342 KB28 KB200020242014Donik, ČrtomirKocijan, Aleksandraletnik:48številka:6str. 937-942COBISSID:1106090ISSN:1580-2949URN:URN:NBN:SI:doc-7DDADH3EenInštitut za kovinske materiale in tehnologijeMateriali in tehnologijeEISnerjavno jeklopasivacijapassivitypotenciodinamske meritvepotentiodynamic measurementsstainless steelXPSComparison of the corrosion behaviour of austenitic stainless steel in seawater and in a 3.5 % NaCl solution| Primerjava korozijskih lastnosti avstenitnih nerjavnih jekel v morski vodi in raztopini s 3,5 % NaCl|The evolution of the passive films on austenitic AISI 316L stainless steel in seawater and in pure 3.5 % NaCl was studied using potentiodynamic (PD) measurements, X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS). This paper describes and evaluates the comparison of pure 3.5 % NaCl with seawater through surface and corrosion measurements. The formation of the passive film was studied by EIS at the open-circuit potential (OCP), by potentiodynamic measurements and by X-ray photoelectron spectroscopy, where their compositions were analysed as a function of depth, and the cationic fraction of the passive film was determined. The passive films on both materials predominantly contained Cr-oxides, whereas the Fe species were markedly depletedZ različnimi tehnikami: z rentgensko fotoelektronsko spektroskopijo (XPS), potenciodinamskimi meritvami (PD) in elektrokemijsko impedančno spektroskopijo (EIS), smo preučevali rast pasivnih plasti na avstenitnem nerjavnem jeklu AISI 316L v korozijskih medijih: v raztopini 3,5 % NaCl in v morski vodi. Pri EIS-tehniki smo merili tvorbo plasti pri potencialu odprtega kroga (OCP), XPS smo uporabili za analizo tvorjenih plasti na površini v odvisnosti od debeline, medtem ko smo s potenciodinamskimi meritvami preizkusili osnovne elektrokemijske lastnosti materiala po izpostavitvi v izbranih medijih. Pasivna plast je pri obeh materialih sestavljena iz kromovih oksidov, ki tudi preprečujejo nadaljnjo degradacijo materiala v kloridnem medijuTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije