Susceptibility to Localized Corrosion of ASTM F745 and UNS S32750 Stainless Steels Influence of pH and Cytotoxicity Evaluation

GREGORUTTI, RICARDO W.; PARISI, JULIETA; CASTROGIOVANNI, DANIEL; ELSNER, CECILIA I.; GRAU, JORGE E.; REIGOSA, MIGUEL

Innovations in Corrosion and Materials Science (Formerly Recent Patents on Corrosion Science)

Bentham Science Publishers

Año: 2020 vol. 10 p. 47 - 57

2352-0949

Body fluids are highly corrosive as they contain chlorides and hydroxidesions, as well as salts, bacteria, proteins and dissolved oxygen. The pH of the body is usually around7.4, although this value can vary in a range of 4 to 9 after surgery or because of haematomas, inflammations and infections. ASTM F745 (type 316L) stainless steel has been used for load bearing partialand total joint replacements and post trauma reconstructive surgeries. However, long exposure to theaggressive effect of chloride ion present in the human body, may increase the susceptibility to sufferlocalized corrosion. Although UNS S32750 has greater corrosion resistance to chloride ion, its magnetic characteristics inhibit its use in implantable devices. Nevertheless, this stainless steel could be usedin temporary implants and orthodontic appliances such as brackets, wire arches and bands, due to its highresistance to corrosion, the greater mechanical resistance and the high capacity of plastic forming.