Al7075 alloy Cu nano-layer LDH Mott-Schottky analysis PEO Research & information: general SBF SiO2 particle Taguchi method Technology: general issues active protection aluminium aluminum aluminum 6082 aluminum oxide anatase and rutile annealing anodized aluminum antibacterial properties apatite biodegradability biodegradable implants calcium-phosphate (CaP) coating corrosion corrosion resistance defect hydrophilic surface in vitro bioactivity in-vivo test luminescent coatings