Surface characteristics and corrosion resistance of sol–gel derived CaO–P2O5–SrO–Na2O bioglass–ceramic coated Mg alloy by different heat-treatment temperatures

Influence of the annealing temperature and metal salt precursor on the structural characteristics and anti-corrosion barrier effect of CeO2 sol–gel protective coatings of carbon steel

“…Conversely, for the coatings with more crystallized phases, the tensile stress could not be effectively released, resulting in more cracks. Thus, the in-plane residual stress derived from crystalline transformation acts as a main factor in the corrosion behavior, leading to differences of protective ability in electrochemical tests [35]. These findings corroborate our results, since the more crystalline coatings (synthesized at high temperature) yielded lower anticorrosive protection ( Figs.…”

“…Moreover, it is also clear that the coatings have a more amorphous character when heat treated at low temperatures and that the crystalline character slightly increases with increase in the treatment temperature. In this sense, it was demonstrated that the softening of amorphous phase benefits the reduction of both tensile stress and the crack formation driving force and ensures good coherence with the substrate [33,35], thus hindering the penetration of corrosive ions, so providing effective protection for Mg alloy. Conversely, for the coatings with more crystallized phases, the tensile stress could not be effectively released, resulting in more cracks.…”

Control of degradation rate of Mg alloys using silica sol–gel coatings for biodegradable implant materials

“…One important is based in the deposition of bioactive glass or glass-ceramic sol-gel coatings such as Bioglass 45S57, 58S, etc. [16][17][18][19]. These materials react with the physiological fluid for obtaining an adequate interfacial bonding with bone by forming a hydroxyapatite layer (HA).…”