Enhanced Corrosion Resistance and Biocompatibility of Magnesium Alloy by Mg–Al-Layered Double Hydroxide

Abstract

Magnesium (Mg) and its alloys have been suggested as revolutionary biodegradable materials. However, fast degradation hinders its clinic application. To improve the corrosion resistance and biocompatibility of Mg-Nd-Zn-Zr alloy (JDBM), magnesium-aluminum-layered double hydroxide (Mg-Al LDH) was successfully introduced into Mg(OH) coating by hydrothermal treatment. The anions in the interlayer of Mg-Al LDH can be replaced by chloride ions, resulting in a relatively low chloride ion concentration near the surface of the coating. The favorable corrosion resistance of the coating was proved by polarization curves and hydrogen collection test. The Mg-Al LDH significantly promoted cell adhesion, migration and proliferation in vitro. In addition, the coating almost fulfilled the request of the clinical application in the hemolysis ratio test. Finally, in vivo results indicated that the coating offered the greatest long-lasting protection from corrosion and triggered the mildest inflammation comparing to the pure Mg(OH) coatings and untreated magnesium alloy. Mg(OH) coating containing Mg-Al LDH in the present study shows a promising application in improving anticorrosion and biocompatibility of Mg alloys, and might act as a platform for a further modification of Mg alloys ascribed to its special layer structure.

Corrosion Motivated ROS Generation Helps Endow Titanium with Broad‐Spectrum Antibacterial Abilities

“…It is reported that Cl − has significant impacts on the cathodic reaction in the process of titanium corrosion . The prepared Mg–Fe LDHs can absorb Cl − ions, decreasing their concentration, the corrosion behavior of samples is thus affected. Figure b shows the relevant schematic illustration, based on the mixed potential theory.…”

Covalent Surface Functionalization of Bovine Serum Albumin to Magnesium Surface: Enhancing Robust Corrosion Inhibition and In vitro Osteo-Inductivity

“…The corrosion behavior of as-prepared samples was evaluated through the conventional immersion test method. The volume of hydrogen (H2) evolved at different point times was measured and the degradation rate ( ) was calculated at normal temperature and pressure (NTP) using the relation, (DR) = ( ), where 'P,V,R,T,M, A, and t' correspond to normal pressure at RT, volume of H2 evolved in mL, universal gas constant, RT in kelvin, molar mass of Mg, active surface area, and exposure time respectively [31]. The process was carried out at different time points to monitor the degradation of magnesium.…”

Carbon supported manganese(IV)–cobalt(II/III) oxides nanoparticles for high-performance electrochemical supercapacitors

“…In order to improve the capacitive performance of TMOs nanostructured electrode material with various morphologies that have a high specific surface area and a large surfaceto-volume ratio for more effective contact with electrolyte ions, such as mesoporous MnO 2 nanotubes/nanosheets [18], nanowires [19] or flowerlike, urchin-like and nanorod-like structures [20] or ultra-small Co 3 O 4 nanocubes [21], hollow coral-shaped nanostructures [12] or nanosheets [22] have been created. Incorporation of foreign conductive metals including Au, Al, Cu, Fe, Mg and Co [23][24][25][26][27][28][29][30] into TMOs lattices has been successfully applied and revealed the increase in C s , for example, in the presence of Co the achieved C s value was of 350 F g −1 at a current density of 0.1 A g −1 [29]. Analogously, creating binary, ternary or multy-mixed TMOs allowed improving the capacitive performance of those electrode materials, compared to that of the single metal compounds [31][32][33][34][35].…”