Fizikalno-kemijska svojstva pasivnog sloja na žicama vodilicama u endourologiji

The main criterion for austenitic steel X2CrNiMo 17-12-2 suitability for guide wire in endourology is its biotolerance. It is most of all connected with physical and chemical properties of wire surface, which should be adjusted to the characteristics of the environment of human urinary system tissues. Suitability of the proposed passive layer for purification of wire surface was determined to a great extent by its chemical composition. Therefore, this study included chemical composition tests by means of X-ray Photoelectron Spectroscopy (XPS), during which atomic concentration of elements in tested passive layers was identified and determined. Resistance to pitting corrosion was evaluated on the ground registered anodic polarisation curves by means of potentiodynamic method.Glavni kriterij za primjenu austenitnog Cr-Ni-Mo čelika za žice vodilice u endourologiji je biotolerancija. Ovaj zahtjev ovisi o fizikalnim i kemijskim svojstvima površine žice, koja moraju biti prilagođena uvjetima koji vladaju u ljudskom urinarnom sustavu. Pogodnost predloženog pasivnog sloja za žicu vodilicu, prvenstveno ovisi o njegovom kemijskom sastavu. Stoga, istraživanje u ovom radu obuhvaća određivanje kemijskog sastava pasivnog sloja žice metodom fotoelektronske rendgentske spektroskopije (XPS). Otpornost na jamičastu koroziju određena je korištenjem potenciodinamičke polarizacije, snimanjem anodnih polarizacijskih krivulja