Design of multilayer hybrid sol-gel coatings with bifunctional barrier-bioactive response on the Elektron 21 magnesium alloy for biomedical applications

Cerium conversion coating and sol-gel coating for corrosion protection of the WE43 Mg alloy

“…The samples were then cured at 150 • C for 1 h. In the hybrid coating structure, the full hydrolysis of the inorganic precursor (TEOS) results in a Si atom linked to four OH groups (silanol), whereas the full hydrolysis of the organic precursor (GPTMS) results in the central Si atom bound to three hydroxyl (silanol groups) and to the glycidoxypropyl group (not hydrolyzed), thus introducing an organic molecule in the coating structure. The hydrolyzed TEOS provides adhesion to the metallic substrate and high corrosion resistance [58], this latter due to the crosslinking of the silanol groups. However, its intrinsic inorganic nature introduces defects in the coating structure (it is brittle) and the curing temperature for cross-linking is too high to be used with Mg alloys [59].…”

Corrosion Behavior in Magnesium-Based Alloys for Biomedical Applications

“…Besides the corrosion resistance and the biocompatibility, the bio-functional property has raised a great deal of concern in recent years. By means of introducing specific ions, ceramics, compounds, proteins, etc., or loading commercial drugs on surface coatings, the design of complex and composite coatings has been stimulated [ 283 , 284 , 285 , 286 , 287 ]. For instance, Fe 3 O 4 –HA–chitosan coatings can be prepared by electrophoretic deposition, which displays a superior antimicrobial efficacy than HA coating since Fe 2+ can induce the generation of H 2 O 2 , damaging the DNA and proteins in bacteria [ 288 ].…”

Electrochemical evaluation of AZ31 Mg alloy in corrosion protection of titanium silicon oxide from Earle's solution

“…[3][4][5] The mechanical properties (Young's modulus 44 GPa and density 1.74 g cm À3 ) of Mg alloys are identical to human bone compared to other biodegradable materials such as Fe and Zn-based alloys. 6,7 The superior properties of Mg alloys are bioresorbability, biocompatibility, nontoxicity and non-rejection of revision surgery of the implant. 8 Furthermore, Mg ions are present in all living cells and 50% of the ions are present in bone.…”