LI Ruihong1 ,2 * ，SONG Yancheng1 , ZHANG Xinfang1 , WANG Tianfeng1 , LI Tong1 , HE Xyu1 , WANG Haiyan1 ,2 ( 1 . Materials Science and Engineering School , Inner Mongolia University of Science and Technology , Baotou 014010 , China; 2 . Inner Mongolia Key Laboratory of New Metal Materials , Baotou 014010 , China)
Abstract : An Al/Li-LDH film was prepared on the surface of Mg-5Li-1Al(LA51) magnesium alloy by hydrothermal synthesis method. The influence of the pH value of hydrothermal reaction on the morphology and properties of the Al/Li-LDH film was investigated by X- ray diffraction (XRD) , electrochemical impedance spectroscopy (EIS) testing , polarization curve and other characterization methods . The results show that the size of the Al/Li-LDH film increases as the the pH value of the hydrothermal reaction rises , and the corrosion resistance of the above-said film increases first and then decreases . When the pH value of hydrothermal reaction is 11 . 5 , the Al/Li- LDH film has the best corrosion resistance , including the largest charge transfer resistance Rct , the smallest corrosion current density Jcorr , and the smallest weight loss rate (0 . 1g/m2 ·a) .
Key words : Mg-Li alloy; LDH film ; reaction parameters; pH; the corrosion resistance