20.500.12556/DKUM-53113 Nucleation and growth of a passive film on AISI 420 martensitic stainless steel under potentiostatic conditions Zgodnja faza nastanka pasivne plasti na AISI 420 nerjavnem jeklu pod potenciostatičnimi pogoji The kinetics of the early stage s of passive film formation on AISI stainless stell in mixtures of 0.1M ▫$H_2SO_4$▫ and 0.1M ▫$Na_2SO_4$▫, with pH-values of 2.42, 2.85 and 3.33, were studied at different anodic potentials. The potentiostatic step method was used as an electrochemical technique in which the anodic current density was measured as a function of time. For analysis of the measured data, the theory of "topochemical reaction" was applied for the charcterization of the exponent n in that part where the steepest current decay was observed. Through this theory, which includes the Erofeev equation, the number of conversion steps could be obtained, as well as the number of directions in which the nuclei grow. It was found that this theory can be successfully applied to the passivation process of AISI 420 stainles steel. V prispevku smo obravnavali kinetiko pasivacije martenzitnega jekla AISI 420 v modelnem mediju. Kot korodirni medij smo izbrali mešanico raztopin 0,1 M $H_2SO_4$ in 0,1 M $Na_2SO_4$ različnih pH-vrednosti (2.42, 2.85 in 3.31). Študija je bila osredotočena na zgodnjo fazo nastanka pasivne plasti izbranega jekla. Uporabljena metoda za elektrokemijska merjenja je bila potenciostatska metoda, pri kateri smo merili tok kot funkcijo časa. Za analizo eksperimentalnih podatkov v področju najstrmejšega padca toka smo uporabili teorijo »topokemijskih reakcij«, ki vključuje Erofeevo enačbo. Dobljeni rezultati kažejo na dobro ujemanje z uporabljeno teorijo. corrosion corrision resistance martensitic stainless steels passive films potentiostatic step method topochemical reactions korozija korozijska odpornost martenzitna nerjavna jekla pasivni film potenciostatična koračna metoda topokemijske reakcije true false true Angleški jezik Slovenski jezik Znanstveno delo 2015-07-10 19:22:10 2015-07-10 19:22:10 2022-06-02 03:09:03 2021-05-10 03:34:00 2002 0 0 str. 139-148 št. 1 Letn. 49 mar. 2002 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1318-0207 620.193 14086149 6971158 1318-0207 URN:SI:UM:DK:SNKOLBLP Acta_Chimica_Slovenica_2002_Fuchs-Godec,_Petek,_Dolecek_Nucleation_and_growth_of_a_passive_film_on_AISI_420_martensitic_stainless_steel.pdf Acta_Chimica_Slovenica_2002_Fuchs-Godec,_Petek,_Dolecek_Nucleation_and_growth_of_a_passive_film_on_AISI_420_martensitic_stainless_steel.pdf 1 2FCF40AF5ABB0B46ECD6845F33B34B6F af582be360312023ebd840f74116dbebad421129877b4f393945ae9a99130ef5 8daaf1fe-7c0e-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=115895 http://acta-arhiv.chem-soc.si/49/49-1-139.pdf 1 https://dk.um.si/Dokument.php?lang=slv&id=77673 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0