8-hydroxyquinoline (8-HQ) intercalated layered double hydroxides (LDH) film as underlayer and sol–gel layer was combined for active corrosion protection of the AM60B magnesium alloy. The LDH, LDH/sol–gel, and LDH@HQ/sol–gel coatings were analyzed using the scanning electron microscopy (SEM), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), atomic force microscopy (AFM), and electrochemical impedance spectroscopy (EIS) methods. The SEM images showed that the surface was entirely coated by the LDH film composed of vertically-grown nanosheets. The same morphology was observed for the LDH/sol–gel and LDH@HQ/sol–gel coatings. Also, almost the same topography was observed for both composite coatings except that the LDH@HQ/sol–gel coating had relatively higher surface roughness. Although the LDH film had the same impedance behavior as the alloy sample in 3.5wt％ NaCl solution, its corrosion resistance was much higher, which could be due to its barrier properties as well as to the trap-ping of the chloride ions. Similar to the LDH film, the corrosion resistance of the LDH/sol–gel composite diminished with increasing the ex-posure time. However, its values were much higher than that of the LDH film, which was mainly related to the sealing of the solution path-ways. The LDH@HQ/sol–gel composite showed much better anti-corrosion properties than the LDH/sol–gel coating due to the adsorption of the 8-HQ on the damaged areas through the complexation.

Yahya Jafari Tarzanagh;Davod Seifzadeh;Roghaye Samadianfard

Applied Chemistry Department,University of Mohaghegh Ardabili,Ardabil 5619911367,Iran

矿物冶金与材料学报

[1]Yahya Jafari Tarzanagh;Davod Seifzadeh;Roghaye Samadianfard-.Combining the 8-hydroxyquinoline intercalated layered double hydroxide film and sol–gel coating for active corrosion protection of the magnesium alloy)[J].矿物冶金与材料学报,2022(03):536-546

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