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Title:Localized dissolution kinetics of low carbon steel
Authors:Petek, Aljana (Author)
Doleček, Valter (Author)
Files:.pdf Acta_Chimica_Slovenica_2007_Petek,_Dole_Localized_Dissolution_Kinetics_of_Low_Carbon_Steel.pdf (105,67 KB)
MD5: F09EF8CE830FA5C30119384D7966F039
URL http://acta-arhiv.chem-soc.si/54/54-4-725.pdf
Work type:Scientific work (r2)
Typology:1.01 - Original Scientific Article
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:Localized dissolution of low carbon steel in saturated calcium hydroxide with different amount of sodium chloride has been investigated, using a dc technique. Potentiokinetic polarization curves indicated that pitting potentials ($E_{pit}$) decrease linearly with the log of chloride concentration. The rate of pit nucleation (1/$t_i$), and the rate of pits growth increases with increasing concentration of $Cl^-$ ions. Initiation of pitting attack could be ascribed to the adsorption of $Cl^-$ ions on the oxide surface. Adsorption of $Cl^-$ ions is physisorption and follow the Langmuir isotherm with $Δ_{ads}G^0$ = -21.1 kJ/mol.
Keywords:pitting corrosion, adsorption isotherm, low carbon steel, simulated interstitial solution
Year of publishing:2007
Number of pages:str. 725-729
Numbering:št. 4, Letn. 54
ISSN on article:1318-0207
COBISS_ID:11991318 New window
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Record is a part of a journal

Title:Acta Chimica Slovenica
Shortened title:Acta Chim. Slov.
Publisher:Slovensko kemijsko društvo
COBISS.SI-ID:14086149 New window


License:CC BY 4.0, Creative Commons Attribution 4.0 International
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:31.05.2012

Secondary language

Abstract:S pomočjo dc tehnike smo raziskovali lokalizirano raztapljanje malo-ogljičnega jekla v nasičeni raztopini kalcijevega hidroksida ob dodanih različnih množinah natrijevega klorida. Poteciokinetične polarizacijske krivulje so pokazale, da se kritični porušitveni potencial ($E_{pit}$) linearno zmanjšuje z logaritmom koncentracije kloridnih ionov. Hitrost nastajanja luknjic (1/$t_i$) in hitrost rasti luknjic se povečuje s povečanjem koncentracije $Cl^–$ ionov. Iniciacijo točkaste poškodbe lahko pripišemo adsorpciji $Cl^–$ ionov na oksidno površino. Adsorpcija $Cl^–$ je fizisorpcija in sledi Langmuirjevi adsorpcijski izotermi z $∆_{ads}G^0$ = –21.1 kJ/mol.
Keywords:točkasta korozija, adsorpcijska izoterma, nizkoogljična jekla


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