Abstract
In the present study, a simple in situ hydrothermal method was used to fabricate Layered Double Hydroxide conversion coating at different treatment temperatures, times and pH values on the surface of AZ31 magnesium alloy. The films were characterized using XRD, FTIR, XPS, EDS and FESEM. The corrosion resistance of the coatings was evaluated by potentiodynamic polarization, electrochemical impedance spectroscopy and electrochemical noise techniques. The results confirmed the anion exchange ability of the LDH film. Moreover, the best results were obtained at 160 °C, 8 h and pH of 10. Dense and compact blade-like structures were obtained which exhibited appropriate corrosion resistance. The self-healing ability of the films was improved by increasing the LDH content of the film.
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