exhibited the best growth morphology and comprehensive performance with an initial pH value of 10, Mg2+/urea ratio of 1:4 and reaction time of 12 h. The SEM and electrochemical results further demonstrated that Mg-Fe LDH film play a good protection effect on carbon steel surface. This study provides an important reference for the processing of anticorrosion LDHs film. (C) 2021 Elsevier Inc. All rights reserved.

Automated summary

In this study, Mg-Fe LDH film was successfully grown on steel substrates using a hydrothermal method, with the optimal growth conditions as an initial pH value of 10, Mg2+/urea ratio of 1:4, and a reaction time of 12 hours. Characterization techniques including X-ray diffraction, scanning electron microscopy, and electrochemical impedance spectroscopy confirmed the excellent corrosion resistance properties of the Mg-Fe LDH film.