Abstract
Corrosion inhibitors 2,5-pyridinedicarboxilate (PDC), sodium metavanadate (SMV) and 5-aminosalicylate (AS) were impregnated into porous PEO coatings respectively via vacuuming process, followed by fast sealing treatment in a Ce containing solution. After that layered double hydroxides (LDHs) based nanocontainers were respectively prepared on them via hydrothermal treatment. In frame of this work it was shown, that sealing effect for the pore was provided by formation of new phase CeO2 on the surface of PEO coatings. And, hydrothermal preparation for preparing LDHs leaded obvious changes in structure and thickness of the coatings. In addition, impregnation of inhibitors was in favor of improving LDHs content in final composite coatings. EIS result indicated that AS/Ce-HT specimen exhibited a best corrosion protection.
Highlights
Up to now, there is dispute about the anodic reaction of Mg corrosion, such as Song et al.[5] proposed a concept of anodic hydrogen evolution to describe hydrogen evolution associated with anodic dissolution
We reported an easy way to prepare MgAl-layered double hydroxides (LDHs) on anodic or plasma electrolytic oxidation (PEO) layer[47,48], followed by confirming the two primary internal sources of M g2+ and A l3+ cations for the formation of LDH coatings: degradation of the anodic or PEO layer and dissolution of the AZ31 substrate, and further a two-dimensional layer growth (2D) to three-dimensional (3D) growth model[49] was proposed
For obtaining MgAl-LDH coating on PEO layer, as-prepared PDC/Ce, sodium metavanadate (SMV)/Ce and AS/Ce specimens were hydrothermally treated in 0.1 M N aNO3 solution in a Teflon-lined stainless steel autoclave at 398 K for 16 h, respectively
Summary
Up to now, there is dispute about the anodic reaction of Mg corrosion, such as Song et al.[5] proposed a concept of anodic hydrogen evolution to describe hydrogen evolution associated with anodic dissolution. The pores in PEO layer of PDC, SMV and AS specimens were sealed in the aqueous solution containing 5 g/L Ce(NO3)[3] and 0.5 g/L H 2O2 at 90 °C for 10 min.
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