Localized dissolution kinetics of low carbon steel
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 (Epit) decrease linearly with the log of chloride concentration. The rate of pit nucleation (1/ti), 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 ?adsG0 = -21.1 kJ/mol.
Keywords
točkasta korozija;adsorpcijska izoterma;nizkoogljična jekla;pitting corrosion;adsorption isotherm;low carbon steel;simulated interstitial solution;
Data
| Language: | English |
|---|---|
| Year of publishing: | 2007 |
| Typology: | 1.01 - Original Scientific Article |
| Organization: | UM FKKT - Faculty of Chemistry and Chemical Engineering |
| UDC: | 544.431 |
| COBISS: |
11991318
|
| ISSN: | 1318-0207 |
| Views: | 1911 |
| Downloads: | 85 |
| Average score: | 0 (0 votes) |
| Metadata: |
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Other data
| Secondary language: | Slovenian |
|---|---|
| Secondary 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. |
| Secondary keywords: | točkasta korozija;adsorpcijska izoterma;nizkoogljična jekla; |
| URN: | URN:NBN:SI |
| Type (COBISS): | Scientific work |
| Pages: | str. 725-729 |
| Volume: | ǂVol. ǂ54 |
| Issue: | ǂno. ǂ4 |
| Chronology: | 2007 |
| Keywords (UDC): | mathematics;natural sciences;naravoslovne vede;matematika;chemistry;crystallography;mineralogy;kemija;physical chemistry;fizikalna kemija;chemical kinetics;catalysis; |
| ID: | 1437552 |
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