Evolution of unpredictable behaviour of a passivated stainless steel measured electrochemically
| Autor: | G.T. Burstein, A.R. Moshaweh |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Steady state 020209 energy General Chemical Engineering Passivity Metallurgy 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Electrocatalyst Electrochemistry Corrosion Cathodic protection Chemical physics 0202 electrical engineering electronic engineering information engineering General Materials Science 0210 nano-technology Current density Dissolution |
| Zdroj: | Corrosion Science. 113:126-132 |
| ISSN: | 0010-938X |
| DOI: | 10.1016/j.corsci.2016.10.013 |
| Popis: | We report here the very slow activation of a stainless steel measured by long-term constant-potential polarisation in acidic solution in a region where the net current is cathodic. This unexpected and unpredictable behaviour follows a period of time in which the metal appears to demonstrate an increasing state of passivity. The activation is observed as an increase in the cathodic current density arising from surface accumulation of electrocatalytic components, which accompanies the slow dissolution of the metal. The activation process takes a significant period of time to manifest itself, and then evolves very slowly: it does not reach a steady state even after several days of polarisation at constant potential. These unique observations introduce potential difficulties involved in long-term prediction of corrosion behaviour using short-term electrochemical measurements. |
| Databáze: | OpenAIRE |
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