Cerium-based coating for enhancing the corrosion resistance of bio-degradable Mg implants

Evaluation of biodegradability of surface treated AZ91 magnesium alloy in SBF solution

“…poly- 16 lactides have an unsatisfactory mechanical property [4]. In 17 comparison to the conventional implants, magnesium (Mg) and 18 its alloys can act as good candidates for biodegradable implants 19 due to their following attractive biological performances: (1) 20 biodegradable in body fluids [5] and forms soluble and non-toxic 21 oxide which is excreted out in the urine [6], (2) harmless [7], (3) 22 accelerate the growth of new bone tissue [8], (4) the mechanical 23 properties like density, elastic modulus and yield strength of Mg 24 are closer to the bone [9], (5) light weight [10] and (6) essential for 25 human metabolism and naturally found in bone tissue [11]. 26 Moreover, the bioabsorbable Mg implants might provide a remedy 27 for a number of problems associated with permanent metallic 28 implants such as physical/mechanical irritation, inability to adapt 29 bone in growth and other ongoing shape changes in the human 30 body.…”

“…In the past years, some surface modification 56 methods have been developed for the corrosion protection of AZ91 57 Mg alloy, which include alloying with electrochemical treatment 58 (anodic oxidation), conversion coating, thermal oxidation, employ-59 ing alkali-heat-treatment, chemical treatment (alkali and acid 60 treatment), alkyl based coatings, microarc oxidation, cathodic arc 61 deposition of oxide, and use of composites etc. which have been 62 devoted to impart the desired surface properties without affecting 63 the properties of the AZ91 Mg alloy [18][19][20][21][22][23][24][25]. 64…”

Biocorrosion behavior and cytotoxicity of a Mg–Gd–Zn–Zr alloy with long period stacking ordered structure

“…The tensile test was conducted at room temperature with a strain rate of 1.7 Â 10 À 3 s À 1 . Biocorrosion resistance of the alloy was evaluated in Hanks' solution [9] by hydrogen evolution experiment. The details of the hydrogen evolution test can be referred to Ref.…”

Microstructure, mechanical property and corrosion behaviors of interpenetrating C/Mg-Zn-Mn composite fabricated by suction casting

“…Therefore, it is important to improve the corrosion resistance of Mg alloys in order to enlarge their application field. Recently, many methods, such as element alloying [14,15,18], surface modification [19,20] and design of composite materials [21][22][23][24], have been used to improve the corrosion resistance of Mg alloys. Although the element alloying can increase the bio-corrosion resistance of Mg alloys to some extent, it cannot significantly improve the bone response to Mg alloys, especially the bone response at the early stage [15].…”

“…Although the element alloying can increase the bio-corrosion resistance of Mg alloys to some extent, it cannot significantly improve the bone response to Mg alloys, especially the bone response at the early stage [15]. Some coating can provide the Mg alloy with a significantly better surface cytocompatibility and improved osteoconductivity and osteogenesis in the early postoperation period, but combination of coating and matrix alloy is poor [19,20]. Biocomposite materials can be designed to obtain a wide range of mechanical and biological properties [25].…”