Influence of the amount of intermetallics on the degradation of Mg-Nd alloys under physiological conditions

The influence of amount intermetallics on the degradation as-extruded Mg-Nd alloys with different contents Nd was investigated via immersion testing in DMEM+10% FBS under cell culture conditions and subsequent microstructural characterizations. It is found that presence intermetallic particles Mg41Nd5 affects corrosion two conflicting ways. One their negative role existence enhances micro-galvanic corrosion. Another positive role. Their favours formation a continuous compact layer. At early stage immersion, predominated. rate monotonously increases increasing intermetallics. Mg-5Nd alloy maximum suffered from most severe With proceeding (?7 days), then these could not be neglected. Owing to interaction between roles, at later first content Nd, reaches 2 wt. % Nd. further increase content, decrease occurs. main products surfaces include carbonates, calcium-phosphate, neodymium oxide and/or hydroxide. They are amorphous immersion. proceeding, they transformed crystalline. undegradable layer can enhance crystallization such products.