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Kinetika pasivacije Cr-13 nerjavnih jekel : doktorska disertacijaFuchs-Godec, ReginaPreučevali smo kinetiko nastajanja pasivnega filma na nerjavnih jeklih iz serije PROKRON 1, 2 in 3 v mediju, ki je bila mešanica 0,1 M ▫$H_2SO_4$▫ in 0,1 M ▫$Na_2SO_4$▫, s pH-vrednostjo 2,42, 2,85 in ... 3,33 pri petih različnih anodnih potencialih (-0,1, 0,0, 0,1, 0,2 in0,3) V proti NKE. Z analizo eksperimentalnih podatkov dobljenih s potenciostatsko metodo smo potrdili, da so anodno raztapljanje, tvorba predpasivnega in nastajanje pasivnega filma difuzijsko kontrolirani procesi. Merjene vrednosti, ki opisujejo odvisnost toka od časa lahko opišemo z drugim Flickovim zakonom. Izračunana debelina difuzijski plasti, ki se pri pH=2,46 in 2,85 minimalno razlikuje, medtem, ko se pri pH=3,31 zmanjša za red velikosti nedvoumno kaže na razliko v procesih nastajanja pasivne plasti. Da bi bolje razumelu procese pri nastanku pasivne plasti, smo analizirali potek krivulje `i-t` v območju najhitrejšega spreminjanja te krivulje. Hitrost padca anodnega toka smo razložili na osnovi hitrosti nukleacije in rasti oksidnega filma, pri čemer smo uporabili modificirano Eforeevo enačbo. V skladu z objavljenimi literaturnimi podatki smo predpostavili, da pacivacijski proces, kadar ima raztopina pH=2,42 in 2,85, poteka v treh korakih (▫$\sigma = 3$▫). Prvi korak je nastanek predpasivnega filma, drugi korak pripisujemo pretvarjanju v pasivni film s strukturo hidroksida in hidroksioksida, tretji korak pa je končna pretvorba v oksidno obliko. V raztopini s pH=3,31 pa gre za direktno oksidacijo na površini elektrode, drugače povedano, proces se je v tem primeru izvršil v enem koraku (▫$\sigma = 1$▫). Vpeljali smo tudi alternativno metodo za določitev limitnega toka ▫i_d$▫, na podlagi potenciostatskih meritev. Rezultate za gostoto limitnega toka, dobljene iz prevojnih točk smo primerjaliz vrednostmi za gostoto toka, odčitanih iz polarizacijskih krivulj pri anodnem vrhu. Ujemanje vrednosti limitnega toka izračunanih po obeh metodah je zadovoljivo.Type of material - dissertation ; adult, seriousPublication and manufacture - Maribor : [R. Fuchs-Godec], 2001Language - slovenianCOBISS.SI-ID - 115882752
Author
Fuchs-Godec, Regina
Other authors
Doleček, Valter |
Petek, Aljana
Topics
Jeklo |
Pasivacija |
Kinetika |
Disertacije |
korozija |
PROKRON |
nerjavno jeklo |
pasivni filmi
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Fuchs-Godec, Regina | 08762 |
Doleček, Valter | 00869 |
Petek, Aljana | 08264 |
Source: Personal bibliographies
and: SICRIS
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